Connection structure of helmet

Abstract

The present invention discloses a connecting structure of a helmet, including a helmet body; a face guard and a chin shield are symmetrically hinged on both sides of the helmet body by a face guard rotating component and a chin shield rotating component, respectively; mounting grooves are symmetrically provided on both sides of the helmet body, wherein a face guard rotation limiting member and a rotating component mounting plate are mounted in the mounting groove; a face guard mounting member in the face guard rotating component is mounted inside the rotating component mounting plate; the face guard is connected to a linkage guide ring member of the chin shield via the face guard mounting member; the vicinity of the other end of the linkage guide ring member is hinged to the rotating component mounting plate via a first rotary shaft; a driving block cooperating with the inner side of an annular groove is provided in the annular groove on the linkage guide ring member; the driving block passes through the rotating component mounting plate via a second rotary shaft and is connected to a chin shield rotating component provided on the outer side of the rotating component mounting plate; and the chin shield rotating component is connected to the rotating component mounting plate and the chin shield, respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of personal safety protector, which relates to a helmet for protecting the head of a human body, particularly to a helmet having a jaw-protecting structure, and more particularly to a chin shield which can be rotated from a chin portion of the helmet to a rear portion of the helmet, and a chin shield connecting structure of the helmet which can be rotated in association with a face guard.Bakground Art

[0002] It is well known that the users of various motor vehicles, racing cars, racing boats, balancing cars, aircrafts and even riding bicycles should wear helmets to protect the safety of their heads during the process of handling the implement. In addition, in many special work situations, such as those working in spray booths, fire relief, anti-terrorism, and harsh environments such as mining, coal mining, tunneling, etc., they also need to wear helmets to protect their heads from all kinds of accidental injuries. At present, the helmet mainly includes a full-helmet structure type helmet and a half-helmet structure type helmet. Here, the full-helmet structure type helmet is provided with a jaw guard for embracing the chin of a user, and the half-helmet structure type helmet is not provided with the jaw guard. In the full-helmet structure type helmet, as it has the chin protecting structure, it can play a better safety protection function to the wearer's head. For the half-helmet structure type helmet, the wearer's mouth, nose and other organs do not have the constraints of the jaw guard, and therefore, it is more comfortable to use.

[0003] Conventional full-helmet type helmets are manufactured in such a way that the chin protector and the helmet shell body are of one-piece construction, i.e., the chin protector is of a relatively immovable structural configuration with respect to the helmet shell body. Undoubtedly, a conventional full-helmet type helmet of such a one-piece structure is strong and firm, and therefore it has a sufficient safety protection effect for the wearer. On the other hand, however, the full-helmet type helmets of one-piece structure suffer from the following drawbacks. Firstly, from the point of view of use, when the wearer needs to perform activities such as drinking, talking, resting, etc., he must remove the helmet first to complete the corresponding action. Needless to say, the performance of the traditional full-helmet with the one-piece structure is relatively sluggish and inconvenient. Secondly, from the point of view of production, the production efficiency of the one-piece structure type full helmet is not high because of the complexity of the mold due to the structural features of the large inner cavity and the small gap, which is the reason for the high cost of manufacturing the one-piece structure type helmet.

[0004] Clearly, the conventional one-piece full-helmet structure helmets fail to meet the multi-objective requirements of safety, convenience, low cost, etc. In view of this, the development of a helmet which combines the advantages of the safety of the full-helmet structure and the convenience of the half-helmet structure, has naturally become the goal of the current helmet researchers and manufacturers.

[0005] Chinese patent application CN105901820A proposes "a variable jaw guard structure type helmet based on gear constraint". According to the greatest feature of the present invention, a fixed internal gear of a cylindrical gear type is respectively arranged on both sides of the helmet shell body; two rotating external gears of a cylindrical gear type are respectively fixedly arranged on two fork handles of the jaw guard in an alternating manner, and corresponding arc-shaped constraint grooves are provided on a bottom bracket fixedly connected to the helmet shell body; the rotating external gear and the fixed internal gear are restricted by the constraint grooves so as to be kept in mesh and constitute a kinematic pair, thereby implementing the constraint required by a predetermined process on the position and attitude of the jaw protection, and finally achieving that the jaw protection runs according to a planned trajectory between the positions of the full-helmet structure and the positions of the half-helmet structure and can reversely convert to each other. In other words, the chin protector may be opened from the full-helmet structure position to the half helmet-helmet structure position, and vice versa, as desired. Meanwhile, since the jaw guard and the helmet shell body are no longer of a one-piece construction type, the mold for manufacturing the helmet is made simpler, so that the manufacturing cost can be reduced and the production efficiency can be improved. It will be apparent that the gear-constrained variable jaw guard stricture design of the above-mentioned patent application addresses the multi-objective need for safety, convenience, and low cost, thereby driving the advancement of helmet technology.

[0006] However, although the helmet with a variable jaw guard structure proposed in Chinese patent application CN105901820A has self-evident advantages. However, it also brings a number of disadvantages since it needs to adopt a long-length arc-shaped constraint groove with penetrating characteristics to maintain the meshing relationship between the rotating external gear and the fixed internal gear, and the rotating external gear follows the jaw guard to make a large-amplitude swinging motion. The specific disadvantages are as follows. 1) The longer and arc-shaped constraint groove makes the reliability of the helmet a problem, because when the jaw guard forms a so-called uncovering helmet in the process of changing the posture of the chin protector, especially when the chin protector is in an intermediate position between a full-helmet structure and a half-helmet structure (in this case, the helmet is in the form of a "quasi-half-helmet structure helmet". This state is particularly suitable for tunnel operations because it facilitates the wearer to drink water, talk, and temporarily breathe and also the chin protector cannot completely cover the constraint groove. That is, the body of the jaw guard cannot effectively cover the long arc-shaped constraint groove. As a result, an opportunity is created for foreign matter to enter the meshing kinematic pair consisting of the rotating external gear and the fixed internal gear. Once this happens, the gear restraint pair will easily get stuck. In other words, there is a certain hidden danger in the reliability of the helmet during its use. 2) The presence of the longer and arc-shaped constraint grooves also makes the helmet noisier. Also, as it is necessary for the jaw protector to be in an intermediate position between the full and half-helmet structures during the process of changing the posture of the jaw protector to constitute a so-called uncovering helmet, it is difficult for the rider to completely cover the constraint grooves because the jaw protector does not completely cover the constraint grooves, so that the squeaking sound generated by the external airflow passing through the outer surface of the helmet can be easily transmitted from the through-shaped constraint grooves into the interior of the helmet, and it is noted that these constraint grooves are arranged just near the ears of the wearer. Therefore, the sound insulation effect of the helmet is poor or its comfort is poor. 3) The safety of the helmet is weakened to some extent due to the planetary rotation of the external gear arrangement and the running form, because when the structure position of the jaw guard is changed, the external gear moves with the jaw protector and presents a planetary rotation behavior. It is not difficult to find that the space area swept by the external gear is relatively large, and it is obviously impossible to arrange the fastening screw or other fastening structure for the space area passed by the external gear rotation. At this time, the bottom bracket provided with the long-arc constraint groove will be forced to be arranged as a thin shell-shaped member with a relatively large span. It is well known that the inherent rigidity of the member in this structure form is relatively small. That means that the rigidity of the shell body of the helmet is weak. In other words, the safety of the helmet is impaired.

