Helmet with size convenient to adjust

Abstract

The invention discloses a helmet convenient in size adjustment, which comprises a rear cap shell, a front cap shell capable of moving back and forth relative to the rear cap shell is arranged in the rear cap shell, and is characterized in that accommodating grooves are respectively formed in two sides of the rear cap shell, extension connecting parts are arranged at positions, corresponding to the accommodating grooves, of the front cap shell, and the extension connecting parts are connected with the rear cap shell. A containing groove is formed in the extension connecting part, a sliding rail is fixedly arranged in the containing groove, a sliding seat is arranged in the sliding rail, an assembling groove hole is formed in the extension connecting part, the sliding seat is assembled in the assembling groove hole, and a locking mechanism capable of being unlocked when pressed is arranged between the sliding rail and the sliding seat. In order to overcome the defects in the prior art, the invention provides the helmet which is simple in structure and convenient in size adjustment.

Description

Technical Field

[0001] The invention relates to the technical field of helmets, and in particular to a helmet with convenient size adjustment. Background Art

[0002] Ice hockey is a fast-paced, physically confrontational sport, and therefore also has certain dangers. In such an environment, head protection is particularly critical. For ice hockey players, concussion is one of the biggest threats. Therefore, choosing the right helmet is crucial to provide effective protection for the head and prevent head injuries. An inappropriately sized helmet not only fails to provide adequate protection, but may even be more dangerous than not wearing a helmet. A helmet that is too small will put pressure on the head when blood supply to the head increases after warming up, causing headaches and discomfort, and in severe cases may even cause nausea and fainting. An oversized helmet not only affects the player's vision, but may also be unstable during intense activities, and may deviate abnormally or slip off. Not only does it fail to provide effective protection, but the edges of the helmet and face net and the fixing straps can also cause serious damage to the neck and clavicle, especially for teenagers and children.

[0003] Some existing ice hockey helmets have a re-adjustment function, which allows the helmet to better fit the player's head shape and minimize the risk of injury. Such helmets on the market are generally divided into a front and a rear shell part, which can be moved relative to each other to adjust the wearing fit. For example, U.S. Publication No. US20160235151A1 discloses an adjustable helmet for hockey or lacrosse players, the helmet comprising: a) a front shell portion; b) a rear shell portion, the front and rear shell portions can move relative to each other to adjust the fit of the helmet on the player's head; c) an adjustment mechanism, comprising: i) an actuator controlled by a single finger for adjusting the position of the front shell portion and the rear shell portion, the actuator comprising a plurality of teeth; ii) rows of holes configured to receive the teeth of the actuator, the rows of holes being associated with the front shell portion and extending to the rear shell portion, when the front shell portion moves relative to the rear shell portion, the rows of holes move relative to the rear shell portion, so that the holes in the rows of holes define a plurality of adjustment positions between the front and rear shell portions; iii) the actuator can rotate and move between a locked position and a released position, in which the teeth are in contact with at least one of the holes in each row. holes contact each other, and in the release position, the teeth clear all the holes of the plurality of rows of holes; iv) the rear shell portion has an outer side and an opposite inner side, the adjustable helmet includes a base facing the inner side of the rear shell portion, and the plurality of rows of holes are located between the second shell portion and the base; v) when the front and rear shell portions move relative to each other, the base remains stationary with the rear shell portion; vi) when the front shell portion and the rear shell portion move relative to each other, the plurality of rows of holes slide relative to the base; vii) the rear shell portion includes a plurality of holes for receiving the actuator teeth, when the actuator is in the locked position; viiii) the base includes a plurality of holes aligned with the holes on the rear shell portion; ix) in the locked position, the teeth of the actuator are configured to contact the holes of the base; x) in the release position, the teeth of the actuator clear the holes of the base; d) the helmet includes a pair of raised portions on the outer surface, extending at the top and rear of the helmet in a spaced relationship, and the actuator is located between the raised portions. This solution uses fingers to operate the actuator contained in the raised part of the top of the helmet. The actuator controls the tooth insertion hole to achieve different adjustment positions, thereby changing the position of the front shell part relative to the rear shell part, so as to adjust the front and rear length of the wearing space inside the helmet. Another example is the Chinese utility model patent publication number: CN218073693U, which discloses a helmet that can easily adjust the head size, including: a helmet shell body, the helmet shell body includes a front helmet shell and a rear helmet shell; both sides of the outside of the front helmet shell are provided with cover plates, one end of the cover plate is fixedly connected to the front helmet shell, and the other end of the cover plate is provided with a card block, and the rear helmet shell is provided with a card slot, and the card slot is provided with a card opening portion that matches the card block along its length direction.By arranging a bayonet portion in the card slot, the card block can be matched with the bayonet portion, so that the card block can be positioned and restricted in the bayonet portion, thereby achieving the purpose of adjusting the size of the helmet.

