EP3903617B1 - Protective helmet with telescopically adjustable head width - Google Patents

Description

The invention relates to a protective helmet that includes a curved helmet shell, a carrying ring, a rotatable operating element and a transmission unit. The carrying ring surrounds the head of a wearer of the protective helmet and determines the head width which the protective helmet provides. The length of the support ring and thus the head width provided can be changed using the actuating element. The transmission unit transmits a rotation of the actuating element to the support ring in such a way that the head width provided is changed.

Such a protective helmet (helmet 10) is out U.S. 5,321,416 known. A carrying ring (headband 66 with front segment 70 and rear segment 68) surrounds the wearer's head. A transmission unit with a tube 94 and a rotatable shaft 99 transmits rotation of the actuating element (knob 90) to the support ring 66. Two socket head cap screws 96, 97 on the shaft 99 engage in two slots 91, 92 in the tube 94.

• DE 10 2010 052 725 B3 ,
• DE 198 82 440 B4 ,
• DE 40 22 422 A1 ,
• DE 1870098 U ,
• US 5 373 588 ,
• US 7 174 575 B1 ,
• US 2008 / 0295229 A1 und
• US 2010 / 0050325 A1

bekannt.Mechanisms to change the head width of a protective helmet are also out

• DE 10 2010 052 725 B3 ,
• DE 198 82 440 B4 ,
• DE 40 22 422 A1 ,
• DE 1870098 U ,
• U.S. 5,373,588 ,
• U.S. 7,174,575 B1 ,
• US 2008/0295229 A1 and
• U.S. 2010/0050325 A1

known.

The object of the invention is to provide a safety helmet with a mechanism for changing the head width provided by the safety helmet, the head width being able to be changed over a larger range than with known safety helmets.

The object is solved by a protective helmet with the features of claim 1. Advantageous configurations are specified in the dependent claims.

• eine gewölbte Helmschale,
• einen Tragering,
• ein Betätigungselement und
• eine Übertragungseinheit.

The protective helmet according to the invention includes

• a curved helmet shell,
• a carrying ring,
• an actuator and
• a transmission unit.

The curved helmet shell encloses a room. The terms "inside" and "outside" used below refer to this room. The support ring is attached to the inside of the helmet shell and completely or at least partially surrounds the head of a wearer of the protective helmet. The adjusted length of the carrying ring determines which head width the protective helmet provides.

The actuating element is rotatably attached to the helmet shell and is accessible from the outside.

The transmission unit transmits rotation of the actuating element to the support ring. The protective helmet according to the invention is designed in such a way that the rotation of the actuating element increases or decreases the length of the carrying ring and thus the head width provided by the carrying ring.

A clearance occurs between the actuator, which is attached to the outside of the helmet shell, and the support ring, which is attached to the inside of the helmet shell. As a rule, a rotation of the actuating element and thus a change in the head width length therefore changes the distance between the actuating element that is attached to the helmet shell and the support ring.

• ein helmschalenseitiges Übertragungsstück und
• ein trageringseitiges Übertragungsstück.

The transmission unit includes

• a transmission piece on the helmet shell side and
• a carrying ring-side transfer piece.

The transmission piece on the helmet shell side is non-rotatably connected to the actuating element. The transmission piece on the carrying ring side is non-rotatably connected to the transmission piece on the helmet shell side. It is also mechanically connected to the support ring. The transmission piece on the support ring side can also be connected indirectly to the support ring, for example with the aid of at least one gear wheel and a corresponding toothed element.

These two transfer pieces extend along a common longitudinal axis. Together the two transmission pieces bridge at least part of the distance between the actuating element and the support ring. Both transmission pieces preferably each have the shape of a rod.

The transmission piece on the helmet shell is linearly movable relative to the actuating element in two opposite directions, these two opposite directions both being parallel to the common longitudinal axis of the two transmission pieces. The transmission piece on the carrying ring side is linearly movable relative to the transmission piece on the helmet shell side in the two opposite directions parallel to this common longitudinal axis.