[0007] In addition, Chinese patent CN 210124365 U discloses a variable jaw-protection helmet with a gear constraint type, including a helmet shell body, a jaw protector and a fork handle on the jaw guard, wherein a bottom bracket, a fork handle, an internal gear, an external gear and a transmission member are used to form an association mechanism, wherein the internal gear and the external gear rotate on a fixed axis and form an engagement constraint pair; the internal gear and the fork handle are slidingly fitted with each other and form a sliding constraint pair, and the transmission member transmits the movement of the external gear to the fork handle and urges the jaw protector to produce a telescopic displacement relative to the helmet shell body, thereby achieving a turning movement of the jaw guard and a reciprocating movement at the same time. Thus, the position and posture of the jaw protector can be changed between the full-helmet position and the half-helmet position. Since the fork handle can cover the through groove on the internal gear in the process of turning the jaw protector, the external foreign matter can be avoided from entering into the gear pair to ensure the reliability of the helmet, and the external noise can be blocked from entering into the helmet to improve the comfort of the helmet. The less space occupied by the gears rotating on the fixed axis also creates the conditions for improving the rigidity of relevant components. Thus, the safety of the helmet is also improved. However, the structure of the helmet is very complicated, i.e., it is not easy to manufacture and use, and it is heavy, high in manufacturing cost, short in service life, and vulnerable to damage.

[0008] Chinese patent CN111264968A also discloses a chin guard positioning assembly and a helmet having the same. The chin guard positioning assembly covers a helmet body part for the head of a user and is connected to a chin guard. The chin guard moves from a protected position to an open position or moves from the open position to the protected position. The chin guard positioning assembly includes: a moving base portion connected to the chin guard and capable of moving in position with the chin guard; a fixed base portion connected to the helmet body part and connected to the moving base portion, and serving as a reference for the position movement of the moving base portion; a fixed magnetic portion fixed to the fixed base portion; and a moving magnetic portion that is fixed to the moving base portion in magnetic interaction with the fixed magnetic portion such that the moving base portion is fixed in the first position or the second position. The helmet also has problems in that it has a complicated structure, is inconvenient to manufacture and use, and is heavy. It has a high manufacturing cost and a short service life, and is vulnerable to damage.

[0009] In view of the above, there is still room for further improvement in the existing variable jaw guard structure type helmet.Summary of the Invention

[0010] It is an object of the present invention to overcome the disadvantages of the prior art by providing a simple structure, a small number of parts, a simple manufacture, a convenient use, a long service life, and a light weight of the helmet as a whole, so as to achieve a connecting structure for rotating a chin shield on a helmet in which the chin shield and a face guard are linked.

[0011] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution. A connecting structure of a helmet includes a helmet body; a face guard and a chin shield are symmetrically hinged on both sides of the helmet body by a face guard rotating component and a chin shield rotating component, respectively; mounting grooves are symmetrically provided on both sides of the helmet body, wherein a face guard rotation limiting member and a rotating component mounting plate are mounted in the mounting groove; a face guard mounting member in the face guard rotating component is mounted inside the rotating component mounting plate; the face guard is connected to an end of a linkage guide ring member via the face guard mounting member; the vicinity of the other end of the linkage guide ring member is hinged to the rotating component mounting plate via a first rotary shaft; a driving block cooperating with the inner side of an annular groove is provided in the annular groove on the linkage guide ring member; the driving block passes through the rotating component mounting plate via a second rotary shaft and is connected to a chin shield rotating component provided on the outer side of the rotating component mounting plate; and the chin shield rotating component is connected to the rotating component mounting plate and the chin shield, respectively. The cooperation of the linkage guide ring member with the driving block enables linkage of the chin shield with the face guard, and independent rotation of the face guard.

[0012] In order to facilitate hiding the face guard rotating component and the chin shield rotating component inside the helmet body so as not to be damaged, and also to achieve an aesthetic appearance effect, the preferred technical solution is that the mounting grooves are symmetrically provided at both sides of the helmet body, and are respectively provided as inwardly recessed grooves, the grooves being of a two-layer stepped groove structure. The grooves are provided as a stepped structure because the linkage guide ring member mounted in the grooves and the face guard rotation limiting member are components of a two-layer structure; the two-layer grooves include a mounting groove of a face guard rotation limiting member located at a second layer and a mounting groove of a rotating component mounting plate located at a first layer, respectively; the shape of the face guard rotation limiting member mounting groove is adapted to the shape of the face guard rotation limiting member; and the shape of the rotating component mounting plate mounting groove is adapted to the shape of the rotating component mounting plate.

[0013] In order to effectively limit the rotation range of the face guard and also enable the face guard not to automatically slide down after rotating to a predetermined position, or cause the face guard to swing up and down due to vibration and jerk of the helmet body when the helmet is worn, the preferred technical solution is that the face guard rotation limiting member includes a strip-shaped sliding block and a strip-shaped rod; wherein the vicinity of both ends of the strip-shaped rod is connected to the mounting groove via a fastener; one side of the strip-shaped rod is connected to the strip-shaped sliding block via an elastic member; one side of the strip-shaped sliding block is provided with an arc-shaped groove for positioning the face guard; a plurality of segments of arc-shaped grooves with different curvature radii are provided on the arc-shaped groove to constitute a toothed arc-shaped limiting guide groove; the strip-shaped rod and the strip-shaped sliding block are a shell structure, respectively; and one side of the cavity of the strip-shaped rod and the strip-shaped sliding block faces towards the mounting groove. This configuration is intended to limit the face guard to stay in any position without slipping off automatically or because of the jounce of the helmet. Since the face guard is mounted on the face guard mounting member, the face guard mounting member and the linkage guide ring member are connected together; a columnar projection is provided on a side of the linkage guide ring member; the columnar projection is clamped on a plurality of arc-shaped grooves with different curvature radii of the strip-shaped sliding block; when the face guard moves up and down to different positions, it is clamped on the plurality of arc-shaped grooves with different curvature radii of the strip-shaped sliding block by the columnar projection. The strip-shaped sliding block can bear against the columnar projection under the elastic force of the spring, and the bearing against the columnar projection also defines the rotation mounted on the face guard mounting member, i.e., defines the rotation of the face guard. The spring force of the single spring does not limit the rotation of the hand pushing the face guard.

[0014] In order to facilitate the connection of the face guard and the linkage guide ring member together, and also facilitate the composition of simplifying the installation operation, the preferred technical solution is that the linkage guide ring member has a C-shaped open ring-shaped structure; one end of the linkage guide ring member with the C-shaped open ring-shaped structure is connected to the face guard mounting member; a side columnar projection facing towards the mounting groove is provided near the connection part, and the columnar projection cooperates with the arc-shaped groove to form a limit for the face guard; a first mounting hole of the first rotary shaft is provided near the other end of the C-shaped open ring-shaped linkage guide ring member; a second mounting hole of the first rotary shaft is provided on the rotating component mounting plate; and the first rotary shaft mounts the linkage guide ring member and the face guard mounting member on the rotating component mounting plate via the first mounting hole, the second mounting hole and the fastener, and enables the linkage guide ring member and the face guard mounting member to rotate on the rotating component mounting plate around the first rotary shaft. The first rotary shaft is a component about which the linkage guide ring member and the face guard mounting member rotate. The linkage guide ring member and the face guard mounting member are rotated under the drive of the driving block. When the chin shield is pushed to rotate by hand, the chin shield drives the driving gear to rotate, and the driving gear drives the driving block to rotate. The triangular shape of the driving block presses the inner side of the C-shaped split ring of the linkage guide ring member to drive the rotation of the linkage guide ring member. Since the inner side of the C-shaped split ring of the linkage guide ring member has different curved surface sections, the chin shield and the face guard can be linked together, or the face guard can be rotated separately.