[0004] Both of the above two patent documents introduce a design that can be adjusted in the length direction of the helmet. However, its structure is relatively complicated and the adjustment is inconvenient.

[0005] Therefore, the existing helmet that can adjust the size needs to be further improved. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a helmet with a simple structure and convenient adjustment.

[0008] As for a helmet that is easy to adjust in size, in order to achieve the above-mentioned purpose, the present invention adopts the following scheme: a helmet that is easy to adjust in size, comprising a rear cap shell, in which a front cap shell that can move forward and backward relative to the rear cap shell is arranged, characterized in that: accommodating grooves are respectively arranged on both sides of the rear cap shell, and an extended connecting part is arranged at a position corresponding to the accommodating groove of the front cap shell, a slide rail is fixedly arranged in the accommodating groove, a sliding seat is arranged in the slide rail, an assembly slot hole is arranged on the extended connecting part, the sliding seat is assembled in the assembly slot hole, and a locking mechanism that can be unlocked when pressed is arranged between the slide rail and the sliding seat.

[0009] As another improvement of the helmet that is easy to adjust the size of the present invention, the locking mechanism includes a positioning rack arranged on at least one side of the slide rail, a plurality of positioning tooth grooves are evenly spaced on the positioning rack, a vertical notch is provided on one end of the sliding seat, a locking seat is movably provided in the vertical notch, a locking protrusion that can be inserted into the positioning tooth groove is provided at a position corresponding to the locking seat and the positioning rack, a button that can move up and down relative to the sliding seat is movably provided on the sliding seat, a first pressing spring is provided between the locking seat and the vertical notch, the upper end of the locking seat presses on the lower end surface of the button, an elastic member is provided in the middle of the sliding seat, the middle part of the elastic member protrudes outward and is stuck in the positioning tooth groove.

[0010] As another improvement of the helmet that is easy to adjust in size according to the present invention, a first accommodating cavity is provided in the sliding seat, a through hole is provided on the side wall of the sliding seat corresponding to the positioning tooth groove, the elastic member is arranged in the first accommodating cavity, and the outer protrusion of the elastic member passes through the through hole and is clamped in the positioning tooth groove.

[0011] As another improvement of the size-adjustable helmet of the present invention, limiting slide grooves are respectively arranged on both sides of the sliding seat, limiting buckles are arranged at positions corresponding to the buttons and the limiting slide grooves, and the limiting buckles are movably arranged in the limiting slide grooves.

[0012] As another improvement of the size-adjustable helmet of the present invention, an anti-mis-press mechanism is provided between the button and the sliding seat to prevent the button from being mis-pressed, thereby causing the locking mechanism to be unlocked.

[0013] As another improvement of the helmet that is easy to adjust the size of the present invention, the anti-mispress mechanism includes a limit column arranged in the middle part of the lower side surface of the button, a vertical accommodating groove is provided at the position corresponding to the sliding seat and the limit column, a second accommodating cavity is provided in the sliding seat, two partitions are arranged in the second accommodating cavity at intervals, a transverse slot is provided in the partition, a limit plate is movably arranged in the transverse slot, a yield groove is provided at the position corresponding to the limit plate and the limit column, the outer end of the limit plate extends out of the sliding seat and is connected to the unlocking button through a connecting piece, and a positioning protrusion is provided on one side of the inner end of the limit plate to prevent the limit plate from detaching from the transverse slot.

[0014] As another improvement of the helmet that is easy to adjust the size of the present invention, the locking mechanism includes positioning racks respectively arranged on both sides of the slide rail, a plurality of positioning tooth grooves are evenly spaced on the positioning rack, a positioning strip is provided in the sliding seat, both ends of the positioning strip are respectively arranged in the positioning tooth grooves, spring sheets are respectively provided on the lower ends of both sides of the positioning strip, the sliding seat is respectively provided with plug-in slots on both sides along the sliding direction, both ends of the spring sheets are respectively arranged in the plug-in slots, two mounting seats are spaced apart in the sliding seat, a guide hole is provided in the mounting seat, a driving seat is provided in the sliding seat between the two mounting seats, arc-shaped extrusion heads are symmetrically provided at positions corresponding to the driving seat and the positioning strips, guide columns are provided at positions corresponding to the driving seat and the guide holes, the guide columns are movably arranged in the guide holes, and a push plate is provided at the upper end of the driving seat.