• durch eine lineare Bewegung des helmschalenseitigen Übertragungsstücks relativ zum Betätigungselement in eine Richtung parallel zur gemeinsamen Längsachse,
• durch eine lineare Bewegung des trageringseitigen Übertragungsstücks relativ zum helmschalenseitigen Übertragungsstück in eine Richtung parallel zur gemeinsamen Längsachse.

The distance between the actuator and the support ring can be changed in at least the following ways:

• by a linear movement of the transmission piece on the helmet shell relative to the actuating element in a direction parallel to the common longitudinal axis,
• by a linear movement of the transmission piece on the carrying ring side relative to the transmission piece on the helmet shell side in a direction parallel to the common longitudinal axis.

According to the invention, the protective helmet comprises a carrying ring, the carrying ring completely or at least partially covering the head of a wearer of the protective helmet surrounds. The support ring is preferably made of a flexible material. Because the length of the carrying ring can be changed, the protective helmet can be adapted to the head width and head shape of a wearer of the protective helmet without the need for a tool. Because the actuator is accessible from the outside, the actuator can be operated while the protective helmet is on a wearer's head. Therefore, in order to adjust the head size provided, it is not necessary to remove the protective helmet.

If the provided head width is changed with the aid of the actuating element, the distance between the carrying ring and the helmet shell often changes as well. If the transmission unit were a single rigid component, for example a rigid rod, the head size could only be changed within a very small range. Or the transmission unit would have to be connected in an articulated manner to the actuating element and/or in an articulated manner to the support ring. This would lead to a mechanically more complex and error-prone construction. In addition, the wearer's hair could be caught. The transmission unit according to the invention, on the other hand, is telescopic and therefore avoids the disadvantages of a rigid transmission unit.

According to the invention, the transmission unit comprises a transmission piece on the helmet shell side and a transmission piece on the carrying ring side. The transmission piece on the carrying ring side can be moved linearly (translationally) relative to the transmission piece on the helmet shell side, namely in two opposite directions which are parallel to the common longitudinal axis of the two transmission pieces. Preferably, the length of the two-part transmission unit can be continuously changed within a relatively large range. As a result, the distance between the support ring and the actuating element can also be continuously changed within a relatively large range.

The transmission piece on the helmet shell side is also linearly movable relative to the actuating element in these two opposite directions. A total of two relative movements are possible, namely on the one hand between the carrying ring-side transmission piece and the helmet-shell-side transmission piece and on the other hand between the helmet-shell-side transmission piece and the actuating element. Due in particular to these two possible relative movements, the head width provided by the protective helmet can be continuously changed within a relatively large range. As a result, several protective helmets according to the invention of the same type can be used for wearers with relatively widely differing head widths and/or head shapes. In many cases it is not necessary to provide different variants of the protective helmet for different head widths. In addition, a wearer can optionally use the same protective helmet with and without additional headgear on the head and under the protective helmet.

Redundancy is provided because, according to the invention, a total of three components of the protective helmet can be displaced linearly relative to one another and two different relative movements are therefore possible. The distance between the actuating element and the support ring can also be changed over a relatively large range if, for example, one of the two relative movements is no longer possible due to a technical defect. The other relative movement can then often still be carried out. The remaining relative movement that is still possible allows the distance between the actuating element and the support ring to be changed despite the defect.

The protective helmet preferably comprises an intermediate piece. The intermediate piece is non-rotatably connected to the actuating element and non-rotatably to the transmission piece on the helmet shell. As a result, on the one hand, a rotation of the actuating element is transmitted to the intermediate piece. On the other hand, a rotation of the intermediate piece is transmitted to the transmission piece on the helmet shell. Preferably, the two transmission pieces and the intermediate piece together completely bridge the distance between the actuating element and the support ring. Thanks to the intermediate piece, a larger distance between the actuating element and the support ring can be bridged.

In one embodiment, the actuating element is firmly connected to the intermediate piece and is therefore not movable relative to the intermediate piece, in particular not linearly displaceable. In a preferred embodiment, however, the actuating element is linearly displaceable relative to the intermediate piece. As a result, the distance between the actuating element and the support ring can be changed over an even larger range. A total of four components of the protective helmet are linearly displaceable relative to one another, namely the actuating element, the intermediate piece and the two transmission pieces. Thanks to the design with the movable intermediate piece between the actuating element and the transmission unit, the distance between the actuating element and the support ring can vary over an even greater range.