[0015] In order to minimize the structural size of the linkage guide ring member, reduce the weight of the linkage guide ring member, facilitate the connection between the linkage guide ring member and the rotating component mounting plate, and facilitate the face guard rotating around the second rotary shaft to stay at a predetermined position without slipping off, a preferred technical solution is also that the face guard mounting member has a strip-like arc-shaped surface structure; one side of an outer arc-shaped surface of the strip-like arc-shaped surface is adapted to be connected to the face guard, and a side of the inner arc-shaped surface of the strip-like arc-shaped surface is adapted to be connected to the linkage guide ring member; or the face guard mounting member and the linkage guide ring member form an integral structure; and the strip-like arc-shaped surface being provided with slots and / or raised edges on a side of the outer arc-shaped surface adapted to be connected to the face guard, and the width of the strip-like arc-shaped surface is greater than the width of the linkage guide ring member.

[0016] In order to facilitate driving the linkage guide ring member to rotate around the second rotary shaft and certainly drives the face guard to rotate together by the chin shield and the chin shield rotating component driving the driving block together, the preferred technical solution is also that the driving block is in the form of a triangular plate-like body having a through hole at the center thereof; and a convex tooth is provided at the periphery of the through hole at a side of the triangular plate-like body facing towards the rotating component mounting plate; and the convex tooth is used to be inserted into a groove on the other side annular surface of the driving gear, so that the driving gear drives the driving block to rotate together.

[0017] In order to facilitate guiding and defining the movement track of the driving block, facilitate mounting the chin shield rotating component on the rotating component mounting plate, and also minimize the structural size and weight of the rotating component mounting plate, a further preferred technical solution is that the rotating component mounting plate has a D-shaped shell structure, and the rotating component mounting plate is made into a D-shaped shell structure, mainly in order to enable one side of the rotating component mounting plate to accommodate the linkage guide ring member and the face guard mounting member, and the other side to facilitate linking with the chin shield. A side of the D-shaped shell structure facing towards the mounting groove is provided with a turnup. The function of the turnup is to form a cavity for accommodating the installation of the linkage guide ring member and the driving block between the rotating component mounting plate and the second mounting groove of the helmet body; wherein the turnup at one side of the vertical straight edge of the D-shaped shell structure is a stepped turnup, and the stepped turnup is used for guiding the rotation of the face guard mounting member; a C-shaped guide groove is provided on the rotating component mounting plate of the D-shaped shell structure; a through hole for the second rotary shaft to pass through is provided on the D-shaped shell in the surrounding of the C-shaped guide groove; and a mounting hole is further provided on the rotating component mounting plate of the D-shaped shell structure, wherein the mounting hole is used for mounting the rotating component mounting plate on the helmet body by using a screw, and the rotating component mounting plate is fixedly mounted on the mounting groove by the mounting hole using a fastener.

[0018] In order to facilitate guiding and defining the movement track of the driving block, facilitate mounting the chin shield rotating component on the rotating component mounting plate, and also minimize the structural size and weight of the rotating component mounting plate, a further preferred technical solution is that the chin shield rotating component includes a driving gear; the driving gear is meshed with a driven gear; the driven gear is fixedly mounted near one end of the C-shaped guide groove via a fixed shaft; the center of the driving gear is provided with a stepped hole cooperating with a second rotary shaft; the second rotary shaft is a hollow shaft for facilitating the passage of a fixing screw from the center of the hollow shaft. The function of the hollow shaft is to make the driving gear rotate on the hollow shaft and rub against the outer surface of the hollow shaft, but do not rub against the fixing screw to cause the fixing screw to loosen. One end of the second rotary shaft is provided with an end cap cooperating with the stepped hole, and the end cap is used for cooperating with the screw cap; the other end of the second rotary shaft is provided with a radial slot, wherein the radial slot is a clamping groove for cooperating with a projection on a boss in a mounting groove on the helmet, and is a structure for preventing the second shaft from rotating; the other end of the second rotary shaft passes through the stepped hole and a through hole on the driving block and cooperates with a projection provided on a boss in the mounting groove; and the hollow shaft of the second rotary shaft is connected to the mounting hole on the boss via a fastener. The driving gear is provided with an insert-connection slot of the chin shield into the ring surface between the driving teeth and the stepped hole. The insert-connection slot is used for inserting the insert-connection teeth protruding on the inner side of the chin shield. The connecting hole is used for fixing the chin guard to the driving gear with a screw so that the driving gear can be rotated when the chin shield is rotated. The driving gear is provided with a groove for engaging with the convex teeth on the driving block on the other ring surface between the driving teeth and the stepped hole. Since the chin shield is mounted to the side of the driving gear, when the chin shield is pushed to rotate, the driving gear will rotate about the second rotary shaft. Also, the driving gear meshes with the driven gear, which is mounted to the rotating component mounting plate via the fixed shaft, the rotating component mounting plate being mounted to the helmet body. The gear transmission structure is used in order to allow the chin shield to rotate more smoothly and to extend the service life.

[0019] In order to facilitate guiding and defining the movement track of the driving block, facilitate mounting the chin shield rotating component on the rotating component mounting plate, and also, in order to minimize the structural size and weight of the rotating component mounting plate, a further preferred technical solution is that the driving gear is an incomplete gear; since the rotation range of the chin shield is about 250 degrees, it is not necessary for the driving gear to be a complete gear; the incomplete gear is provided with a projection on an annular surface without teeth, a radial positioning groove is provided on the projection, and this positioning groove is used for limiting that the rotation of the chin shield is stopped after rotating to a certain position; a side projection protruding from the driving gear is provided on a side of the projection facing towards the rotating component mounting plate; the projection is in sliding fit with the C-shaped guide groove, and the projection is used for guiding the driving gear to rotate along the range of the C-shaped guide groove, and can ensure the smooth engagement between the driving gear and the driven gear; the radial positioning groove cooperates with a radial positioning sliding block, the radial positioning groove on the driving gear cooperates with the radial positioning sliding block, and the radial positioning sliding block and the radial positioning sliding groove mutually slidingly cooperate. That is to say, after the radial positioning groove on the driving gear rotates to the position where the radial positioning sliding block is located, the radial positioning groove will be caught by the radial positioning sliding block and cannot continue to rotate any more, and the radial positioning sliding block and the radial positioning sliding groove mutually slidingly cooperate. The radial positioning sliding block is an elongated sliding block, the upper end is used for limiting the rotation of the driving gear, and the radial positioning sliding groove slides in the radial positioning sliding groove below, and the radial positioning sliding groove is a U-shaped member. The radial positioning sliding groove is mounted on the inner side of the rotating component mounting plate by means of a fastener. One end of the radial positioning sliding block passes through the rotating component mounting plate and is located on the outer side of the rotating component mounting plate. An elastic member is provided between the radial positioning sliding block and the radial positioning sliding groove.

[0020] In order to facilitate the connection of the chin shield with the chin shield rotating component and also the connection of the chin shield rotating component with the driving block, and meanwhile to minimize the structural size of the chin shield mounting component and to reduce the weight of the chin shield mounting component, a further preferred technical solution is that a side of the chin shield facing towards the driving gear is provided with an insert-connection tooth adapted to the insert-connection slot; the chin shield is further provided with a mounting hole corresponding to the connecting hole; and a fastener is mounted in the connecting hole and the mounting hole (screw).

[0021] Compared to the prior art, the advantageous effects of the present invention are that the connecting structure of the rotating chin shield on the helmet has the characteristics of simple structure, small number of parts, simple manufacture, convenient use, long service life and light weight of the helmet.