[0015] As another improvement of the helmet that is easy to adjust the size of the present invention, an anti-mispush mechanism that can prevent the push plate from being pushed accidentally is provided in the driving seat. The anti-mispush mechanism includes a long through hole arranged in the bottom of the sliding seat, and a plurality of positioning clamping grooves are evenly distributed on the two sides of the long through hole along the length direction. A central slot hole is provided in the middle of the push plate and the middle of the driving seat, a pressing plate is provided in the central slot hole, a central column is provided at the center position of the lower end surface of the pressing plate, a central hole is provided at the center position of the driving seat, and a waist-shaped hole is provided on the positioning clamping strip along the length direction of the slide rail. The central column passes through the central hole, the waist-shaped hole and the long through hole in sequence, and a positioning clamping block is provided at the lower end of the central column at a position corresponding to the positioning clamping groove, the positioning clamping block is clamped in the positioning clamping groove, and a second top pressure spring is provided on the outer sleeve of the central column between the bottom of the central slot hole and the bottom surface of the pressing plate.

[0016] As another improvement of the size-adjustable helmet of the present invention, an auxiliary locking mechanism is provided between the upper end surface of the rear cap shell and the upper end surface of the front cap shell.

[0017] As another improvement of the helmet that is easy to adjust in size according to the present invention, the auxiliary locking mechanism includes a configuration slot hole arranged in the upper end surface of the rear cap shell, hinge holes are respectively arranged on both sides of the configuration slot hole, a locking plate is arranged in the configuration slot hole, a hinge shaft is arranged at a position corresponding to the locking plate and the hinge hole, the hinge shaft is arranged in the hinge hole, a plurality of clamping transverse slot holes are evenly arranged on the upper part of the front cap shell, a clamping transverse bar is arranged at a position corresponding to the locking plate and the clamping transverse slot hole, and a pulling protrusion for facilitating opening the locking plate is provided on the front side of the upper end surface of the locking plate.

[0018] In summary, the beneficial effects of the present invention compared with the prior art are as follows: a slide rail is fixedly arranged in the receiving groove of the rear cap shell, a sliding seat is arranged on the front cap shell, and the sliding seat is assembled in the slide rail, and a locking mechanism is arranged between the slide rail and the sliding seat. When the size needs to be adjusted, the locking mechanism can be unlocked by pressing the button or push plate of the locking mechanism, and then the relative position of the front cap shell and the rear cap shell can be quickly adjusted by pushing the button or push plate. After the adjustment is completed, it can be quickly locked by releasing the button or push plate. The structure is simple and the adjustment is convenient. The present invention sets an anti-mis-press mechanism or an anti-mis-push mechanism in the locking mechanism, which effectively prevents the locking mechanism from being mis-pressed or mis-pushed due to collisions during use, thereby preventing accidents and being safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is one of the three-dimensional schematic diagrams of the present invention.

[0020] Figure 2 This is one of the three-dimensional schematic diagrams of the first embodiment of the locking mechanism of the present invention.

[0021] Figure 3 This is the second stereoscopic schematic diagram of the first embodiment of the locking mechanism of the present invention.

[0022] Figure 4 for Figure 2 One of the cross-sectional diagrams of .

[0023] Figure 5 for Figure 2 The second cross-sectional diagram of .

[0024] Figure 6 It is a three-dimensional schematic diagram of a second embodiment of the locking mechanism of the present invention.

[0025] Figure 7 for Figure 6 Schematic cross-section diagram of .

[0026] Figure 8 It is a three-dimensional schematic diagram of a third embodiment of the locking mechanism of the present invention.

[0027] Fig. 9 for Figure 8 One of the cross-sectional diagrams of .

[0028] Fig.10 for Figure 8 The second cross-sectional diagram of .

[0029] Fig.11 This is one of the three-dimensional schematic diagrams of the fourth embodiment of the locking mechanism of the present invention.

[0030] Fig.12 This is the second stereoscopic schematic diagram of the fourth embodiment of the locking mechanism of the present invention.

[0031] Fig.13 for Fig.11 Schematic cross-section diagram of .

[0032] Fig.14 It is an exploded schematic diagram of the locking structure and the anti-mispush mechanism of the present invention.

[0033] Fig.15 This is one of the three-dimensional schematic diagrams of the sliding seat in the fourth embodiment of the locking mechanism of the present invention.

[0034] Fig.16 This is the second stereoscopic schematic diagram of the sliding seat in the fourth embodiment of the locking mechanism of the present invention.

[0035] Fig.17 This is the second stereoscopic schematic diagram of the present invention.

