CN203618852U

CN203618852U - Head size adjustment device for safety helmet

Info

Publication number: CN203618852U
Application number: CN201320856798.0U
Authority: CN
Inventors: 江文才
Original assignee: DONGGUAN YIPEI SPORTS EQUIPMENT Co Ltd
Current assignee: DONGGUAN YIPEI SPORTS EQUIPMENT Co Ltd
Priority date: 2013-12-23
Filing date: 2013-12-23
Publication date: 2014-06-04
Anticipated expiration: 2023-12-23

Abstract

The utility model relates to a head size adjustment device for a safety helmet. According to the head size adjustment device, adjustment operation is easy and convenient and fixing is firm. The head size adjustment device comprises a body and a concave chamber formed in the body. An annular belt body is provided with a first end and a second end and passes through the concave chamber. A gear section, a finger section and a shoulder section are formed in the first end and the second end respectively. The concave chamber is provided with a controller and a gear arranged on the controller. The gear is meshed with the gear section of the belt body. The controller rotates and adjusts the position of the belt body to fix the head size. According to the head size adjustment device, the problems that an adjustment structure slides easily, the position of the belt body can not be adjusted really and the belt body is separated from the adjustment structure are solved.

Description

The head circumference adjusting device of safety cap

Technical field

The present invention relates to a kind of head circumference adjusting device of safety cap; Be particularly related to finger, the shoulder of a kind of body alcove and belt body, coordinate the combination of controller, form the head circumference adjusting device of the safety cap of certain, stable corrective action.

Background technology

Apply molded closely sealed being fixed in a vacuum forming device of plastic casing material for safety cap embryo, coordinating a foaming and intumescing material to penetrate fills, make this plastic casing material be coated foaming and intumescing material through heating operation, and complete a helmet structure, providing personnel to wait and wear, is prior art.Known safety cap inside is all fitted with can be for hoop or the belt body of adjusting head circumference size, is used for safety cap to be fixed on wearer's head; For example, US2006/0225187A1 " SPORTS HELMET " (, No. 94205491st, Taiwan " the sporting safeguard protection helmet " Patent Case), has been to provide a typical embodiment.

Described embodiment is respectively equipped with tooth section and a lower tooth section on one in the microscler blind hole at (head circumference) belt body two ends; In the time of the forward and backward overlapping housing that packs adjusting device into of belt body two end regions, jointly define a long hole shape tooth district, the gear of engagement one rotating disk.When the adjustment knob on roll-shell, can drive the gear actuation annular tooth district of rotating disk, adjust contraction or the pine oil of belt body, according to wearers head, determine this head circumference size.

One about above-described embodiment operation and structural design aspect problem be, in order to make belt body two end regions (front, overlapping afterwards) insert smoothly housing, the size of housing can obviously be greater than overlapping thickness or the size of belt body two end regions, this can allow belt body two end regions easily produce in housing, the situation of lower displacement, cause the structure in the long hole shape tooth district that on this, tooth section and lower tooth section define jointly uncertain, make, the engagement of lower tooth section and disk gear is unstable, and in the time of operation dial rotation, produce the situation of sliding or sliding tooth, cannot really adjust and fixed band body position.

In order to improve said circumstances, prior art has also disclosed a kind of adjusted size structure of head circumference belt body of safety cap; For example, US8370967B2 " ADJUSTABLE HEAD BAND FOR A HELMET " Patent Case, has been to provide a feasible embodiment.This embodiment makes belt body two end regions form respectively tooth section and lower tooth section; Insert after housing according to upper and lower position when them, the projection of mat enclosure interior is pushed down this upper and lower tooth section, limits upper and lower tooth section and produces the situation of upper and lower displacement.Therefore, the fixed long hole shape tooth district of this upper and lower tooth segment limit is certain and stable structure.

But, just as the prior art that those are known, in order to allow that region, belt body two ends can relative displacement form contraction or pine oil in response to rotating disk adjustment, two end regions of belt body are not the structures linking together; Described structure kenel allows user in the time of operation (operation of belt body pine oil), easily, because of operation careless mistake, the situation that belt body two end regions are deviate from housing or adjusting device occurs; And that this situation is not for we is desired.

Representational, these reference datas have shown at relevant safety cap head circumference belt body and adjusting device or its relevant coupling unit, the situation aspect use and structural design.If the respective outer side edges kenel of this belt body and adjusting device is considered in overline design, and above-mentioned application scenarios, it is different from and practises user, can change its use kenel, and be different from old law; In fact, also can increase its effect and the simplicity of operating aspect.