[0022] The connecting structure of the rotating chin shield on the helmet is greatly simplified in the various connection parts of the rotation of the chin shield and the rotation of the face guard and the structure of the driving wheel part as compared with the helmets having the same or similar use effects which have been disclosed in the above-mentioned background art. The number of the parts is reduced to 1 / 3 to 1 / 5 of the number of the parts for mounting the driving chin shield and the face guard on the existing similar helmets, and the complexity of each part is also greatly simplified, so that the helmet product has a great improvement in the use performance thereof. Since the number of parts is small and the structure of each part is simple, the manufacturing cost of the helmet will be lower, the reliability in use will be improved, the service life will be extended, the assembly and disassembly of the helmet will be more convenient, and the opening / closing operation of the chin shield and the face guard during use will be more convenient, faster and more stable. The chin shield of the present invention can achieve the linkage between the chin shield and the face guard by means of the chin drive assembly, the linkage guide ring member and the face guard mounting member. When the chin shield is lifted up from the bottom in the initial state, the face guard can be lifted up at the same time. When the lower edge of the chin shield is turned to the brim part of the helmet, the face guard can freely rotate up and down, and the chin shield can also continue to rotate backwards to the final limiting position. When the chin shield is rotated to the return position, and the lower edge of the chin shield is rotated to the helmet brim part, if the face guard is in the upwards lifting state, the chin shield will rotate downwards together with the face guard to return to the initial state by the linkage guide ring member.Brief Description of the Drawings

[0023] Fig. 1 is a schematic perspective view of a helmet in a connecting structure of the helmet of the present invention; Fig. 2 is an explosive schematic view showing a connecting structure at one side of the connecting structure of the helmet according to the present invention; Fig. 3 is a partially enlarged view of the connecting structure of Fig. 2 according to the present invention; Fig. 4 is a structurally schematic view of an outer side of a rotating component mounting plate in an initial state in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 5 is a structurally schematic view of an inner side of the rotating component mounting plate in an initial state in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 6 is a structurally schematic view of the outer side of the rotating component mounting plate in a state where the chin shield moves the face guard while lifting the face guard upwards in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 7 is a structurally schematic view of the inner side of the rotating component mounting plate in a state where the chin shield moves the face guard while lifting the face guard upwards in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 8 is a structurally schematic view of the inner side of the rotating component mounting plate in a state that the chin shield moves the face guard upwards and to a rotation termination state in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 9 is a structurally schematic view of the inner side of the rotating component mounting plate in a state that the chin shield moves the face guard upwards and to a rotation termination state in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 10 is a structurally schematic view of the outer side of the rotating component mounting plate in a state that the chin shield continues to be rotated backwards after the upward rotation of the face guard is terminated in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 11 is a structurally schematic view of the inner side of the rotating component mounting plate in a state that the chin shield continues to be rotated backwards after the upward rotation of the face guard is terminated in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 12 is a structurally schematic view of the outer side of the rotating component mounting plate in a state where the chin shield is also rotated backwards to the end point after the upward rotation of the face guard is terminated in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 13 is a structurally schematic view of the inner side of the rotating component mounting plate in a state where the chin shield is also rotated backwards to the end point after the upward rotation of the face guard is terminated in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 14 is a structurally schematic view of the inner side of the rotating component mounting plate in a state where the face guard rotates downwards to the end point and then starts to rotate upwards after the chin shield rotates backwards to the end point in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 15 is a structurally schematic view of the inner side of the rotating component mounting plate in a state that the chin shield starts to rotate forwards and the face guard rotates upwards in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 16 is a structurally schematic view of the inner side of the rotating component mounting plate during the initial forward rotation of the chin shield and the upward rotation of the face guard to the final position in the operation principle of the connecting structure of the helmet according to the present invention; Fig. 17 is a structurally schematic view of the inner side of the rotating component mounting plate in a state that the chin shield starts to rotate forwards to the end point and the face guard rotates upwards to the end point in the operation principle of the connecting structure of the helmet according to the present invention; and Fig. 18 is a structurally schematic view of the inner side of the chin shield of Fig. 1 in the connecting structure of the helmet according to the present invention.

[0024] In the drawings, 1, helmet body; 2, face guard; 3, chin shield; 4, mounting groove; 5, face guard rotation limiting member; 6, rotating component mounting plate; 7, face guard mounting member; 8, linkage guide ring member; 9, first rotary shaft; 10, annular groove; 11, driving block; 12, second rotary shaft; 12.1, fastener; 13, fastener; 14, strip-shaped sliding block; 15, elastic member; 16, strip-shaped rod; 17, arc-shaped groove; 18, columnar projection; 19, first mounting hole; 20, second mounting hole; 21, through hole; 22, convex tooth; 23, C-shaped guide groove; 24, through hole; 25, mounting hole; 26, fastener; 27, driving gear; 28, driven gear; 29, fixed shaft; 30, stepped hole; 31, end cap; 32, radial slot; 33, boss; 34, projection; 35, mounting hole; 36, insert-connection slot; 37, connecting hole; 38, groove; 39, projection; 40, radial positioning groove; 41, radial positioning sliding block; 42, radial positioning sliding block; 43, elastic member; 44, insert-connection tooth; 45, mounting hole.

[0025] Here, the rotating member of the chin shield includes 27, a driving gear; 28, a driven gear, 12, and a second rotary shaft.

[0026] The mounting member of the rotating member of the chin shield includes 29, a fixed shaft; 6, a rotating component mounting plate; 31, an end cap; 12.1, a fastener; and 26, a fastener.

[0027] The chin shield rotation limiting member and the limiting structure include: 39, a projection; 40, a radial positioning groove; 41, a radial positioning sliding block; 42, a radial positioning sliding groove; and 43, an elastic member;

[0028] The mounting structure of the chin shield rotating member includes 23, a C-shaped guide groove; 30, a stepped hole; 31, an end cap; 32, a radial slot; 24, a through hole; 4, a mounting groove; 33, a boss; 34, a projection ; 35, a mounting hole; 36, an insert-connection slot; 37, a connecting hole; 21, a through hole, 22, a convex tooth; 38, a groove; 44, an insert-connection tooth; 45, a mounting hole; and 25, a mounting hole.

[0029] The linkage components and mounting structure of the chin shield and the face guard include: 11, a driving block; 8, a linkage guide ring member; 9, a first rotary shaft; 10, an annular groove; 19, a first mounting hole; and 20, a second mounting hole.

[0030] The mounting member of the face guard includes: 7, a face guard mounting member.

[0031] The limiting member of the face guard includes: 5, a face guard rotation limiting member, 14, a strip-shaped sliding block, 13, a fastener; 15, an elastic member, 16, a strip-shaped rod, 18, a columnar projection; and 17, an arc-shaped groove;Detailed Description of the Invention

[0032] The technical solutions in the examples of the invention will be described clearly and completely in conjunction with the accompanying drawings in the examples of the invention. Obviously, the described examples are only part of the examples of the invention, rather than all of the examples.

[0033] As shown in Figs. 1-18, the present invention is a connecting structure of a rotating chin shield on a helmet, wherein the helmet includes a helmet body 1; a face guard 2 and a chin shield 3 are symmetrically hinged on both sides of the helmet body 1 by a face guard rotating component and a chin shield rotating component, respectively; mounting grooves 4 are symmetrically provided on both sides of the helmet body 1, characterized in that a face guard rotation limiting member 5 and a rotating component mounting plate 6 are mounted in the mounting groove 4; a face guard mounting member 7 in the face guard rotating component is mounted inside the rotating component mounting plate 6; the face guard 2 is connected to an end of a linkage guide ring member 8 via the face guard mounting member 7; the vicinity of the other end of the linkage guide ring member 8 is hinged to the rotating component mounting plate 6 via a first rotary shaft 9; a driving block 11 cooperating with the inner side of an annular groove 10 is provided in the annular groove 10 on the linkage guide ring member 8; the driving block 11 passes through the rotating component mounting plate 6 via a second rotary shaft 12 and is connected to a chin shield rotating component provided on the outer side of the rotating component mounting plate 6; and the chin shield rotating component is connected to the rotating component mounting plate 6 and the chin shield 3, respectively. The cooperation of the linkage guide ring member 8 with the driving block 11 enables the linkage of the chin shield 3 with the face guard 2 and the independent rotation of the face guard 2.

