EP0646333B1 - Device for mounting a protective face guard and/or protective earcups on a protective helmet - Google Patents

Description

The invention relates to a protective helmet fastening system provided on both sides for adjustable Bracket from a face shield and / or ear muffs according to the preamble of independent claim 1.

There are many areas of work where a safety helmet to wear with additional hearing and / or face protection is so common in construction or forestry when operating chainsaws. The personal Protection needs of the active persons themselves as well as regulations require protective helmets to match those mentioned Protective devices can be worn combined can be available. It does not come here only on mere fulfillment of purpose, but also on carrying and Ease of use. So that the hard hat and Hearing and face protection not attached separately, had to be worn and handled soon Constructions on the market, with which the additional Protective devices were attached to the helmet.

A bracket is known which is on both sides of the Protective helmet by means of a screw connection, which the wall of which passes through, is fixed to the helmet (DE-A-22 60 311; DE-U-73 35 724). A disadvantage of this Construction is next to the increased manufacturing effort an often inadmissible weakening of the helmet shell as a result of the two through holes, and one to be carried Privacy screens would have to be created separately.

Also known is a holding frame, the edge a protective helmet surrounds and on which face and Hearing protection is installed (DE-U-75 23 571). In this version, the piercing of the Helmet shell avoided, but the construction is very complex and the handling of the head protection elements - Helmet, face and hearing protection - in combination is awkward.

Clamping parts were also developed on the edge of the helmet are to be fixed, with the clamping parts carrying bracket record for the ear muffs (DE-U-74 15 619; DE-C-27 05 348). These clamping parts are relatively simple in their constructive structure, but they are only suitable to hold a bracket. The simultaneous coupling face and hearing protection not possible.

EP-A-0 532 483 discloses a holder on a helmet, also only for a face shield that can be swiveled up or down is suitable, but not also for Ear cups. The face shield is made by two Support brackets held. One end of each bracket is on the face shield attached while at the other end of the bracket Bearing journal is provided. This journal is in one triangular eyelet and can hold three different, locked Take positions.

US-A-4 124 902 describes a holder on a protective helmet for a face shield as well as ear muffs. There are two brackets on the safety helmet, whereby In each holder there is a bracket for the face shield and a bracket for the respective ear protection shell fixed are. The bracket consists of several complicated molded parts with a fine toothing and a clamping screw, whereby there is a high manufacturing cost. For insertion the face shield and / or the ear muffs you have to partially disassemble the brackets. More constructive Construction and assembly make the brackets in use susceptible to failure, which is the case under harsher operating conditions such as occur in forest work, particularly negative affects.

The known fastening devices Working helmets for fixing face and hearing protection elements cannot all be rated as optimal will. The invention therefore pursues the objective of to create a fastening system to which both the brackets for a privacy screen, as the brackets for ear muffs at the same time can be coupled. The handling of the head protection elements must be simple and safe. Also in The entire protection system should be used in the electrical sector be. Furthermore, the fastening device by a certain robustness and sufficient against pollution be protected. In addition, the constructive structure must Allow inexpensive manufacture. For special applications, where this is sufficient, the fastening system with reduced design effort only the inclusion of a face shield or ear muffs allow.

This object is achieved by the invention System solved as in independent claim 1 is defined. Preferred embodiments result itself from the dependent claims.

First, the main use case is assumed, namely that the mounting system for the bracket both of the face shield and of Ear cups is designed. The new fastening system offers compared to the previous state the technology has considerable advantages. The use of a with safety helmet equipped with this fastening system turns out to be advantageous. The relatively small, compact and reduced weight construction as well as the function of the system leads to an optimal contact pressure of the Ear muffs when folded to the ears, for improved foldability - at a distance to the ears - and swiveling in the direction of the Back of the head. Swiveling is also improved of the face shield between the two end positions "lowered - shielding the face" and "raised - releasing the face ". The constructive structure of the Fastening system enables a balanced mass distribution of the protective devices so that their stable positioning in the respective swivel position is guaranteed and for the helmet wearer none, noticeable changes in stress arise. The system has no metal parts, so that one equipped with it Protective helmet also used for electrical work can be. The brackets for the ear muffs and the face shield no longer differentiate between left and right parts will. As a rule, the protective helmet is used with both attached ear muffs as well as the face shield used, for example when working in the forest Chainsaws. For work areas where this combination is not required, can be done with one hand protective device that is not required can be pivoted away. The fastening system is capsule-like The best structure against pollution and against manipulating Interventions protected. There is no relative in any way loosely attached parts, for example a tension spring, that could get lost. Finally, too to mention as a major advantage that the new Fastening system compared to known designs can be produced much cheaper.