The intermediate piece is non-rotatably connected to the transmission piece on the helmet shell. The transmission piece on the helmet shell side is movable in the two opposite directions relative to the actuating element, specifically in that the transmission piece on the helmet shell side is movable in the two opposite directions relative to the intermediate piece.

The actuating element preferably surrounds the intermediate piece on all sides. A user can therefore turn the operating element to adjust the head width and does not have to operate the link directly. In one embodiment, the intermediate piece is passed completely through the hollow actuating element.

At least one pair of two corresponding stop elements preferably limits a linear movement of the transmission piece on the helmet shell relative to the intermediate piece. One stop element belongs to the transmission piece on the helmet shell side, the other stop element to the intermediate piece. Particularly preferably, these two stop elements limit a movement of the transmission piece on the helmet shell side away from the actuating element.

The intermediate piece is preferably hollow, and the transmission piece on the helmet shell engages in the intermediate piece. It particularly preferably depends on the rotational position of the actuating element relative to the helmet shell, how deeply the transmission piece on the helmet shell engages in the intermediate piece.

In an alternative, the helmet shell-side transmission piece is hollow and the intermediate piece engages the helmet shell-side transmission piece. Also according to this alternative, it preferably depends on the rotational position of the actuating element relative to the helmet shell, how deeply the intermediate piece engages in the transmission piece on the helmet shell side.

According to the configuration just described, the intermediate piece is connected in a rotationally fixed manner to the transmission piece on the helmet shell. In a preferred development, this non-rotatable connection is realized as follows: the transmission piece on the helmet shell has an external profile. The intermediate piece has an internal profile. Alternatively, the transmission piece on the helmet shell has an inner profile and the intermediate piece has an outer profile. In both forms of implementation, the outer profile corresponds to the inner profile. At least one projection of the outer profile engages in a corresponding recess in the inner profile, or a projection of the inner profile engages in a corresponding recess in the outer profile. The projection can be an elongated bead, the recess a channel. The ridge and the groove extend along the common longitudinal axis.

The configuration with two corresponding profiles realizes the non-rotatable connection in a particularly reliable manner and enables the transmission piece on the helmet shell side to be linearly movable relative to the intermediate piece. The torque is distributed over the entire overlapping area between the transmission piece on the helmet shell side and the intermediate piece along the common longitudinal axis. The length of this overlapping area usually depends on the rotational position of the actuating element relative to the helmet shell.

According to the invention, the actuating element is rotatably connected to the helmet shell. In one embodiment, this rotatable connection is implemented using the intermediate piece. The intermediate piece is rotatably connected to the helmet shell and attached to the helmet shell. The actuating element is firmly and in particular non-rotatably connected to the intermediate piece. There is preferably a distance between the actuating element and the helmet shell, which is bridged by the intermediate piece. In many cases, this design allows Design actuator so that it can be easily gripped and turned, even if a wearer of the helmet wears gloves. In particular, the actuating element can protrude far beyond the curved helmet shell.

In a preferred embodiment, the intermediate piece is guided through the entire actuating element. In many cases, this configuration is mechanically particularly stable.

In one embodiment, the protective helmet includes a disc that is visible from the outside. This disc surrounds the intermediate piece. The actuator surrounds the disc. The disc reduces the risk of liquid or particles penetrating the inside of the helmet shell. The pane can identify, for example, the protective helmet or a wearer of the protective helmet, for example with a specific color.

According to the invention, the transmission piece on the carrying ring side can be moved linearly in the two opposite directions relative to the transmission piece on the helmet shell side. In a preferred embodiment, a pair of two corresponding stop elements limits this relative movement in one direction. One stop element belongs to the transmission piece on the helmet shell side, the other stop element to the transmission piece on the carrying ring side. The two corresponding stop elements particularly preferably limit a movement of the transmission piece on the carrying ring side away from the actuating element. This refinement further reduces the risk of a transmission piece being damaged when the actuating element is rotated.