[0034] In order to facilitate hiding the face guard rotating component and the chin shield rotating component inside the helmet body so as not to be damaged, and also to achieve an aesthetic appearance effect, the preferred implementation solution of the invention is that the mounting grooves 4 are symmetrically provided at both sides of the helmet body 1, and are respectively provided as inwardly recessed grooves, the grooves being of a two-layer stepped groove structure. The grooves are provided as a stepped structure because the linkage guide ring member 8 mounted in the grooves and the face guard rotation limiting member 5 are components of a two-layer structure; the two-layer grooves include a mounting groove 4 of a face guard rotation limiting member 5 located at a second layer and a mounting groove of a rotating component mounting plate 6 located at a first layer, respectively; the shape of the face guard rotation limiting member 5 mounting groove 4 is adapted to the shape of the face guard rotation limiting member 5; and the shape of the rotating component mounting plate 6 mounting groove is adapted to the shape of the rotating component mounting plate 6.

[0035] In order to effectively limit the rotation range of the face guard and also enable the face guard not to automatically slide down after rotating to a predetermined position, or cause the face guard to swing up and down due to vibration and jerk of the helmet body when the helmet is worn, the preferred implementation solution of the invention is that the face guard rotation limiting member 5 includes a strip-shaped sliding block 14 and a strip-shaped rod 16; wherein the vicinity of both ends of the strip-shaped rod 16 is connected to the mounting groove via a fastener; one side of the strip-shaped rod 16 is connected to the strip-shaped sliding block 14 via two elastic members (springs); one side of the strip-shaped sliding block is provided with an arc-shaped groove 17 for positioning the face guard 2; a plurality of segments of arc-shaped grooves with different curvature radii are provided on the arc-shaped groove 17 to constitute a toothed arc-shaped limiting guide groove; the strip-shaped rod 16 and the strip-shaped sliding block 14 are a shell structure, respectively; and one side of the cavity of the strip-shaped rod 16 and the strip-shaped sliding block 14 faces towards the mounting groove 4. This configuration is intended to limit the face guard 2 to stay in any position without slipping off automatically or because of the jounce of the helmet. Since the face guard 2 is mounted on the face guard mounting member 7, the face guard mounting member 7 and the linkage guide ring member 8 are connected together; a columnar projection 18 is provided on a side of the linkage guide ring member 8; the columnar projection 18 is clamped on a plurality of arc-shaped grooves with different curvature radii of the strip-shaped sliding block 14; when the face guard 2 moves up and down to different positions, it is clamped on the plurality of arc-shaped grooves with different curvature radii of the strip-shaped sliding block 14 by the columnar projection 18. The strip-shaped sliding block 14 can bear against the columnar projection 18 under the elastic force of the spring, and the bearing against the columnar projection 18 also defines the rotation mounted on the face guard mounting member 7, i.e., defines the rotation of the face guard. The spring force of the single spring 15 does not limit the rotation of the hand pushing the face guard.

[0036] In order to facilitate the connection of the face guard and the linkage guide ring member 8 together, and also facilitate the composition of simplifying the installation operation, the preferred implementation solution of the invention is that the linkage guide ring member 8 has a C-shaped open ring-shaped structure; one end of the linkage guide ring member 8 with the C-shaped open ring-shaped structure is connected to the face guard mounting member; a side columnar projection (as shown in Fig. 18) facing towards the mounting groove 4 is provided near the connection part, and the columnar projection cooperates with the arc-shaped groove to form a limit for the face guard; a first mounting hole 19 of the first rotary shaft 9 is provided near the other end of the C-shaped open ring-shaped linkage guide ring member 8; a second mounting hole 20 of the first rotary shaft 9 is provided on the rotating component mounting plate 6; and the first rotary shaft 9 mounts the linkage guide ring member 8 and the face guard mounting member 7 on the rotating component mounting plate 6 via the first mounting hole 19, the second mounting hole 20 and the fastener, and enables the linkage guide ring member 8 and the face guard mounting member 7 to rotate on the rotating component mounting plate 6 around the first rotary shaft 9. The first rotary shaft 19 is a component about which the linkage guide ring member 8 and the face guard mounting member 7 rotate. The linkage guide ring member 8 and the face guard mounting member 7 are rotated under the drive of the driving block 11. When the chin shield 3 is pushed to rotate by hand, the chin shield 3 drives the driving gear 27 to rotate, and the driving gear 27 drives the driving block to rotate. The triangular shape of the driving block 11 presses the inner side of the C-shaped split ring of the linkage guide ring member 8 to drive the rotation of the linkage guide ring member 8. Since the inner side of the C-shaped split ring of the linkage guide ring member 8 has different curved surface sections, the chin shield 3 and the face guard 2 can be linked together, or the face guard 2 can be rotated separately.

[0037] In order to minimize the structural size of the linkage guide ring member, reduce the weight of the linkage guide ring member 8, facilitate the connection between the linkage guide ring member 8 and the rotating component mounting plate 6, and facilitate the face guard rotating around the second rotary shaft 12 to stay at a predetermined position without slipping off, a preferred implementation solution of the invention also includes that the face guard mounting member 7 has a strip-like arc-shaped surface structure; one side of an outer arc-shaped surface of the strip-like arc-shaped surface is adapted to be connected to the face guard 2, and a side of the inner arc-shaped surface of the strip-like arc-shaped surface is adapted to be connected to the linkage guide ring member 8; or the face guard mounting member 7 and the linkage guide ring member 8 form an integral structure; and the strip-like arc-shaped surface being provided with slots and / or raised edges on a side of the outer arc-shaped surface adapted to be connected to the face guard 2, and the width of the strip-like arc-shaped surface is greater than the width of the linkage guide ring member 8.

[0038] In order to facilitate driving the linkage guide ring member 8 to rotate around the second rotary shaft 12 and certainly drives the face guard to rotate together by the chin shield 3 and the chin shield rotating component driving the driving block 11 together, a preferred implementation solution of the invention also includes that the driving block is in the form of a triangular plate-like body having a through hole 21 at the center thereof; and a convex tooth 22 is provided at the periphery of the through hole 21 at a side of the triangular plate-like body facing towards the rotating component mounting plate 6; and the convex tooth 22 is used to be inserted into a groove 38 on the other side annular surface of the driving gear 27, so that the driving gear 27 drives the driving block 11 to rotate together.

[0039] In order to facilitate guiding and defining the movement track of the driving block, facilitate mounting the chin shield rotating component on the rotating component mounting plate 6, and also minimize the structural size and weight of the rotating component mounting plate 6, a further preferred implementation solution of the invention is that the rotating component mounting plate 6 has a D-shaped shell structure, and the rotating component mounting plate 6 is made into a D-shaped shell structure, mainly in order to enable one side of the rotating component mounting plate 6 to accommodate the linkage guide ring member 8 and the face guard mounting member 7, and the other side to facilitate linking with the chin shield 3. A side of the D-shaped shell structure facing towards the mounting groove is provided with a turnup. The function of the stepped turnup is used for the rotating guide of the face guard mounting member 7; wherein the turnup at one side of the vertical straight edge of the D-shaped shell structure is a stepped turnup, and the stepped turnup is used for guiding the rotation of the face guard mounting member; a C-shaped guide groove 23 is provided on the rotating component mounting plate 6 of the D-shaped shell structure; a through hole 24 for the second rotary shaft 12 to pass through is provided on the D-shaped shell in the surrounding of the C-shaped guide groove; and a mounting hole 25 is further provided on the rotating component mounting plate of the D-shaped shell structure 6, wherein the mounting hole 25 is used for mounting the rotating component mounting plate 6 on the helmet body 1 by using a screw 26, and the rotating component mounting plate 6 is fixedly mounted on the mounting groove 4 by the mounting hole 25 using a fastener 26.