Fig. 1 :

Perspektivansichten mit Schutzvorrichtungen am Schutzhelm;

1a:

Schutzhelm mit angesetzten Gehörschutzmuscheln und angesetztem Gesichtsschutzschild in den jeweiligen Endlagen;

1b:

Gehörschutzmuschel in an- und abgeklappter Position;

1c:

Gehörschutzmuschel in nach hinten geschwenkter Position;

Fig. 2 :

Darstellungen der Tragbügelplatte, Ansicht von der X-Seite mit Tragbügel für das Gesichtsschutzschild,

2a:

Tragbügel in arretierter Position "Gesichtsschutzschild abgesenkt";

2b:

Tragbügel in arretierter Position "Gesichtsschutzschild angehoben";

2c:

Schnitt gemäss Figur 2a auf der Linie B-B;

Fig. 3 :

Darstellungen des Befestigungssystems, Ansicht von der Y-Seite mit Haltebügel für die Gehörschutzmuschel und Tragbügel für das Gesichtsschutzschild,

3a:

Perspektivansicht des Arretiermechanismus für den Haltebügel;

3b:

Schnittdarstellung des Haltebügels in angeklappter Position;

3c:

Schnittdarstellung des Haltebügels in abgeklappter Position;

3d:

Explosivdarstellung, teilweise geschnitten.

An embodiment of the fastening system according to the invention is described in detail below with reference to the accompanying drawings. Show:

Fig. 1:

Perspective views with protective devices on the hard hat;

1a:

Safety helmet with attached ear muffs and attached face shield in the respective end positions;

1b:

Hearing protection in the folded and folded position;

1c:

Ear cup in the swung-back position;

Fig. 2:

Representations of the bracket plate, view from the X side with bracket for the face shield,

2a:

Support bracket in locked position "face shield lowered";

2 B:

Support bracket in locked position "face shield raised";

2c:

Section according to Figure 2a on the line BB;

Fig. 3:

Representations of the fastening system, view from the Y side with a bracket for the ear protection shell and a bracket for the face shield,

3a:

Perspective view of the locking mechanism for the bracket;

3b:

Sectional view of the bracket in the folded position;

3c:

Sectional view of the bracket in the folded position;

3d:

Exploded view, partially cut.

The protective helmet 1 has according to Figures 1a to 1c on its lower edge, in the one that extends outwards Helmet rim 11 one on each side vertically extending insertion groove passing through the helmet rim 11 12, which of upstanding webs 13 is surrounded. The insertion grooves 12 are arranged vertically above the ears of a potential helmet wearer. A fastening device is in each of the two insertion grooves 12 100 used and with one from the fastening device 100 vertically bottom extending tab 121, the tab 121 penetrates the insertion groove 12 from above and is conducted in this. The leadership is strengthened the insertion tab 121 in the insertion groove 12 through the the insertion groove 12 surrounding webs 13, so that a Type guide sleeve 14 is formed. On every fastening device 100 is a support bracket 110 - the left one or the right one - the face shield 2 and each a bracket 150 for the respective left or right Hearing protector 3 fixed. According to the current one The face shield 2 lowered (Figure 1a: full line representation) or raised (dashed line). The ear muffs 3 can have three different positions take, folded to the wearer's ears (figures 1a and 1b: full line representation), from the ears of the Carrier folded down (Figure 1b: dashed line) and finally pivoted backwards (Figure 1a: dashed lines Presentation; Figure 1c: full line representation). Locks to be described below within of the fastening device 100 cause one stable positioning of the face shield 2 and the ear muffs 3, so that an unwanted adjustment - e.g. due to jerky movements - on is prevented in any case. With a certain amount of force however, the bracket 110 is with it attached face shield 2 or the bracket 150 adjustable with the ear muffs 3 attached to it.