[0036] In the figure: 1, rear cap housing; 2, front cap housing; 3, receiving groove; 4, extension connection part; 5, slide rail; 6, sliding seat; 60, long hole groove; 61, bottom plate; 62, central long groove; 63, concave transverse groove hole; 64, return boss; 65, receiving notch; 66, connecting convex strip; 67, introduction arc groove; 7, assembly slot hole; 8, locking mechanism; 81, positioning rack; 82, positioning tooth groove; 83, vertical notch; 84, locking seat ; 85, locking protrusion; 86, button; 860, first top pressure spring; 87, spring groove; 88, elastic member; 89, partition; 810, introduction arc surface; 811, outer protrusion; 812, positioning card strip; 813, spring piece; 814, plug-in slot; 815, mounting seat; 816, guide hole; 817, drive seat; 818, arc extrusion head; 819, guide column; 820, push plate; 9, elastic strip; 10, first Accommodating cavity; 11, through hole; 12, arc-shaped warping portion; 13, limiting sliding groove; 14, limiting buckle; 15, anti-mis-pressing mechanism; 151, limiting column; 152, accommodating vertical groove; 153, second accommodating cavity; 154, partition; 155, horizontal slot; 156, limiting plate; 157, giving way groove; 158, connecting piece; 159, unlocking button; 1510, positioning protrusion; 16, anti-mis-push mechanism; 161, positioning card slot ; 162, center slot; 163, pressing plate; 164, center column; 165, center hole; 166, waist-shaped hole; 167, positioning clamping block; 168, second top pressure spring; 169, first arc-shaped groove; 1610, second arc-shaped groove; 17, auxiliary locking mechanism; 171, configuration slot; 172, locking plate; 173, hinge shaft; 174, clamping horizontal slot; 175, clamping horizontal bar; 176, pulling protrusion. DETAILED DESCRIPTION

[0037] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0038] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0039] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0040] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] like Figure 1-17 As shown, a helmet that is easy to adjust in size includes a rear cap shell 1, a front cap shell 2 that can move forward and backward relative to the rear cap shell 1 is provided inside the rear cap shell 1, accommodating grooves 3 are provided on both sides of the rear cap shell 1, an extended connecting portion 4 is provided at a position corresponding to the front cap shell 2 and the accommodating groove 3, a slide rail 5 is fixedly provided in the accommodating groove 3, a sliding seat 6 is provided in the slide rail 5, an assembly slot 7 is provided on the extended connecting portion 4, the sliding seat 6 is assembled in the assembly slot 7, and a locking mechanism 8 that can be unlocked when pressed is provided between the slide rail 5 and the sliding seat 6.

[0042] In the present invention, when the size of the helmet needs to be adjusted, the locking mechanism 8 is pressed to unlock the locking mechanism 8, and at this time, the sliding seat 6 can move in the slide rail 5; because the sliding seat 6 is connected to the extended connecting portion 4 of the front cap shell 2, the front cap shell 2 can move forward and backward relative to the rear cap shell 1. When the helmet is adjusted to a suitable position, the locking mechanism 8 only needs to be released to lock the front cap shell 2 and the rear cap shell 1 with each other. The present invention has a simple structure and is easy to adjust.

[0043] The first embodiment of the locking mechanism 8 of the present invention comprises a positioning rack 81 arranged on at least one side of the slide rail 5, a plurality of positioning tooth grooves 82 are evenly spaced on the positioning rack 81, a vertical notch 83 is arranged on one end of the sliding seat 6, a locking seat 84 is movably arranged in the vertical notch 83, a locking protrusion 85 capable of being inserted into the positioning tooth groove 82 is arranged at a position corresponding to the locking seat 84 and the positioning rack 81, and a locking protrusion 85 capable of being inserted into the positioning tooth groove 82 is movably arranged on the sliding seat 6. The button 86 is provided with a first pressing spring 860 between the locking seat 84 and the vertical notch 83, a spring groove 87 is provided in the lower end surface of the locking seat 84, the upper end of the first pressing spring 860 is arranged in the spring groove 87, and the lower end of the first pressing spring 860 presses on the bottom surface of the vertical notch 83; the upper end of the locking seat 84 presses on the lower end surface of the button 86, and an elastic member 88 is provided in the middle of the sliding seat 6, the middle part of the elastic member 88 protrudes outward and is stuck in the positioning tooth groove 82. In the present invention, when the button 86 is pressed, the button 86 squeezes the upper end of the locking seat 84, so that the locking seat 84 overcomes the elastic force of the first pressing spring 860 and moves, thereby driving the locking protrusion 85 to move downward and disengage from the positioning tooth groove 82; at this time, the sliding seat 6 can slide relative to the slide rail 5. In the present invention, a partition 89 is provided between the two positioning tooth grooves 82, and an introduction arc surface 810 is provided on both sides of the partition 89. When the sliding seat 6 slides, the elastic member 88 is squeezed by the partition 89 and deformed, so that it can be separated from the positioning tooth groove 82, and after passing the partition 89, it will be elastically reset; over and over again, the outer protrusion 811 in the middle of the elastic member 88 collides with the positioning rack 81, so that a clicking sound is produced. The user can understand the distance moved by the sliding seat 6 according to the number of clicking sounds, so that the two adjustments can be consistent.