[0040] In order to facilitate guiding and defining the movement track of the driving block 11, facilitate mounting the chin shield rotating component on the rotating component mounting plate 6, and also minimize the structural size and weight of the rotating component mounting plate 6, a further preferred solution of the invention is that the chin shield rotating component includes a driving gear 27; the driving gear 27 is meshed with a driven gear 28; the driven gear 28 is fixedly mounted near one end of the C-shaped guide groove via a fixed shaft 29; the center of the driving gear 27 is provided with a stepped hole 30 cooperating with a second rotary shaft 12; the second rotary shaft 12 is a hollow shaft for facilitating the passage of a fixing screw 12.1 from the center of the hollow shaft. The function of the hollow shaft is to make the driving gear 27 rotate on the hollow shaft and rub against the outer surface of the hollow shaft, but do not rub against the fixing screw 12.1 to cause the fixing screw 12.1 to loosen. One end of the second rotary shaft 12 is provided with an end cap 31 cooperating with the stepped hole 30, and the end cap 31 is used for cooperating with the screw cap; the other end of the second rotary shaft 12 is provided with a radial slot 32, wherein the radial slot 32 is a clamping groove for cooperating with a projection 35 on a boss 33 in a mounting groove 4 on the helmet, and is a structure for preventing the second shaft from rotating; the other end of the second rotary shaft 12 passes through the stepped hole 30 and a through hole on the driving block 11 and cooperates with a projection 34 provided on a boss 33 in the mounting groove 4; and the hollow shaft of the second rotary shaft 12 is connected to the mounting hole 35 on the boss 33 via a fastener. The driving gear 27 is provided with an insert-connection slot 36 of the chin shield 3 into the ring surface between the driving teeth and the stepped hole 30. The insert-connection slot 36 is used for inserting the insert-connection teeth protruding on the inner side of the chin shield 3. The connecting hole 37 is used for fixing the chin guard to the driving gear 27 with a screw so that the driving gear 27 can be rotated when the chin shield 3 is rotated. The driving gear 27 is provided with a groove for engaging with the convex teeth 22 on the driving block 11 on the other ring surface between the driving teeth and the stepped hole 30. Since the chin shield 3 is mounted to the side of the driving gear 27, when the chin shield 3 is pushed to rotate, the driving gear 27 will rotate about the second rotary shaft 12. Also, the driving gear 27 meshes with the driven gear 28, which is mounted to the rotating component mounting plate 6 via the fixed shaft 29, the rotating component mounting plate 6 being mounted to the helmet body 1. The gear transmission structure is used in order to allow the chin shield to rotate more smoothly and to extend the service life.

[0041] In order to facilitate guiding and defining the movement track of the driving block, facilitate mounting the chin shield rotating component on the rotating component mounting plate 6, and also, in order to minimize the structural size and weight of the rotating component mounting plate 6, a further preferred implementation solution of the invention is that the driving gear 27 is an incomplete gear; since the rotation range of the chin shield 3 is about 250 degrees, it is not necessary for the driving gear 27 to be a complete gear; the incomplete gear is provided with a projection 39 on an annular surface without teeth, a radial positioning groove 40 is provided on the projection 39, and this positioning groove is used for limiting that the rotation of the chin shield 3 is stopped after rotating to a certain position; a side projection protruding from the driving gear 27 is provided on a side of the projection 39 facing towards the rotating component mounting plate 6; the projection 39 is in sliding fit with the C-shaped guide groove, and the side projection is used for guiding the driving gear 27 to rotate along the range of the C-shaped guide groove, and can ensure the smooth engagement between the driving gear 27 and the driven gear 28; the radial positioning groove 40 cooperates with a radial positioning sliding block 41, the radial positioning groove on the driving gear 27 cooperates with the radial positioning sliding block 41, and the radial positioning sliding block 41 and the radial positioning sliding groove 42 mutually slidingly cooperate. That is to say, after the radial positioning groove 40 on the driving gear 27 rotates to the position where the radial positioning sliding block 41 is located, the radial positioning groove 40 will be caught by the radial positioning sliding block 41 and cannot continue to rotate any more, and the radial positioning sliding block 41 and the radial positioning sliding groove 42 mutually slidingly cooperate. The radial positioning sliding block 41 is an elongated sliding block, the upper end is used for limiting the rotation of the driving gear 27, and the radial positioning sliding groove slides in the radial positioning sliding groove 42 below. The radial positioning sliding groove 42 is a U-shaped member. The radial positioning sliding groove 42 is mounted on the inner side of the rotating component mounting plate 6 by means of a fastener. One end of the radial positioning sliding block 41 passes through the rotating component mounting plate 6 and is located on the outer side of the rotating component mounting plate 6. An elastic member 43 is provided between the radial positioning sliding block 41 and the radial positioning sliding groove 42.

[0042] In order to facilitate the connection of the chin shield 3 to the chin shield rotating component and also the connection of the chin shield rotating component to the driving block 11, and in order to minimize the constructional dimensions of the chin shield mounting component and to reduce the weight of the chin shield mounting component, a further preferred implementation solution of the invention is that the side of the chin shield 3 facing towards the driving gear 27 is provided with an insert-connection tooth 44 adapted to the insert-connection slot 36, the chin shield 3 is provided with a mounting hole 45 corresponding to the connecting hole 37, and a fastener (screw) is mounted in the connecting hole 37 and the mounting hole 45.

[0043] The operating principle of the connecting structure of the rotating chin shield on the helmet is as follows.

[0044] As shown in Figs. 1-18, the helmet body 1 is formed by injection molding of an injection-molded part. A mounting groove 4 is formed by injection molding on both sides of the helmet body 1. A second layer of the mounting groove 4 is used for mounting a face guard rotation limiting member 5, and a first layer of the mounting groove 4 is used for mounting a rotating component mounting plate 6. The linkage guide ring member 8 is hingedly mounted on and connected to one side of the rotating component mounting plate 6 facing towards the mounting groove 4. The linkage guide ring member 8 is of a C-shaped annular structure, and the vicinity of one end of the C-shaped annular structure of the linkage guide ring member 8 is connected to the rotating component mounting plate 6 via a first rotary shaft 9. The other end of the C-shaped ring-shaped structure linkage guide ring member 8 is connected to the face guard mounting member 7 which has an arc-shaped strip-shaped structure. The face guard 2 is mounted on the outer arc surface of the face guard mounting member 7 with the arc-shaped strip-shaped structure. Near the other end of the C-shaped ring-shaped structure linkage guide ring member 8, a columnar projection 18 is provided on a side facing towards the mounting groove 4, and the columnar projection 18 is in sliding fit with an arc-shaped groove 17 on the strip-shaped sliding block 14 in the face guard rotation limiting member 5 mounted in the stepped mounting groove 4. The arc-shaped groove 17 on the strip-shaped sliding block 14 is provided with a plurality of arc-shaped grooves with different curvature radii to constitute a toothed arc-shaped limiting guide groove for the positioning of the face guard 2, that is to say, the face guard can be allowed to stay at different positions without sliding. The strip-shaped sliding block 14 is in sliding fit with a strip-shaped rod 16 in the face guard rotation limiting member 5 by an elastic member (spring) 15, and the strip-shaped rod 16 is installed in the mounting groove 4 by a fastener screw. When the face guard 2 is pushed to slide up and down, the face guard 2 rotates around the first rotary shaft 9 on the rotating component mounting plate 6 via the face guard mounting member 7 and the linkage guide ring member 8. Near the other end of the C-shaped ring-shaped structure linkage guide ring member 8, the columnar projection 18 on the side facing towards the mounting groove 4 slides on the arc-shaped groove 17 on the strip-shaped sliding block 14. The strip-shaped sliding block 14 is always kept in pressing contact with the columnar projection 18 under the action of the elastic piece (spring) 15. A guide groove and a guide strip are further provided between the strip-shaped sliding block 14 and the strip-shaped rod 16.