Figures 2a and 2b show the bracket plate 120 of the fastening device 100 in view X, that is, the surface facing the protective helmet 1. The Sectional view according to Figure 2c is the entire Illustrate the structure of the bracket plate 120. In FIG. 2a, arm 111 of support bracket 110 is lowered, while arm 111 is raised in Figure 2b. The one-piece mounting bracket plate 120 is approximately oval Shape and extends downward as a slip-in flap 121 with the parallel side flanks 124. The insertion tab 121 is dimensioned such that the plug connection between the insertion tab 121 and the guide sleeve 14 a secure fixation of the fastening device 100 guaranteed on safety helmet 1, but also an occasional pulling out of the insert tab 121 from the guide sleeve 14 with a certain amount of force is possible. In the top area and to the Adjacent edge of the bracket plate 120 is segment-like, about a curve of 90 °, a support edge 122 put on, with the outer flank 125 of the bracket plate 120 closes, with the support edge 122 from the apex line 132 of the bracket plate 120 extends approximately the same distance in both directions. This support edge 122 has two functions. So will through the uppermost area of the bracket plate 120 thickening support edge 122 that of the vertically inserted Fastening device 100 leading away The surface curvature of the protective helmet 1 is compensated. The Support edge 122 causes a play-free application of the Fastening device 100 on the protective helmet. One of the Cross-sectional areas of the support edge 122, namely those which is the transition between arm 111 and the claw 112 facing the bracket 110 serves as a stop 123 when lifting the bracket 110.

Rises from the center of the bracket plate 120 a clutch cam 126 - here with the cross-sectional shape a hexagon - around which the claw 112 of the bracket 110 takes hold. The clutch cam 126 has at least that Height corresponding to the material thickness of the claw 112, where the material thickness of the entire bracket is 110 according to the strength requirement and the space available certainly. Lid-shaped on the clutch cam 126 sits a retaining washer 127; the clutch cam 126 and the holding disc 127 can expediently form a seamless part. The holding disc The task of 127 is to prevent the Claw 112 and thus the entire bracket 110 from the Coupling cam 126 and perpendicular to the bracket plate 120 slides down. The clutch cam 126 and the Inner contour 113 - here a hexagon socket - the claw 112 have an approximately complementary geometry. The claw 112 is designed like a wrench, where the mouth opening 114 in the local variant extends downwards. The claw 112 furthermore has a groove-shaped elasticity recess 115. This passes through the material thickness of the claw 112 and extends approximately from the transition between claw 112 and the arm 111 partially in the arcuate shape the claw 112 into it. The elasticity recess 115 has the function that when plugging in and taking off of the bracket 110, more precisely the claw 112 on the Coupling cam 126, as well as when adjusting the attached Support bracket 110, the mouth opening 114 rather expanded and the operations are thereby facilitated. The clutch cams 126 and the inner contour 113 are dimensioned to each other so that a tighter Seat results. Corners and flanks of the inner contour 113 of the Claw 112 press against the corresponding corners and Flanks of the clutch cam 126. With an adjustment of the bracket 110 from the lowered to the raised Position or vice versa there is a partial twist the claw 112 around the fixed clutch cam 126. When turning, the clutch cam 126 the mouth opening 114 and the claw 112 as such spread a little bit until there is continuous rotation between the inner contour 113 and the clutch cam 126 results in a next snap position. The The claw 112 is spread and contracted by the elasticity recess 115 favors significantly. In the geometric adjustment between the inner contour 113 and clutch cam 126 it is for relief the adjustment of the support bracket 110 is advantageous, remaining air gaps 116 in the clutch cam assembly 126 and this claw 112 to be provided.