If attempt improves or overcomes the above-mentioned problem that we discuss, we find that the relevant coupling unit of this belt body and adjusting device or its must consider following problem aspect structural design and operating technology:

1. should remove prior art and make the structure kenel of the housing of the forward and backward overlapping insertion adjusting device of belt body two end regions, the error coordinating to reduce belt body two end regions and housing, causes the situation of the uncertain or sliding tooth of adjustment.

2. inventor provides and is different from the adjusting device of prior art and the fit structure of belt body, solves prior art because of manual operation careless mistake simultaneously, causes belt body to deviate from the situation of adjusting device.

Utility model content

Main purpose of the present utility model is to provide a kind of head circumference adjusting device of safety cap, provides adjustment operation the easy and fixing effect such as really.This adjusting device comprises a body and is formed on the alcove on body; One annular belt body has first end and the second end, reciprocating by this alcove; This first end and the second end form respectively a tooth section, a finger and a shoulder.And alcove is fitted with a controller and is arranged on the gear on controller, the tooth section engagement of described gear and belt body; And via controller rotates adjusts band body position, to stipulate head circumference size.Improve existing adjustment structure and easily produce slip, can not really adjust band body position and belt body and depart from situations such as adjusting structure.

According to the head circumference adjusting device of the utility model safety cap, this alcove comprises a sidewall and a bottom; Sidewall is formed with corresponding slotted eye, allows that the first end of belt body and the second end pass through.And this body is provided with a track, stipulate out the motion path of belt body two end regions.

Wherein, the finger height of this belt body is greater than the height of tooth section, makes belt body because adjustment operation is along above-mentioned motion path displacement, while arriving alcove sidewall, is blocked by a stop being formed on sidewall in finger, stops belt body to deviate from body because of manual operation careless mistake.

Wherein, this controller includes the gear of at least one cantilever and engagement belt body tooth section.Cantilever is provided with a recess, pivot joint one adjustment knob, and a limiting unit in cantilevered distal end; After adjustment knob band movement controller rotates, allow limiting unit and alcove interference, form positioning action, improve the engagement of this controller gear and belt body tooth section.

Accompanying drawing explanation

Fig. 1 is the perspective view that the utility model adjusting device and a cap body coordinate;

Fig. 2 is the STRUCTURE DECOMPOSITION schematic diagram of the utility model adjusting device;

Fig. 3 is the STRUCTURE DECOMPOSITION schematic diagram of another angle of the utility model adjusting device; Describe the structure configuration scenario of body;

Fig. 4 is a planar structure schematic diagram of the present utility model; Show the cooperation situation of controller and body alcove.

Fig. 5 is an operation embodiment schematic diagram of the present utility model; Describe adjustment knob band movement controller and rotated, the case of motion of cantilever.

Fig. 6 is the body of the utility model adjusting device and an operation embodiment schematic diagram of belt body; Describe the situation that belt body shoulder and body coordinate.

Fig. 7 is another operation embodiment schematic diagram of the present utility model; Show that adjustment knob band movement controller rotates towards other direction, the case of motion of cantilever.

Fig. 8 is the body of the utility model adjusting device and another operation embodiment schematic diagram of belt body; Describe the situation that belt body finger and body stop coordinate.

Label declaration:

10 bodies; 11 alcoves; 12 sidewalls; 13 bottoms; 14 tooth portions; 15 slotted eyes; 15a the first slotted eye; 15b the second slotted eye; 15c the 3rd slotted eye; 15d the 4th slotted eye; 16 entrances; 16a groove hole; 17 first tracks; 17a, 18a stop part; 17b, 18b stop; 18 second tracks; 19 holes; 20 belt bodies; 21 first ends; 21a, 22a tooth section; 21b, 22b finger; 21c, 22c shoulder; 22 second ends; 23,24 inclined-planes; 30 controllers; 31 axis holes; 32 cantilevers; 33 gears; 34 recesses; 35 limiting units; 35a first surface; Second of 35b; 40 back of the body lids; 41 claws; 42 abaculus; 43 first tracks; 43a, 44a stop part; 44 second tracks; 50 secondary lids; 70 adjustment knobs; 71 axles; 72 press portion; 73 fixtures; 80 cap bodies; 81 combination bore; 90 adjusting devices.