[0044] In the present invention, a first accommodating cavity 10 is provided in the sliding seat 6, a through hole 11 is provided on the side wall of the sliding seat 6 corresponding to the positioning tooth groove 82, and the elastic member 88 is provided in the first accommodating cavity 10, and the outer protrusion 811 of the elastic member 88 passes through the through hole 11 and is clamped in the positioning tooth groove 82. In the present invention, the elastic member 88 is an elastic sheet, the middle part of the elastic sheet is arched and an outer protrusion 811 that can pass through the through hole 11 is provided in the middle part, the outer walls on both sides of the outer protrusion 811 press against the two side walls of the through hole 11, and arc-shaped warped portions 12 are provided at both ends of the elastic sheet, and the arc-shaped warped portions 12 press against the inner wall of the first accommodating cavity 10. When the outer protrusion 811 is pressurized, the outer protrusion 811 will move toward the inside of the first accommodating cavity 10, the elastic sheet will be deformed under pressure, and the arc-shaped curved portions 12 on both sides will move to both sides, so that the outer protrusion 811 can shrink toward one side of the first accommodating cavity 10, thereby disengaging from the positioning tooth groove 82.

[0045] In the present invention, a limiting slide groove 13 is respectively arranged on both sides of the sliding seat 6, and a limiting buckle 14 is arranged at a position corresponding to the button 86 and the limiting slide groove 13, and the limiting buckle 14 is movably arranged in the limiting slide groove 13. In the present invention, a positioning convex edge is arranged on the upper part of the limiting slide groove 13 to prevent the limiting buckle 14 from being separated. The limiting buckle 14 and the limiting slide groove 13 cooperate with each other, so that the movement process of the button 86 is more stable.

[0046] The second embodiment of the locking mechanism 8 of the present invention is based on the first embodiment, and an anti-mispress mechanism 15 is provided between the button 86 and the sliding seat 6 to prevent the button 86 from being accidentally pressed, thereby causing the locking mechanism 8 to be unlocked. In the present invention, the anti-mispress mechanism 15 can effectively prevent the button 86 from being accidentally pressed, thereby avoiding accidents.

[0047] The anti-mispress mechanism 15 of the present invention includes a limiting column 151 arranged in the middle part of the lower side surface of the button 86, a vertical accommodating groove 152 is provided at the position corresponding to the sliding seat 6 and the limiting column 151, a second accommodating cavity 153 is provided in the sliding seat 6, two partitions 154 are arranged in the second accommodating cavity 153, a transverse slot 155 is provided in the partition 154, a limiting plate 156 is movably arranged in the transverse slot 155, a yielding groove 157 is provided at the position corresponding to the limiting plate 156 and the limiting column 151, the outer end of the limiting plate 156 extends out of the sliding seat 6 and is connected to the unlocking button 159 through a connecting piece 158, and a positioning protrusion 1510 is provided on one side of the inner end of the limiting plate 156 to prevent the limiting plate 156 from escaping from the transverse slot 155. In the present invention, when the unlock button 159 abuts against one end of the key 86, the clearance groove 157 and the limiting column 151 are mutually misaligned. At this time, the limiting column 151 abuts against the limiting plate 156, and the key 86 cannot be pressed down, thereby effectively preventing accidental pressing due to collision during use, ensuring that there is no looseness between the rear cap shell 1 and the rear front cap shell 2, thereby avoiding accidents. When adjustment is required, the unlock button 159 needs to be pushed first to separate it from the key 86; at this time, the positioning protrusion 1510 abuts against the partition 154, and the clearance groove 157 is located directly below the limiting column 151, and the key 86 can be pressed. In this embodiment, the length of the assembly slot 7 is greater than the sum of the length of the unlock button 159 and the length of the key 86.