In a preferred embodiment, the transmission piece on the helmet shell side is hollow. The transmission piece on the carrying ring engages in the transmission piece on the helmet shell. The transmission unit thus tapers at least once from the actuating element to the support ring. This configuration takes the fact into account particularly well that there is often less space near the support ring than near the actuating element. It particularly preferably depends on the rotational position of the actuating element relative to the helmet shell, how deep the transmission piece on the carrying ring side penetrates into the helmet shell-side transfer piece engages. It is also possible that the transmission piece on the carrying ring side is hollow and the transmission piece on the helmet shell engages in the transmission piece on the carrying ring side.

According to the invention, the transmission piece on the carrying ring side is connected in a torque-proof manner to the transmission piece on the helmet shell side. In a preferred embodiment, in which the transmission piece on the helmet shell side is hollow, an outer profile of the transmission piece on the carrying ring side corresponds to an inner profile of the transmission piece on the helmet shell side. In an alternative embodiment, in which the transmission piece on the carrying ring side is hollow, an outer profile of the transmission piece on the helmet shell side corresponds to an inner profile of the transmission piece on the carrying ring side. Again, at least one projection of the outer profile engages in a corresponding recess of the inner profile, or vice versa. This configuration with two corresponding profiles also achieves the advantages that were described above with reference to the transmission piece on the helmet shell and the intermediate piece.

According to the invention, the actuating element can be rotated relative to the helmet shell. The actuating element and the two transmission pieces can preferably be rotated relative to the helmet shell about the common longitudinal axis of the two transmission pieces. However, it is also possible for a lateral offset to occur between the axis of rotation of the actuating element and the common axis of rotation of the two transmission pieces.

According to the invention, the transmission piece on the carrying ring side is mechanically connected to the carrying ring. In a preferred embodiment, the transmission unit additionally includes at least one transmission element that is rotatably mounted. The or a rotatable transmission element is preferably designed as a gear which engages in a toothed element on the support ring. In a preferred embodiment, the transmission piece on the carrying ring side is connected in a rotationally fixed manner to the or a rotatably mounted transmission element. A rotation of the actuating element is therefore by means of the transmission unit on the rotatably mounted Transferred transmission element, and this rotation causes the head size provided by the support ring is changed.

According to the invention, the transmission unit transmits a rotation of the actuating element to the support ring. This transmitted rotation causes the head width provided by the support ring to be changed. In one embodiment, the support ring comprises two support ring parts that can be moved relative to one another. The transmission piece on the carrying ring side is mechanically connected to at least one carrying ring part, preferably to both carrying ring parts, for example via the rotatable transmission element described above, which is particularly preferably in the form of a gear wheel. Movement of one support ring portion relative to the other support ring portion changes the head width provided by the support ring.

In one embodiment, at least the support ring, the actuating element and the two-part transmission unit of a protective helmet according to the invention are produced by at least one 3D printer, preferably the optional intermediate piece as well. Optionally, different components of the safety helmet are produced by different 3D printers, also at different locations. In one embodiment, the helmet shell is also produced by a 3D printer and in another embodiment by a different manufacturing process. The components are preferably combined to form a protective helmet according to the invention.

An arrangement with several 3D printers is possible, each producing at least one component of the protective helmet according to the invention. On the other hand, the invention relates to a computer program that can be run on a computer. If the computer program is executed on the computer, the computer controls at least one 3D printer. The controlled 3D printer produces the components of the protective helmet according to the invention just listed. Optionally, the computer controls several 3D printers for different components. It is also possible that different Computer programs each control a computer, and each controlled computer generates at least one component of the protective helmet according to the invention.

Figur 1

in perspektivischer Darstellung einen Schutzhelm schräg von unten;

Figur 2

den Schutzhelm von Figur 1 schräg von oben in einer Seitenansicht;

Figur 3

den Schutzhelm von Figur 1 waagerecht von vorn;

Figur 4

die Betätigungseinheit und die Übertragungseinheit in einer Querschnittsdarstellung;

Figur 5

die Betätigungseinheit und die hinteren Trageringe von hinten;

Figur 6

die Betätigungseinheit und die hinteren Trageringe von vorn;

Figur 7

die Betätigungseinheit und die Zahnräder der Übertragungseinheit, welche eine Drehung der Betätigungseinheit auf beide hinteren Trageringe überträgt, von der Seite;