The specific embodiment

By describing technology contents of the present utility model, structural feature in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.

Refer to Fig. 1, Fig. 2 and Fig. 3, the head circumference adjusting device of the utility model safety cap comprises the combination of a cap body and an adjusting device, generally represents with Ref. No. 80,90 respectively; In practice, adjusting device 90 is fitted in cap body 80 inside, in order to adjust the head circumference size of cap body 80, provides personnel to wear.Cap body 80 is provided with a combination bore 81, and the movable combined hat body 80 of an adjustment knob 70 and the adjusting device 90 of adjusting device 90 is provided.

In adopted embodiment, adjusting device 90 comprises a body 10; Body 10 is structures of a rectangular housing, and two ends are provided with entrance 16, enters body 10 for a belt body 20.In figure, also describe the alcove 11 that body 10 is provided with a circular profile; This alcove 11 comprises a sidewall 12 and a bottom 13; And sidewall 12 inner faces of alcove 11 are formed with plurality of pins portion 14, be used for and controller 30 generation interference (this part also can be narrated hereinafter).

Fig. 3 has shown that sidewall 12(approaches bottom 13) position be formed with corresponding slotted eye 15, to allow that belt body 20 is by alcove 11.Specifically,, according to the reference position of the 3rd figure, slotted eye 15 comprises first and second slotted eye 15a, the 15b of position at alcove 11 upper positions, and position is at third and fourth slotted eye 15c, the 15d of alcove 11 lower positions.In adopted embodiment, between entrance 16 and first and second slotted

eye

15a, 15b, body 10 is provided with the first track 17; And between entrance 16 and third and fourth slotted

eye

15c, 15d, body 10 is provided with the second track 18.The first track 17 and the second track 18 are the motion paths for regulation belt body 20.And the first track 17 and the second track 18 are respectively arranged with a

stop part

17a, 18a, position is on the motion path of belt body 20.

In a preferred embodiment, position is on the motion path of belt body 20, and the first track 17 and the second track 18 are also provided with a

stop

17b, 18b, are formed on alcove sidewall 12.

Stop

17b, 18b stop belt body 20 to deviate from body 10.

Please refer to Fig. 2, Fig. 3, this belt body 20 is kenels of a circular contour; There is first end 21 and the second end 22, reciprocating by this alcove 11.Specifically, first end 21 and the second end 22 are compositions from and the upper and lower kenel changing mutually.First end 21 is to enter body 10 from entrance 16, enters alcove 11 along the first track 17 through the first slotted eye 15a, then by the second slotted eye 15b; The second end 22 is to enter body 10 from another entrance 16, enters alcove 11 along the second track 18 through the 3rd slotted eye 15c, then by the 4th slotted eye 15d.

In figure, show that this first end 21 and the second end 22 form respectively a

tooth section

21a, 22a, a

connection teeth section

21a, 22a,

position finger

21b, 22b and shoulder 21c, a 22c in

finger

21b, 22b opposite location endways.Described

tooth section

21a, 22a is the rotation that coordinates controller 30, and drives belt body 20 displacements, adjusts head circumference size; This

finger

21b, 22b and

shoulder

21c, 22c are the range of movement that limits belt body 20.

Fig. 2, Fig. 3 have also described a back of the body and have covered 40, are used for the situation of combined closing body 10.It is rectangular plate-like body structures of identical body 10 profiles that the back of the body covers 40, is provided with claw 41 and the position abaculus 42 at two ends.Claw 41 is to embed a hole 19 being formed on alcove bottom 13; Abaculus 42 is groove hole 16a that embedding one is located at body 10 two ends.

The structure of the first track 17, the second track 18 and stop part 17a, the 18a of corresponding body 10, preferably, the back of the body cover 40 and is also provided with the first track 43, the second track 44 and stop

part

43a, 44a, make to carry on the back cover 40 and body 10 form the kenel of airtight cooperation.Feasible, the back of the body covers 40 and is also combined with a secondary lid 50.

In the embodiment adopting at the utility model, this controller 30 is to be fitted in alcove 11 the insides.Controller 30 is pans, is provided with an axis hole 31, coordinates an axle 71 and the fixture 73 of adjustment knob 70.