[0048] The third embodiment of the locking mechanism 8 of the present invention comprises a positioning rack 81 respectively arranged on both sides of the slide rail 5, a plurality of positioning tooth grooves 82 are evenly spaced on the positioning rack 81, a positioning card strip 812 is arranged in the sliding seat 6, both ends of the positioning card strip 812 are respectively arranged in the positioning tooth grooves 82, and spring pieces 813 are respectively arranged on the lower ends of both sides of the positioning card strip 812, and the sliding seat 6 is respectively provided with plug-in slots 814 on both sides along the sliding direction, and the two ends of the spring piece 813 are respectively arranged on the plug-in slots 814. In the connecting slot hole 814, two mounting seats 815 are arranged at intervals in the sliding seat 6, and a guide hole 816 is arranged in the mounting seat 815. A driving seat 817 is arranged in the sliding seat 6 between the two mounting seats 815, and arc-shaped extrusion heads 818 are symmetrically arranged at positions corresponding to the driving seat 817 and the positioning strip 812, and a guide column 819 is arranged at positions corresponding to the driving seat 817 and the guide hole 816. The guide column 819 is movably arranged in the guide hole 816, and a push plate 820 is provided at the upper end of the driving seat 817. The sliding seat 6 in the present invention includes a bottom plate 61, a central long groove 62 is provided in the lower end surface of the bottom plate 61 along the length direction, an inner concave transverse groove hole 63 is provided in the middle of the lower end surface of the bottom plate 61, which is perpendicular to and connected to the central long groove 62, and a return-shaped boss 64 is provided in the middle of the upper end surface of the bottom plate 61, the mounting seat 815 is arranged in the return-shaped boss 64, and a receiving groove 65 is provided at a position corresponding to the positioning card strip 812 on the lower end surface of the return-shaped boss 64; in the present invention, an elastic strip 9 is provided on one side of the bottom plate 61. By providing the elastic strip 9, the assembly between the bottom plate 61 and the slide rail 5 is more stable, ensuring that there is no shaking during the moving process. An introduction arc groove 67 is provided on the bottom plate 61 on one side of the inner concave transverse groove hole 63, and the introduction arc groove 67 allows the spring piece 813 to be easily inserted into the plug-in slot 814.

[0049] The positioning card strip 812 described in the present invention is an "n" type positioning card strip. When the sliding seat 6 needs to be moved, the push plate 820 is pushed, and the driving seat 817 will drive the arc-shaped extrusion head 818 to move. The arc-shaped extrusion head 818 squeezes the positioning card strip 812 to move it downward and out of the positioning tooth groove 82. At this time, the sliding seat 6 can move in the slide rail 5. When the locking mechanism 8 is in a locked state, even if the rear cap shell 1 or the front cap shell 2 is pushed, the positioning card strip 812 will not move downward because the positioning card strip 812 and the positioning tooth groove 82 are subjected to a lateral force, so it can be stably locked. In the present invention, a plurality of connecting ridges 66 are arranged at intervals on the outer wall of the return-shaped boss 64, and a connecting groove is arranged at a position corresponding to the connecting ridge 66 on the extended connecting portion 4, and the connecting ridge 66 is arranged in the connecting groove.

[0050] The fourth embodiment of the locking mechanism 8 of the present invention is based on the third embodiment. In addition, an anti-mis-push mechanism 16 is provided in the driving seat 817 to prevent the push plate 820 from being pushed by mistake. The anti-mis-push mechanism 16 includes a long hole groove 60 provided in the bottom of the sliding seat 6, and a plurality of positioning card grooves 161 are evenly distributed on both sides of the long hole groove 60 along the length direction. A central slot hole 162 is provided in the middle of the push plate 820 and the middle of the driving seat 817, and a pressing plate 163 is provided in the central slot hole 162. At the center position of the lower end surface of the pressing plate 163, a positioning card groove 161 is provided. A center column 164 is provided, a center hole 165 is provided at the center position of the driving seat 817, a waist-shaped hole 166 is provided on the positioning clamping strip 812 along the length direction of the slide rail 5, the center column 164 passes through the center hole 165, the waist-shaped hole 166 and the long hole slot 60 in sequence, a positioning clamping block 167 is provided at the lower end of the center column 164 at a position corresponding to the positioning clamping slot 161, the positioning clamping block 167 is clamped in the positioning clamping slot 161, and a second pressing spring 168 is provided on the outer sleeve of the center column 164 between the bottom of the center slot hole 162 and the bottom surface of the pressing plate 163. In the present invention, under the action of the second pressing spring 168, the pressing plate 163 will drive the positioning clamping block 167 at the lower end of the center column 164 to clamp upward in the positioning clamping slot 161, at which time, the push plate 820 is locked and cannot move forward and backward. In this embodiment, a first arc groove 169 is provided on the upper surface of one end of the pressing plate 163, and a second arc groove 1610 is provided on the side of the push plate 820 corresponding to the first arc groove 169. By providing the first arc groove 169 and the second arc groove 1610, it is convenient for the user to press the pressing plate 163 and push the push plate 820 at the same time. The present invention provides a waist-shaped hole 166 on the positioning card strip 812, so that the center column 164 can move smoothly without being blocked during the forward and backward movement of the push plate 820, and does not hinder the positioning card strip from moving downward. In the present invention, the anti-mis-push mechanism 16 can effectively prevent the push plate 820 from being pushed by mistake during the use of the helmet, and avoid the rear cap shell 1 and the front cap shell 2 from separating from each other, which may cause accidents.