For the interaction between the clutch cams 126 and the inner contour 113 come next to this one described geometry - the hexagon - the most diverse Shapes into consideration. That's how other polygons are - from the square - conceivable, also different types of teeth with teeth wedge-shaped or rounded Cutting. It is crucial that when twisting the Claw 112 - i.e. when adjusting the support bracket 110 - in both directions, the claw 112 first spreads, an adjustment al-so is possible at all, and then at the desired height of the bracket 110 returned to a sufficiently stable resting position becomes.

It can be seen from FIGS. 2c and 3d that the Support bracket plate 120 from view Y, that is the face facing away from the protective helmet 1, likewise special has constructive features. From the center of the Support bracket plate 120, the clutch cam 126 opposite and get inside the fastener Extending 100, a pin 128 also rises a locking lug 129 and a base thickening 130. At the transition to the insertion tab 121 is a bracket plate 120 shoulder-like reinforcing edge 131 trained. The seat edge 131 is supported the fastening device 100 when inserted into the Guide sleeve 14 from. Leaves the shape of the hard hat 1 To do this, the seat edge 131 could also be on the side the X view. The 128 pin, its on the tip of the locking nose 129 and its base thickening 130, from the approach of the pin 128 ago trained, cause fixation and cohesion the bracket plate 140 and the cover 160 the bracket plate 120.

The entire bracket plate 120 with the insertion tab 121 and the components described on the View pages X and Y are advantageously in one piece Plastic molding, e.g. Injection molding process.

The fastening device 100 also includes between the bracket plate described above 120 and the cover 160 arranged bracket plate 140. The bracket plate 140 is completed Condition of the fastening device 100 to the Support bracket plate 120 pushed on, the Pin 128 through the center of the bottom 141 of the bracket plate 140 located through hole 142 protrudes through and the base thickening 130 of the pin 128 sits positively in the through hole 142. In the bottom 141 of the bracket plate 140 is - from the view side X - one to the seat edge 131 the bracket plate 120 complementary recess, so that the entire floor 141 is positively attached to the bracket plate 120 is present. With regard to the outer flank 125 and the apex line 132 is between the bracket plate 120 and the bracket plate 140 congruence, the bracket plate 140 at the seat edge 131 completes.

According to FIG. 3d, from the view side Y, the bracket plate 140 has further arrangement features on. An almost rises from the edge of the bottom 141 completely circumferential side wall 143, the only for the bracket plate 140 from below Retaining bracket 150 an opening 144th has, whereby the bracket 150 guided laterally becomes. Runs on the upper edge 145 of the side wall 143 a positioning and sealing groove 146 µm. In the area of breakthrough 144 and on both sides the sidewall 143 has a wall reinforcement 147 as therein the axis of rotation 151 of the bracket 150 is embedded. On the horizontal axis of rotation 151 is the Holding bracket 150 suspended and can between them the two positions - folded or folded Position - to be swiveled. From floor 141, below the through hole 142 rises to about a spring bar 148 to the upper edge 145 of the side wall 143 with a nose profile 149 at its tip. Is conceivable also that the spring bar 148 does not stand up from the floor 141, but such a spring bar 148 as a tongue of the side wall 143 protrudes or between the circumferential side wall 143 spans.

Approach spring bar 148 and with the nose profile 149 in contact, one is sufficient when the is closed Position of the bracket 150 (see Figures 3a, 3b and 3d), bent in the direction of the attached cover 160, an end piece of the bracket 150 forming Claw 152. The claw 152 has at its foremost Flank a horizontally extending sliding surface 153, the limited by two rounded switching edges 154, 155 becomes.

Finally, on the bracket plate 140 a domed lid 160 is set, one towards the top 145 and the positioning and Sealing groove 146 suitable lid edge 161 with corresponding protruding sealing lug 162. The lid 160 also has in the lower edge region over the attachment of the claw 152 to the remaining bracket 150 arrives, a notch 163 so that the Retaining bracket 150 when swung into the folded position is not hindered by the lid 160. Downtown the cover 160 is also a through hole 164 provided with external countersink 165.