[0045] A driving block 11 is also provided in the ring of the C-shaped ring structure linkage guide ring member 8, the driving block 11 having a triangular structure, and the driving block 11 being used for driving the C-shaped ring structure linkage guide ring member 8. The chin shield 3 and the face guard 2 in the initial state are both located at the lowermost state. When the chin shield 3 needs to be lifted up, the right side top corner of the triangular structure driving block 11 is in contact with the inner ring of the C-shaped annular straight edge section on a side of the linkage guide ring member 8 with a C-shaped annular structure close to the first rotary shaft 9 under the driving of the second rotary shaft 12, and the right side top corner of the triangular structure driving block 11 presses the C-shaped straight edge section to rotate clockwise around the first rotary shaft 9. Thus, the face guard 2 is pushed to lift up together, namely, the linkage stage of the face guard 2 and the chin shield 3. When the face guard 2 lifts up to the end point, namely, at the upper brim part of the helmet, the right-side top angle of the triangular structure driving block 11 has been rotated to the arc segment of the C-shaped ring. At this moment, the face guard 2 can be individually rotated downwards or upwards (disengaged from the linkage stage), and the chin shield 3 can also continue to be turned upwards and backwards. When the chin shield 3 is turned backwards to the end point (the chin shield rotation limiting point), the right-side top angle of the triangular structure driving block 11 has been rotated to the left of the arc segment of the C-shaped ring, and the left-side top angle of the triangular structure driving block 11 has been rotated to the right of the arc segment of the C-shaped ring. If the chin shield 3 needs to be turned upwards and forwards, at this time, if the face guard 2 is located at the lower end of the helmet body 1, the triangular structure driving block 11 is rotated counterclockwise by the driving of the second rotary shaft 12, and the left top corner of the triangular structure driving block 11 is brought into contact with and pressed against the inner ring of the C-shaped ring-shaped straight edge section of the linkage guide ring member 8, so that the face guard 2 is lifted up to the end, or the face guard 2 is previously lifted up to the upward end position, and then the left top corner of the triangular structure driving block 11 is rotated and reset to the left side of the initial position at the opening section of the C-shaped ring. At this moment, the face guard 2 can be rotated down to the initial position again.

[0046] The driving block 11 with a triangular structure is a hollow shaft mechanism. The hollow shaft is provided with a convex tooth 22 at a port portion on one side facing towards the rotating component mounting plate 6, and the convex tooth 22 is engaged with a groove 38 on the other side of the driving gear 27, so that the driving gear 27 drives the driving block 11 to rotate together. The rotating component mounting plate 6 is of a D-shaped shell structure; a turnup is provided at a side of the D-shaped shell structure facing towards the mounting groove 4, wherein the turnup of the D-shaped shell structure on the side of the vertical straight side is a stepped turnup; a C-shaped guide groove 23 is provided on the rotating component mounting plate 6 with the D-shaped shell structure; a through hole 24 for the second rotary shaft 12 to pass through is provided on the D-shaped shell enclosed by the C-shaped guide groove; a mounting hole 25 is further provided on the rotating component mounting plate 6 with the D-shaped shell structure; and the mounting hole 25 fixedly mounts the rotating component mounting plate 6 to the mounting groove 4 by the fastener (screw) 26. The chin shield rotating member includes a driving gear 27 engaged with a driven gear 28; the driven gear 28 is fixedly mounted near an end of the C-shaped guide groove 23 via a fixed shaft 29; a stepped hole 30 is provided in the center of the driving gear 27 and cooperates with the second rotary shaft 12 which is a hollow shaft; an end of the second rotary shaft 12 is provided with an end cap 31 cooperating with the stepped hole 30; the other end of the second rotary shaft 12 is provided with a radial slot 32; the other end of the second rotary shaft 12 passes through the stepped hole 30, and the through hole 21 on the driving block 11 and is matched with a boss 34 provided on a boss 33 in the mounting groove 4, and the hollow shaft of the second rotary shaft 12 is connected to a mounting hole 35 on the boss 33 via a fastener (screw) 12.1; the driving gear 27 is provided with an insert-connection slot 36 and a connecting hole 37 of the chin shield on a side annular surface between the driving tooth and the stepped hole 30; and the driving gear 27 is provided with a groove 38 which is engaged with a convex tooth 22 on the driving block 11 on the other side annular surface between the driving tooth and the stepped hole 30. The driving gear 27 is an incomplete gear; a projection 39 is provided on an annular surface without teeth; a radial positioning groove 40 is provided on the projection 39; a side of the projection 39 facing towards the rotating component mounting plate 6 protrudes from a side of the driving gear 27, and the side projection is in sliding fit with the C-shaped guide groove 23; the radial positioning groove 40 cooperates with a radial positioning sliding block 41; the radial positioning sliding block 41 and the radial positioning sliding groove 42 slidingly cooperate with each other; the radial positioning sliding groove 42 is mounted on the inner side of the rotating component mounting plate 6 by the fastener; one end of the radial positioning sliding block 41 passes through the rotating component mounting plate 6 and is located on the outer side of the rotating component mounting plate 6; and an elastic member (spring) 43 is provided between the radial positioning sliding block 41 and the radial positioning sliding groove 42. The side of the chin shield 3 facing towards the driving gear 27 is provided with an insert-connection tooth 44 adapted to the insert-connection slot 36, the chin shield 3 is provided with a mounting hole 45 corresponding to the connecting hole 37, and a fastener is mounted in the connecting hole 37 and the mounting hole 45.

[0047] When the chin shield 3 is pushed to rotate, the chin shield 3 pushes the driving gear 27 to rotate by means of the insert-connection tooth 44 and fasteners (screws) provided on the inner side in connection with the insert-connection grooves 36 and the connecting holes 37 provided on the opposite side of the driving gear 27, and the grooves 38 provided on the other side of the driving gear 27 engage with the convex teeth 22 on the driving block 11 to rotate the driving block 11. Since the driving gear 27 is an incomplete gear, it is not able to rotate one turn, so that the chin shield 3 cannot rotate one turn. Furthermore, a projection 39 is provided at one end of the incomplete gear teeth, and a radial positioning groove 40 is also provided on the projection 39. After rotating to a set position, the radial positioning groove 40 is caught by a radial positioning sliding block 41 and cannot continue to rotate any more. The radial positioning sliding block 41 is in sliding engagement with a radial positioning sliding groove 42 mounted on the inner side of the rotating component mounting plate 6 via an elastic member (spring) 43. The second rotary shaft 12 is a hollow shaft, and the hollow shaft is connected to a mounting hole provided on the boss of the mounting groove 4 by a fastener (screw) 12.1 passing through the hollow second rotary shaft 12 and the triangular driving block 11. When the driving gear 27 is rotated, one side of the projection 39 at one end of the incomplete gear tooth is slidably matched with the C-shaped guide groove 23 provided on the rotating component mounting plate 6.

[0048] The above description presents only the preferred specific embodiments of the present invention. However, the scope of protection for the present invention is not limited to these embodiments. The equivalent replacements or modifications based on the technical solutions and inventive concepts of the invention made by any technical personnel familiar with the technical field of the invention, within the technical scope disclosed by the present invention, shall be encompassed within the protection scope of the present invention.