[0051] The present invention provides an auxiliary locking mechanism 17 between the upper end surface of the rear cap shell 1 and the upper end surface of the front cap shell 2. The auxiliary locking mechanism 17 includes a configuration slot 171 provided in the upper end surface of the rear cap shell 1, hinge holes are provided on both sides of the configuration slot 171, a locking plate 172 is provided in the configuration slot 171, a hinge shaft 173 is provided at a position corresponding to the hinge hole of the locking plate 172, and the hinge shaft 173 is provided in the hinge hole, a plurality of clamping transverse slots 174 are evenly provided on the upper part of the front cap shell 2, a clamping horizontal bar 175 is provided at a position corresponding to the clamping transverse slot 174 of the locking plate 172, and a pulling protrusion 176 for facilitating opening of the locking plate 172 is provided on the front side of the upper end surface of the locking plate 172.

[0052] When the helmet needs to be adjusted in the present invention, the pulling protrusion is first pushed to rotate the locking plate 172 around the hinge shaft 173, and the engaging horizontal bar 175 is disengaged from the engaging horizontal slot hole 174 of the front cap shell 2 as the locking plate 172 flips; then, the helmet can be quickly adjusted through the unlocking mechanisms 9 on both sides.

[0053] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A helmet that is easy to adjust in size, comprising a rear cap shell (1), wherein a front cap shell (2) is arranged inside the rear cap shell (1) and is movable forward and backward relative to the rear cap shell (1), wherein: Accommodating grooves (3) are respectively provided on both sides of the rear cap shell (1); an extended connecting portion (4) is provided at a position corresponding to the accommodating groove (3) on the front cap shell (2); a slide rail (5) is fixedly arranged in the accommodating groove (3); a sliding seat (6) is provided in the slide rail (5); an assembly slot (7) is provided on the extended connecting portion (4); the sliding seat (6) is assembled in the assembly slot (7); and a locking mechanism (8) that can be unlocked when pressed is provided between the slide rail (5) and the sliding seat (6).

2. A size-adjustable helmet according to claim 1, characterized in that: The locking mechanism (8) comprises a positioning rack (81) arranged on at least one side of the slide rail (5), a plurality of positioning tooth grooves (82) are evenly spaced on the positioning rack (81), a vertical notch (83) is provided on one end of the sliding seat (6), a locking seat (84) is movably arranged in the vertical notch (83), a locking protrusion (85) capable of being inserted into the positioning tooth groove (82) is provided at a position corresponding to the positioning rack (81) on the locking seat (84), a button (86) capable of being moved up and down relative to the sliding seat (6) is movably arranged on the sliding seat (6), and a locking protrusion (85) capable of being inserted into the positioning tooth groove (82) is provided at a position corresponding to the positioning rack (81) on the locking seat (84). A first pressing spring (860) is provided between the locking seat (84) and the vertical slot (83); a spring slot (87) is provided in the lower end surface of the locking seat (84); the upper end of the first pressing spring (860) is arranged in the spring slot (87); the lower end of the first pressing spring (860) presses against the bottom surface of the vertical slot (83); the upper end of the locking seat (84) presses against the lower end surface of the button (86); an elastic member (88) is provided in the middle of the sliding seat (6); the middle part of the elastic member (88) protrudes outward and is clamped in the positioning tooth groove (82).

3. A size-adjustable helmet according to claim 2, characterized in that: A first accommodating cavity (10) is provided in the sliding seat (6), a through hole (11) is provided on a side wall of the sliding seat (6) corresponding to the positioning tooth groove (82), the elastic member (88) is arranged in the first accommodating cavity (10), and an outer protrusion (811) of the elastic member (88) passes through the through hole (11) and is clamped in the positioning tooth groove (82).

4. The size-adjustable helmet according to claim 1, characterized in that: Limiting slide grooves (13) are respectively arranged on both sides of the sliding seat (6), and limiting buckles (14) are arranged at positions corresponding to the button (86) and the limiting slide grooves (13), and the limiting buckles (14) are movably arranged in the limiting slide grooves (13).