Combine.Controller 30 includes the gear 33 of at least one cantilever 32 and engagement belt body tooth section 21a, 22a.In figure, show that controller 30 has the structure of two cantilevers 32 of symmetrical kenel.And cantilever 32 has an elastic movement scope.

In preferred embodiment, cantilever 32 is provided with a recess 34 and a limiting unit 35 at cantilever 32 ends; Limiting unit 35 is into cone structure, and comprises first surface 35a and second 35b.

Suppose take cantilever 32 Axis Extension directions as reference axis first surface 35a(angle of inclination) and the angle angle of these cantilever 32 axis be to be less than second 35b(angle of inclination) and the angle angle of these cantilever 32 axis.Therefore, the interference kenel of first surface 35a and alcove tooth portion 14, allows that controller 30 rotates in alcove 11 the insides.The interference kenel of second 35b and alcove tooth portion 14, can stop controller 30 to rotate in alcove 11 the insides, forms positioning action, improves the engagement stable state of this controller gear 33 and belt body tooth section 21a, 22a.Unless provided an active force to press down cantilever 32, remove the interference kenel of second 35b and alcove tooth portion 14, controller 30 could rotate.

Refer to Fig. 3, Fig. 4, this adjustment knob 70 is provided with at least one portion 72 that presses; The cantilever recess 34 of corresponding controller 30, pressing portion 72 is structures of two protruding stakes, position is on recess 34.Press the rotation that portion 72 coordinates adjustment knob 70, can press down cantilever 32 cantilever limiting unit 35 alcove tooth portions 14

Please refer to Fig. 5, suppose take the 2nd to describe adjustment knob 70 controllers 30 to as reference direction, when user rotates adjustment knob 70 when pressing portion's 72 controller 30 clockwises and rotating, cantilever limiting unit 35 first surface 35a chamber tooth portions 14 relate to kenel, allow controller 30; Make gear 33 belt

body tooth section

21a, 22a along the first track 17 and the second track 18 relative displacements, dwindle gradually the head circumference size that belt body 20 forms respectively.

Fig. 6 has shown especially in the time that shoulder 21c, the 22c of belt body first end 21, the second end 22 arrive respectively stop part 17a, the 18a of body the first track 17, the second track 18, stop

part

17a, 18a stop belt body 20 to continue displacement, and reach the minimum dimension that belt body 20 head circumferences are adjusted.

Refer to Fig. 7, when user rotates adjustment knob 70, when making to press portion 72 and being with movement controller 30 counterclockwise to rotate, the portion that presses 72 of adjustment knob 70 presses down cantilever 32 gradually, make second 35b of cantilever limiting unit 35 leave alcove tooth portion 14, and the interference state of second 35b of releasing and tooth portion 14 forces controller 30 to rotate.Therefore, controller gear 33 drives belt

body tooth section

21a, 22a respectively along the first track 17 and the second track 18 relative displacements, expands gradually the head circumference size that belt body 20 forms.

Fig. 8 has described especially in the time that finger 21b, the 22b of belt body first end 21, the second end 22 arrive respectively stop 17b, the 18b of alcove 11, and stop 17b, 18b stop belt body 20 to continue displacement, and reach the full-size that belt body 20 head circumferences are adjusted.

In one is preferably considered, suppose that direction take the 8th figure is as reference direction, position has one to the elasticity or the active force that move below in figure at the finger 21b of belt body first end 21 ends; Position has elasticity or an active force to motion above in figure at the finger 22b of belt body the second end 22 ends.This contributes to make

finger

21b, 22b in the time arriving

alcove stop

17b, 18b, can produce more certain interference barrier effect with

stop

17b, 18b, guarantees belt body 20 to remain on body 10 the insides.

In a preferred embodiment, this

belt body finger

21b, 22b have an inclined-

plane

23,24; Described inclined-plane the 23, the 24th, allows respectively belt body first end 21 enter alcove 11 from the first slotted eye 15a smoothly, then by the second slotted eye 15b; The second end 22 enters alcove 11 from the 3rd slotted eye 15c, then by the 4th slotted eye 15d.

Must be illustrated, stop 17b, the 18b on this alcove sidewall 12 connects respectively alcove the first slotted eye 15a and the 4th slotted eye 15d.And, the first slotted eye 15a(or the 4th slotted eye 15d) height on a vertical axis is slightly larger than belt body tooth section 21a(or 22a) height (that is, tooth root is to the length of crown), but be less than belt body finger 21b(or 22b) height.Therefore, as belt body finger 21b(or 22b) displacement is while arriving alcove 11, can be stopped the 17b(of portion or 18b) stop, and can not deviate from body 10.