Claims

1. A connecting structure of a helmet, comprising a helmet body (1); a face guard (2) and a chin shield (3) are symmetrically hinged on both sides of the helmet body (1) by a face guard rotating component and a chin shield rotating component, respectively; mounting grooves (4) are symmetrically provided on both sides of the helmet body (1), characterized in that a face guard rotation limiting member (5) and a rotating component mounting plate (6) are mounted in the mounting groove (4); a face guard mounting member (7) in the face guard rotating component is mounted inside the rotating component mounting plate (6); the face guard (2) is connected to an end of a linkage guide ring member (8) via the face guard mounting member (7); the vicinity of the other end of the linkage guide ring member (8) is hinged to the rotating component mounting plate (6) via a first rotary shaft (9); a driving block (11) cooperating with the inner side of an annular groove (10) is provided in the annular groove (10) on the linkage guide ring member (8); the driving block (11) passes through the rotating component mounting plate (6) via a second rotary shaft (12) and is connected to a chin shield rotating component provided on the outer side of the rotating component mounting plate (6); and the chin shield rotating component is connected to the rotating component mounting plate (6) and the chin shield (3), respectively.

2. The connecting structure of the helmet according to claim 1, characterized in that the mounting grooves (4) are symmetrically provided at both sides of the helmet body (1) and are respectively provided as inwardly recessed grooves, the grooves being of a two-layer stepped groove structure; the two-layer grooves include a mounting groove (4) of a face guard rotation limiting member (5) located at a second layer and a mounting groove of a rotating component mounting plate (6) located at a first layer, respectively; the shape of the face guard rotation limiting member mounting groove (4) is adapted to the shape of the face guard rotation limiting member (5); and the shape of the rotating component mounting plate (6) mounting groove is adapted to the shape of the rotating component mounting plate (6).

3. The connecting structure of the helmet according to claim 1, characterized in that the face guard rotation limiting member (5) comprises a strip-shaped sliding block (14) and a strip-shaped rod (16); wherein the vicinity of both ends of the strip-shaped rod (16) is connected to the mounting groove (4) via a fastener (13); one side of the strip-shaped rod (16) is connected to the strip-shaped sliding block (14) via an elastic member (15); one side of the strip-shaped sliding block (14) is provided with an arc-shaped groove (17) for positioning the face guard (2); a plurality of segments of arc-shaped grooves with different curvature radii are provided on the arc-shaped groove (17) to constitute a toothed arc-shaped limiting guide groove; the strip-shaped rod (16) and the strip-shaped sliding block (14) are a shell structure, respectively; and one side of the cavity of the strip-shaped rod (16) and the strip-shaped sliding block (14) faces towards the mounting groove (4).

4. The connecting structure of the helmet according to claim 3, characterized in that the linkage guide ring member (8) has a C-shaped open ring-shaped structure; one end of the linkage guide ring member (8) with the C-shaped open ring-shaped structure is connected to the face guard mounting member (7); a side columnar projection (18) facing towards the mounting groove (4) is provided near the connection part, and the columnar projection (18) cooperates with the arc-shaped groove (17) to form a limit for the face guard; a first mounting hole (19) of the first rotary shaft (9) is provided near the other end of the C-shaped open ring-shaped linkage guide ring member (8); a second mounting hole (20) of the first rotary shaft (9) is provided on the rotating component mounting plate (6); and the first rotary shaft (9) mounts the linkage guide ring member (8) and the face guard mounting member (7) on the rotating component mounting plate (6) via the first mounting hole (19), the second mounting hole (20) and the fastener, and enables the linkage guide ring member (8) and the face guard mounting member (7) to rotate on the rotating component mounting plate (6) around the first rotary shaft (9).

5. The connecting structure of the helmet according to claim 1, characterized in that the face guard mounting member (7) has a strip-like arc-shaped surface structure; one side of an outer arc-shaped surface of the strip-like arc-shaped surface is adapted to be connected to the face guard (2), and the other side of the inner arc-shaped surface of the strip-like arc-shaped surface is adapted to be connected to the linkage guide ring member (8); or the face guard mounting member (7) and the linkage guide ring member (8) form an integral structure; and the strip-like arc-shaped surface being provided with slots and / or raised edges on a side of the outer arc-shaped surface adapted to be connected to the face guard (2), and the width of the strip-like arc-shaped surface is greater than the width of the linkage guide ring member (8).

6. The connecting structure of the helmet according to claim 1, characterized in that the driving block (11) is in the form of a triangular plate-like body having a through hole (21) at the center thereof; and a convex tooth (22) is provided at the periphery of the through hole (21) at a side of the triangular plate-like body facing towards the rotating component mounting plate (6).

7. The connecting structure of the helmet according to claim 1, characterized in that the rotating component mounting plate (6) is of a D-shaped shell structure; a turnup is provided at a side of the D-shaped shell structure facing towards the mounting groove (4), wherein the turnup of the D-shaped shell structure on the side of the vertical straight side is a stepped turnup; a C-shaped guide groove (23) is provided on the rotating component mounting plate (6) with the D-shaped shell structure; a through hole (24) for the second rotary shaft (12) to pass through is provided on the D-shaped shell enclosed by the C-shaped guide groove; a mounting hole (25) is further provided on the rotating component mounting plate (6) with the D-shaped shell structure; and the mounting hole (25) fixedly mounts the rotating component mounting plate (6) to the mounting groove (4) by the fastener (26).

8. The connecting structure of the helmet according to claim 6, characterized in that the chin shield rotating member comprises a driving gear (27) engaged with a driven gear (28); the driven gear (28) is fixedly mounted near an end of the C-shaped guide groove (23) via a fixed shaft (29); a stepped hole (30) is provided in the center of the driving gear (27) and cooperates with the second rotary shaft (12) which is a hollow shaft; an end of the second rotary shaft (12) is provided with an end cap (31) cooperating with the stepped hole (30); the other end of the second rotary shaft (12) is provided with a radial slot (32); the other end of the second rotary shaft (12) passes through the stepped hole (30), and the through hole (21) on the driving block (11) and is matched with a boss (34) provided on a boss (33) in the mounting groove (4), and the hollow shaft of the second rotary shaft (12) is connected to a mounting hole (35) on the boss (33) via a fastener (12.1); the driving gear (27) is provided with an insert-connection slot (36) and a connecting hole (37) of the chin shield on a side annular surface between the driving tooth and the stepped hole (30); and the driving gear (27) is provided with a groove (38) which is engaged with a convex tooth (22) on the driving block (11) on the other side annular surface between the driving tooth and the stepped hole (30).

9. The connecting structure of the helmet according to claim 8, characterized in that the driving gear (27) is an incomplete gear; a projection (39) is provided on an annular surface without teeth; a radial positioning groove (40) is provided on the projection (39); a side projection protruding from the driving gear (27) is provided on a side of the projection (39) facing towards the rotating component mounting plate (6), and the side projection is in sliding fit with the C-shaped guide groove (23); the radial positioning groove (40) cooperates with a radial positioning sliding block (41); the radial positioning sliding block (41) and the radial positioning sliding groove (42) slidingly cooperate with each other; the radial positioning sliding groove (42) is mounted on the inner side of the rotating component mounting plate (6) by the fastener; one end of the radial positioning sliding block (41) passes through the rotating component mounting plate (6) and is located on the outer side of the rotating component mounting plate (6); and an elastic member (43) is provided between the radial positioning sliding block (41) and the radial positioning sliding groove (42).

10. The connecting structure of the helmet according to claim 8, characterized in that a side of the chin shield (3) facing towards the driving gear (27) is provided with an insert-connection tooth (44) adapted to the insert-connection slot (36); the chin shield (3) is further provided with a mounting hole (45) corresponding to the connecting hole (37); and a fastener is mounted in the connecting hole (37) and the mounting hole (45).

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