5. A size-adjustable helmet according to any one of claims 2 to 4, characterized in that: An anti-mis-press mechanism (15) is provided between the button (86) and the sliding seat (6) to prevent the button (86) from being mis-pressed, thereby causing the locking mechanism (8) to be unlocked.

6. A helmet with easily adjustable size according to claim 5, characterized in that: The anti-mispress mechanism (15) comprises a limiting column (151) arranged in the middle of the lower side surface of the button (86); a vertical accommodating groove (152) is provided at a position corresponding to the sliding seat (6) and the limiting column (151); a second accommodating cavity (153) is provided in the sliding seat (6); two partitions (154) are arranged in the second accommodating cavity (153); a transverse slot (155) is provided in the partition (154); a limiting plate (156) is movably arranged in the transverse slot (155); a clearance groove (157) is provided at a position corresponding to the limiting plate (156) and the limiting column (151); an outer end of the limiting plate (156) extends out of the sliding seat (6) and is connected to the unlocking button (159) through a connecting piece (158); and a positioning protrusion (1510) is provided on one side of the inner end of the limiting plate (156) to prevent the limiting plate (156) from being separated from the transverse slot (155).

7. The size-adjustable helmet according to claim 1, characterized in that: The locking mechanism (8) comprises positioning racks (81) respectively arranged on both sides of the slide rail (5), a plurality of positioning tooth grooves (82) are evenly spaced on the positioning racks (81), a positioning clip (812) is provided in the sliding seat (6), both ends of the positioning clip (812) are respectively arranged in the positioning tooth grooves (82), spring sheets (813) are respectively provided at the lower ends of both sides of the positioning clip (812), plug-in slots (814) are respectively provided on both sides of the sliding seat (6) along the sliding direction, both ends of the spring sheet (813) are respectively arranged in the plug-in slots (814), and the positioning clip (813) is respectively provided in the positioning clip (814). Two mounting seats (815) are arranged at intervals in the sliding seat (6), a guide hole (816) is arranged in the mounting seats (815), a driving seat (817) is arranged in the sliding seat (6) between the two mounting seats (815), arc-shaped extrusion heads (818) are symmetrically arranged at positions corresponding to the driving seats (817) and the positioning clamping strip (812), a guide column (819) is arranged at positions corresponding to the driving seats (817) and the guide hole (816), the guide column (819) is movably arranged in the guide hole (816), and a push plate (820) is arranged at the upper end of the driving seat (817).

8. The size-adjustable helmet according to claim 7, characterized in that: An anti-mis-push mechanism (16) is provided in the driving seat (817) to prevent the push plate (820) from being pushed by mistake. The anti-mis-push mechanism (16) includes a long hole groove (60) provided in the bottom of the sliding seat (6), and a plurality of positioning clamping grooves (161) are evenly distributed on both sides of the long hole groove (60) along the length direction. A central slot hole (162) is provided in the middle of the push plate (820) and the middle of the driving seat (817), and a pressing plate (163) is provided in the central slot hole (162). A central column (164) is provided at the central position of the lower end surface of the pressing plate (163). A center hole (165) is provided on the positioning clip strip (812), a waist-shaped hole (166) is provided along the length direction of the slide rail (5), the center column (164) passes through the center hole (165), the waist-shaped hole (166) and the long hole groove (60) in sequence, a positioning clip block (167) is provided at the lower end of the center column (164) at a position corresponding to the positioning clip groove (161), the positioning clip block (167) is clamped in the positioning clip groove (161), and a second pressing spring (168) is provided on the outer sleeve of the center column (164) between the bottom of the center slot hole (162) and the bottom surface of the pressing plate (163).

9. The size-adjustable helmet according to claim 7, characterized in that: An auxiliary locking mechanism (17) is provided between the upper end surface of the rear cap shell (1) and the upper end surface of the front cap shell (2).

10. The size-adjustable helmet according to claim 9, characterized in that: The auxiliary locking mechanism (17) comprises a configuration slot hole (171) arranged in the upper end surface of the rear cap shell (1), hinge holes are respectively arranged on both sides of the configuration slot hole (171), a locking plate (172) is arranged in the configuration slot hole (171), a hinge shaft (173) is arranged at a position corresponding to the hinge hole of the locking plate (172), and the hinge shaft (173) is arranged in the hinge hole, a plurality of clamping transverse slot holes (174) are evenly arranged on the upper part of the front cap shell (2), a clamping transverse bar (175) is arranged at a position corresponding to the clamping transverse slot hole (174) of the locking plate (172), and a pulling protrusion (176) for facilitating opening of the locking plate (172) is provided on the front side of the upper end surface of the locking plate (172).

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