Representational, the head circumference adjusting device of this safety cap is possessing under the condition that has easy and simple to handle and positioning action, compared to old law, is to have following consideration condition and advantage:

1. the cooperation kenel of this body 10 and belt body 20, controller 30 and associated component structure, is considered by overline design, comprise: body 10 arranges alcove 11, tooth portion 14, coordinates controller 30 that cantilever 32 and limiting unit 35 are set, body 10 configures first, two

tracks

17, 18, alcove 11 forms the first～tetra-slotted eye 15a～15d and stop 17b, 18b, coordinates belt body 20 that finger 21b is set, 22b etc. part, is obviously different from (1) prior art (for example, US2006/0225187) and makes belt body two end regions (microscler blind hole arranges respectively, lower tooth section) front, adjusting device is inserted in rear overlapping, rotating disk arranges hook part and is formed on the projection on hook part, coordinate adjustment knob that protruded stigma is set, move around hook part, structure kenel and (2) prior art (for example, US8370967B2) of forcing projection to leave the housing ratchet of adjusting device make belt body two end regions according to upper, upper/lower positions inserts after housing, and the projection of mat enclosure interior is pushed down the upper of these belt body two end regions, lower tooth section, coordinates rotating disk periphery that ratchet and the adjustment knob of tooth portion combination cap are set, and carries out the structure kenel of adjusting with body position.

2. this adjusting device 90 makes belt body 20 be limited in the first track 17, the second track 18 top offsets or motion, coordinate alcove 11, the first～tetra-slotted eye 15a～15d, make belt

body tooth section

21a, 22a and controller gear 33 form the fit structure of stablizing certain engagement, make belt body two end regions of prior art and the error that housing coordinates, allow the microscler blind hole of belt body two end regions produce in housing, lower displacement, cause the structure in the long hole shape tooth district jointly defining uncertain, unstable with the engagement of disk gear, and in the time of operation dial rotation, produce the situation of sliding or sliding tooth, cause the situations such as the uncertain and certain fixed band of adjustment body position, also all obtain significantly and improve.

3. this adjusting device 90 makes alcove 11

form stop

17b, 18b, coordinate belt body 20 that the fit structure of

finger

21b, 22b is set, also (for example solved prior art simultaneously, US8370967B2) two end regions of application belt body are not the structures linking together, insert housing according to upper and lower position, in the time that user operates the operation of belt body pine oil, easily because of manual operation careless mistake, there is the situation that belt body two end regions are deviate from housing or adjusting device.

The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims

1. a head circumference adjusting device for safety cap, is characterized in that, this adjusting device comprises:

One body and be formed on the alcove on body; Alcove comprises a sidewall and a bottom; The side wall inner surface of alcove is formed with plurality of pins portion;

One belt body has first end and the second end, can pass through this alcove; This first end and the second end form respectively a tooth section, a connection teeth section, position finger and a shoulder in finger opposite location endways; The height of this finger is greater than the height of this tooth section; And

Alcove is fitted with a controller, can produce and interfere with alcove tooth portion; Controller has the gear of at least one cantilever and engagement belt body tooth section; And via controller rotates adjusts band displacement body.

2. the head circumference adjusting device of safety cap according to claim 1, is characterized in that, wherein this body is the structure of a rectangular housing, and two ends are provided with entrance, enters body for belt body; And alcove sidewall is formed with slotted eye, to allow that belt body passes through alcove.

3. the head circumference adjusting device of safety cap according to claim 2, is characterized in that, wherein this slotted eye comprises position first and second slotted eye at alcove upper position, and position is at third and fourth slotted eye of alcove lower position.

4. the head circumference adjusting device of safety cap according to claim 2, is characterized in that, wherein this body, between entrance and slotted eye, is provided with the first track and the second track; The first track and the second track are the motion paths of regulation belt body;

The first track and the second track are respectively arranged with a stop part, and position is on the motion path of belt body; And position on the motion path of belt body, the first track and the second track are respectively equipped with a stop, are formed on alcove sidewall.