When assembled, the lid edge lies 161 on the upper edge 145 of the bracket plate 140; there engages the sealing lug 162 in the positioning and Sealing groove 146 a. The tip of the pen 128 with the locking nose 129 at the front squeeze through the through hole 164 in the cover 160, finally snaps into the countersink 165 and thus pulls the lid 160 towards itself, thereby also the Bracket plate 140 pressed against the bracket plate 120 and thus the assembly of the fastening device 100 arises. It is also feasible instead the through hole 164 in the lid 160, a Blind hole with an expansion to be provided in which hooks the locking lug 129, so that a It is very difficult to remove the cover 160 once it has been put on becomes. This construction can be useful if it is necessary to prevent the fastening device 100 is opened illegally. With less Danger of contamination is also possible instead a circumferential closed side wall 143, only Provide webs for supporting the cover 160. Conceivable it is also to dispense with the side wall 143 and to continue the lid edge 161 that on in this way between the bottom 141 and the lid 160 a cavity for the claw 152 and the spring bar 148 is formed.

Like the bracket plate 120, the bracket plate 140 and the lid 160 advantageous as one-piece plastic moldings, e.g. in the injection molding process, produced; the same applies to the support bracket 110 and the bracket 150.

There now follows a description of the function of the Fastening device 100 with respect to the on and Fold down the bracket 150 with the attached Ear protection cup 3 and the pivoting of the bracket 150 to the rear.

Hearing protection cup 3 against the wearer's ear - folded position - (Figure 3b)

This position means that the bracket 150 from the fastening device 100 approximately vertically runs downwards. Furthermore, the spring bar 148 is through a contact edge 156 on the claw 152, which by the The sliding surface 153 lies behind the switching edge 154 and against the underside of the bulbous nose profile 149 presses, slightly bent upwards from its rest position. When viewed vertically, the contact flank lies 156 through the bevels on the claw 152 around one shade lower than the one in this position Switching edge 154 forming ridge line. During adjustment the bottom of the nose profile 149 has this position the switching edge 154 skipped. It was a maximum Deflection of the spring bar 148 and thus also Peak spring force exceeded, so that the Retaining bracket 150 remains in this position. After the Newtonian reaction principle "actio et reactio" presses the underside of the nose profile 149 in turn on the contact flank 156 of the claw 152 and thereby that the axis of rotation 151 of the bracket 150 on the x coordinate, to the left is the contact edge 156, transmits the pressure force of the spring bar 148 into one left-hand deflection force on the bracket 150, and thus the ear muff 3 to the ear of the wearer. To prevent the bracket 150 otherwise - e.g. when the protective helmet 1 is removed is swinging - unstable to the left, the means below the minimum anatomical span of the Pair of ears of a wearer, the bracket 150 strikes with a stop surface 157 when this position is reached to the edge of the bottom 141. The pressure force the ear protection cup 3 is on the ear of the wearer within the possible anatomical ranges of Ears pairs about constant and will be according to standard requirements dimensioned.

Earpiece 3 removed from the wearer's ear - folded position - (Figure 3c)

This position means that the bracket 150 protrudes obliquely from the fastening device 100. The stirrup became the folded position in a swivel motion with a certain effort moved outwards. The spring bar lifts up 148 a little bit and the spring force increases itself, because the switching edge 154 is higher than that Contact edge 156. With further adjustment, this moves Nose profile 149 on the sliding surface 153. As this on the y coordinate viewed below the switching edge 154 lies, the spring bar 148 jumps in the direction of it Rest position. If the sliding surface 153 is traversed further, the spring bar 148 is deflected upwards again because the lever arm by adjusting the claw 152 from the axis of rotation 151 to the underside of the nose profile 149 extended, causing the spring bar to be successively is pushed further up. The maximal Deflection and spring force reach the nose profile 149, if the switching edge 155 the bottom of the nose profile 149 happens. Then the nose profile 149 jumps from the previously passed sliding surface 153 and the switching edge 155 just passed behind this, the spring bar 148 also drops suddenly. The switching edge 155 is considered on the x coordinate left of the nose profile 149 and the bracket 150 remains in this position. Only when swiveling of the bracket 150 to the left and overcoming the Friction between the claw 152 and the nose profile 149 as well as when overcoming the peak deflection value and spring force of the spring bar 148 is a resumption the folded position possible.