5. the head circumference adjusting device of safety cap according to claim 3, is characterized in that, wherein this body, between entrance and first and second slotted eye, is provided with the first track;

Between entrance and third and fourth slotted eye, be provided with the second track; The first track and the second track are the motion paths of regulation belt body;

6. the head circumference adjusting device of safety cap according to claim 5, is characterized in that, wherein this belt body is the structure of a circular contour; First end and the second end be composition from and the upper and lower kenel changing mutually;

This first end is to enter body from entrance, enters alcove along the first track through the first slotted eye, then by the second slotted eye; The second end is to enter body from the entrance of the body other end, enters alcove along the second track through the 3rd slotted eye, then by the 4th slotted eye.

7. the head circumference adjusting device of safety cap according to claim 1, is characterized in that, wherein this body combination one back of the body lid;

The profile of back of the body lid and body is rectangular plate-like body structure, and back of the body lid is provided with claw and the abaculus of position at two ends; And

Claw is to embed a hole being formed on alcove bottom; Abaculus is the groove hole that embedding one is located at body two ends.

8. the head circumference adjusting device of safety cap according to claim 4, is characterized in that, wherein this body combination one back of the body lid;

The structure of the first track, the second track and the stop part of corresponding body, back of the body lid is also provided with the first track, the second track and stop part, makes back of the body lid and body form the structure of airtight cooperation.

9. the head circumference adjusting device of safety cap according to claim 5, is characterized in that, wherein this body combination one back of the body lid;

10. the head circumference adjusting device of safety cap according to claim 7, is characterized in that, wherein this back of the body lid is combined with a secondary lid.

The head circumference adjusting device of 11. safety caps according to claim 1, is characterized in that, wherein this controller is a pan, is provided with an axis hole; And

One adjustment knob is provided with an axle, is fixed part controller and adjustment knob are combined.

The head circumference adjusting device of 12. safety caps according to claim 1, is characterized in that, wherein the cantilever of this controller has an elastic movement scope;

Cantilever is provided with a recess and a limiting unit in cantilevered distal end; And

Limiting unit is into cone structure, and comprises first surface and second.

The head circumference adjusting device of 13. safety caps according to claim 11, is characterized in that, wherein the cantilever of this controller has an elastic movement scope;

Limiting unit is into cone structure, and comprises first surface and second.

The head circumference adjusting device of 14. safety caps according to claim 12, is characterized in that, wherein this controller is two cantilevers with symmetrical kenel.

The head circumference adjusting device of 15. safety caps according to claim 12, is characterized in that, wherein the angle angle of an axis of the first surface of this cantilever limiting unit and cantilever is less than the angle angle of second and this cantilever axis.

The head circumference adjusting device of 16. safety caps according to claim 13, is characterized in that, wherein this adjustment knob is provided with at least one portion that presses, and position is on recess.

The head circumference adjusting device of 17. safety caps according to claim 16, is characterized in that, wherein this portion of pressing is the structure of protruding stake.

The head circumference adjusting device of 18. safety caps according to claim 15, is characterized in that, the wherein interference kenel of the first surface of this cantilever limiting unit and alcove tooth portion allows that controller rotates.

The head circumference adjusting device of 19. safety caps according to claim 15, is characterized in that, the wherein interference kenel of second of this cantilever limiting unit and alcove tooth portion stops controller to rotate.

The head circumference adjusting device of 20. safety caps according to claim 1, is characterized in that, wherein this belt body finger has an elastic acting force.

The head circumference adjusting device of 21. safety caps according to claim 1, is characterized in that, wherein this belt body finger has an inclined-plane.

The head circumference adjusting device of 22. safety caps according to claim 4, is characterized in that, wherein the stop on this first track is to connect alcove slotted eye;

Stop on the second track is to connect alcove slotted eye; And

The height of slotted eye on a vertical axis is slightly larger than the height of belt body tooth section, is less than the height of belt body finger.

The head circumference adjusting device of 23. safety caps according to claim 5, is characterized in that, wherein the stop on this first track is to connect alcove the first slotted eye;

Stop on the second track is to connect the 4th slotted eye; And

The first slotted eye and the height of the 4th slotted eye on a vertical axis are slightly larger than the height of belt body tooth section, are less than the height of belt body finger.

The head circumference adjusting device of 24. safety caps according to claim 1, is characterized in that, wherein this adjusting device is fitted in a cap body inside.

The head circumference adjusting device of 25. safety caps according to claim 24, is characterized in that, wherein this cap body is provided with a combination bore, coordinates adjustment knob activity combined hat body and an adjusting device.