Earpiece 3 removed from the wearer's ear - swiveled backward position - (Figure 1c)

From the folded position, it is possible to earmuff 3 located on the bracket 150 to swing back near the ear. this applies again of course equally for both on Hard hat 1 attached fasteners 100. Through the tightly fitting lid 160 on the Pin 128 becomes the bracket plate 140 to the bracket plate 120 pressed. Those of the latter two adjacent surfaces have a certain roughness on so that there is a frictional connection. Under Force is the bracket plate 120 and Retainer plate 150 rotatable against each other - the Pin 128 becomes the axis of rotation. This is an accurate one Positioning the ear protection cup 3 on the ear, but also swiveling backwards possible. The frictional relationships are dimensioned so that the Twisting can be done with reasonable effort, at the same time, however, no automatic twisting, e.g. by violent movement of the worker.

Put on and take off the head protection elements

The putting on and taking off of the face shield 2 and the ear muffs 3 happens by inserting or pulling out the two fastening devices 100 in or out of the protective helmet 1 with those on the fasteners 100 already fixed pairs of carrying brackets 110 and holding brackets 150, on which the face shield 2 or Ear cups 3 are attached. It therefore exists no need, too easy to put on and removing the face shield 2 and the Ear muffs 3, which on the brackets 110, respectively hang on the bracket 150, directly on the or to be provided by the fastening devices 100.

It can be sufficient for special applications be, either the bracket 110 for holding the face shield 2 or only the bracket 150 with the attached ear protector 3 in a fastening device to fix. Judging by the reduced Function of such a fastening device is these are simplified as follows.

Only the face shield 2

Is only the holder of the face shield 2, that is in each case one carrying bracket 110 in a fastening device can provide such a fastening device structurally greatly simplified will. One can even rely on using one restrict simplified bracket plate 120 '. The one before described structure of the bracket plate from the view X remains unchanged, however, the pen 128, including the base thickening 130, on the View Y side not needed. For the local one It is therefore sufficient to use one as simple as this Support bracket plate 120 'with its insert tab 121 provided in the protective helmet 1 on both sides To insert guide sleeves 14 and each the bracket 110 to engage with the claw 112 on the clutch cam 126. In this case, it is also conceivable to use the clutch cam 126 with the holding disc 127 instead of on the view X side on the side of the Attach view Y and then snap the claw 112 there.

Bracket only for the ear cup 3

Is only the holder of a hearing protection cup 3, that is, one holding bracket 150 each in a fastening device can also be provided here constructive simplification. Since no carrying handle 110 for attaching the face shield 2 to the Support bracket plate 120 '' could be fixed on the View X side of clutch cams 126 and the Holding disc 127 completely eliminated.

Claims (13)

1. Fastening system for fastening to a protective helmet (1), having a fastening device, which can respectively be fitted on both sides of the protective helmet (1), for adjustably holding a right and a left carrying strap (110) and/or a right and a left holding strap (150), according to which

   in alternative 1 -

   the right and left carrying strap (110), to which a respective side of a face-protection shield (2) is fastened; or

   in alternative 2 -

   the right and left holding strap (150), to which a respective hearing-protection cap (3) is fastened; or

   in alternative 3 -

   the carrying straps (110) and the holding straps (150)

   are held on the two fastening devices, characterized in that the fastening device is expandable on a modular basis and the said fastening device comprises

   in alternative 1:

   a one-piece carrying strap plate (120'), which exhibits on the side turned towards the protective helmet (1) or on the turned away side an uprising coupling cam (126) having a holding disc (127) which is moulded onto its tip in a lid shape, the coupling cam (126) being enclasped by a claw (112) which terminates the carrying strap (110) on one side and the inner contour (113) of which possesses a notching which is complementary to the outer contour of the coupling cam (126), whereby at least two stably locked adjustment positions of the face-protection shield (2) - lowered and raised - can be set;

   in alternative 2:

   a one-piece carrying strap plate (120''), which possesses on the side turned away from the protective helmet (1) a pin (128) pointing into the interior of the fastening device (100), which pin penetrates into a closely adjacent, one-piece holding strap plate (140) to which the holding strap (150) is pivotably fastened, that end which juts into the holding strap plate (140) being formed by a crook (152) which, counter to a spring bar (148) having a boss profile (149), allows two stably locked adjustment positions of the hearing-protection cap (3) - clamped and unclamped - and a spring position situated from the "clamped" adjustment position in the direction of the "unclamped" adjustment position and which, during usage, adjusts itself to the different head size, with an approximately constant contact pressure of the hearing-protection cap (3) against the ear, and a cover (160) in which the pin (128) latches is mounted on the holding strap plate (140) there, and the frictional grip between the carrying strap plate (120) and the holding strap plate (140) about the pin (128) as a rotational axis enables a twisting, brought about with a certain force expenditure, and position-holding of the holding strap plate (140) with the holding strap (150) leading therefrom in the chosen swivel position;

   in alternative 3:

   a one-piece carrying strap plate (120), which is constructed on the side turned towards the protective helmet (1) according to alternative 1 and on the side turned away from the protective helmet (1) according to alternative 2, the residual structure of the fastening device (100) corresponding to the remaining combination of the alternatives 1 and 2.
2. Fastening system according to Claim 1, characterized in that the protective helmet (1) exhibits on its bottom edge, in the outwardly extending helmet rim (11) on both sides, perpendicularly over the ears of a potential wearer, a respective insertion groove (12) passing through the helmet rim (11), which insertion groove is surrounded by upwardly erect bars (13) and thus forms a guide sleeve (14) for the, in horizontal cross-section, complementary insertion tab (121), which is moulded as a lower continuation on the carrying strap plate (120,120',120'') and is intended for insertion into the guide sleeve (14), the carrying strap plate (120,120',120'') exhibiting at the upper termination of the insertion tab (121), at least on one side, a horizontally running seating edge (131) which is seated on the guide sleeve (14), and furthermore, on the carrying strap plate (120,120',120''), in the uppermost region and adjacent to its rim, there being mounted in segment-like fashion, approximately over a radian measure of 90°, a supporting edge (122), which extends from the vertical line (132) approximately equally far on both sides and terminates with the outer flank (125), one of the cross-sectional faces of the supporting edge (122) forming a stop (123), moreover, whenever the carrying strap (110) is raised.
3. Fastening system according to Claim 1 or 2, characterized in that the claw (112) of the carrying strap (110) is shaped like an open-jawed spanner, exhibits a jaw opening (114) and possesses a groove-shaped elastic recess (115) to facilitate the expansion of the claw (112), and in that, in order to facilitate the claw (112) being placed on or removed from the coupling cam (126) and for the claw (112) to be twisted about the coupling cam (126), air gaps (116) are provided between the inner contour (113) of the claw (112) and the outer contour of the coupling cam (126).
4. Fastening system according to one of Claims 1 to 3, characterized in that the outer contour of the coupling cam (126) is a rectangle or has a yet larger number of angles or is configured as a wedge-shaped or rounded toothing, the inner contour (113) of the claw (112) being shaped complementary thereto.
5. Fastening system according to one of Claims 1 to 4, characterized in that the pin (128) rises from the centre of that side of the carrying strap plate (120) facing the holding strap plate (140) and the said pin exhibits, from its base, a base thickening (130) and, at its tip, a locking boss (129), the cross-section of the base thickening (130) being shaped such that it fits and is aligned with the pass-through bore (142) in the base (141) of the holding strap plate (140) attached to the carrying strap plate (120), and furthermore, the locking boss (129) reaches in or through a pass-through bore (164) disposed centrally in the cover (160) and hence the carrying strap plate (120), the holding strap plate (140) and the cover (160) are drawn together.
6. Fastening system according to one of Claims 1 to 5, characterized in that the side of the base (141) of the holding strap plate (140) turned towards the protective helmet (1), apart from the pass-through bore (142), is flat in principle, in that with the complementary face on the carrying strap plate (120) a frictional grip-connection is obtained, on the side turned away from the protective helmet (1) there is rising from the rim of the base (141) a side wall (143) which almost fully encircles the holding strap plate (140) and possesses at the bottom, in the region of the arrival of the holding strap (150) onto the holding strap plate (140), an aperture (144), whereby the holding strap (150) is at the same time laterally guided, or in place of the side wall (143), spacer bars supporting the cover (160) are provided, or the cover rim (161) is curved and extended such that between the base (141) and the cover (160) a large enough cavity is formed for the arrangement and movement of the crook (152) and of the spring bar (148).
7. Fastening system according to Claim 6, characterized in that on the top edge (145) of the encircling side wall (143) or at the top on the spacer bars or on the rim of the base (141) there is incorporated a positioning and sealing groove (146), for which purpose there is provided on the cover rim (161) an encircling, complementary sealing boss (162), and in that in the region of the aperture (144) the side wall (143) exhibits a wall thickening (147) so as to embed the rotational axis (151) of the holding strap (150) therein and to obtain sufficient stability whenever the hearing-protection cap (3) is swivelled towards the rear.
8. Fastening system according to one of Claims 1 to 7, characterized in that the holding strap (150) is configured, at its end reaching onto the holding strap plate (140), as a crook (152), and close to or in constant contact with the crook (152) there is provided a spring bar (148) having a boss profile (149), the claw (152) exhibiting two trip edges (154,155) which, measured from the rotational axis (151) to the boss profile (149), yield the two maximum extremities on the outer contour of the crook (152), and between the trip edges (154,155) there is situated a slide face, which, when the adjustment positions are changed, is to be brushed over by the boss profile (149), and prior, in each case, to one of the two locked adjustment positions - clamped or unclamped hearing-protection cap (3) - being reached, one of the trip edges (154,155) is sprung over upon maximum deflection of the spring bar (148) and hence against the maximum spring force.
9. Fastening system according to Claim 8, characterized in that the spring bar (148) rises up from the base (141) of the holding strap plate (140) or projects as a tongue from the side wall (143) or is clamped on between the encircling side wall (143), and the claw (152) is cranked approximately about the rotational axis (151).
10. Fastening system according to Claim 8 or 9, characterized in that in the locked adjustment position "clamped hearing-protection cap (3)", the spring bar (148) is under a residual stress, which is transmitted via the boss profile (149) on a contact flank (156) to the holding strap (150) and, as compression force of the hearing-protection cap (3), acts against the ear of the wearer, the mobility of the holding strap (150) in the inward direction being limited, finally, by a stop face (157) on the holding strap (150), which stop face is mounted on the rim of the base (141).
11. Fastening system according to one of Claims 8 to 10, characterized in that in the locked adjustment position "unclamped hearing-protection cap (3)", the spring bar (148) is likewise under stress and the boss profile (149) enclasps the associated trip edge (155) with pressure force.
12. Fastening system according to one of Claims 1 to 11, characterized in that the cover (160), in the lower marginal region lying approximately above the base of the crook (152), exhibits for the tilt motion of the holding strap (150), and as a stop for this, a jog (163).
13. Fastening system according to one of Claims 1 to 12, characterized in that the carrying strap plate (120), the holding strap plate (140), the cover (160), as well as the carrying strap (110) and the holding strap (150), are produced as one-piece plastics mouldings - e.g. by injection-moulding methods.

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