Figur 8

in einer Querschnittsdarstellung eine Ausgestaltung der teleskopischen Betätigungseinheit;

Figur 9

in einer perspektivischen Darstellung die Betätigungseinheit schräg von innen;

Figur 10

in einer perspektivischen Darstellung die Betätigungseinheit in einer Seitenansicht;

Figur 11

in einer perspektivischen Darstellung die Betätigungseinheit von hinten, wobei die geriffelte Scheibe fortgelassen ist;

Figur 12

in einer perspektivischen Darstellung das Handrad aus einer Betrachtungsrichtung schräg von hinten;

Figur 13

in einer perspektivischen Darstellung die Handrad-Röhre aus einer Betrachtungsrichtung schräg von vorne;

Figur 14

in einer perspektivischen Darstellung die Handrad-Röhre aus einer Betrachtungsrichtung schräg von hinten;

Figur 15

in einer Querschnittsdarstellung die Betätigungseinheit von der Seite.

The invention is described below using an exemplary embodiment. show here

figure 1

a perspective view of a protective helmet from below;

figure 2

the hard hat from figure 1 obliquely from above in a side view;

figure 3

the hard hat from figure 1 horizontally from the front;

figure 4

the actuation unit and the transmission unit in a cross-sectional representation;

figure 5

the operating unit and the rear support rings from behind;

figure 6

the operating unit and the rear support rings from the front;

figure 7

the operation unit and the gears of the transmission unit, which transmits rotation of the operation unit to both rear support rings, from the side;

figure 8

in a cross-sectional view, an embodiment of the telescopic actuation unit;

figure 9

in a perspective view, the actuating unit obliquely from the inside;

figure 10

in a perspective representation, the actuating unit in a side view;

figure 11

in a perspective representation of the operating unit from behind, wherein the knurled disc is omitted;

figure 12

in a perspective view, the hand wheel from a viewing direction obliquely from behind;

figure 13

in a perspective view, the hand wheel tube from a viewing direction obliquely from the front;

figure 14

in a perspective view, the hand wheel tube from a viewing direction obliquely from behind;

figure 15

in a cross-sectional view, the actuation unit from the side.

The invention relates to a protective helmet that can be used by firefighters, police officers, rescue workers and other emergency services to better protect the head from mechanical, thermal and chemical influences.

Like many other protective helmets, the protective helmet of the exemplary embodiment comprises a helmet shell made of a hard material, a support structure and an interior fitting. The helmet shell is curved and encloses an area where the interior is located. The interior fittings fit the head of a person wearing this protective helmet and include textile components. This person is called "the bearer" in the following.

As used hereinafter, the terms "left", "right", "front", "back", "top" and "bottom" refer to the usual orientations when the protective helmet is on a wearer's head and the wearer is facing forward . Some figures show the viewing direction BR of a wearer looking straight ahead. The interior is omitted from the figures.

The support structure connects the interior fittings to the helmet shell and comprises a sequence of several parts of a support ring, with the support ring being completely wrapped around the wearer's head. The support ring is made of a flexible material and can conform to a certain degree to the shape and size of a wearer's head. On the one hand, this all-round support ring should fit the head without much play, so that the protective helmet does not slip during use. Therefore usually occurs between the Carrying ring and the helmet shell a distance. On the other hand, the carrying ring should not press against the head. Therefore, the carrying ring must be able to be adjusted to the head size of the wearer. The flexibility of the material alone is not enough for this adjustment. In the following, we also speak of the "head width" of the carrying ring, which is the actual length of the carrying ring on the wearer's head.

The protective helmet of the exemplary embodiment therefore includes--just like many known protective helmets--an actuating unit with a hand wheel with which the head width can be changed manually. Turning the handwheel changes the overall length of the support ring. This rotation must be transferred to the support ring inside the helmet shell. How this is done in the exemplary embodiment is described below. The handwheel acts as the actuator of the claims.

A problem solved by the invention is that the hand wheel must remain in mechanical contact with the support ring so that a user can adjust the head width by turning the hand wheel. On the other hand, the distance between the handwheel and the support ring should be able to vary within a wide range, in order to be able to change the head width over a wide range.

• eine gewölbte Helmschale 7, die bevorzugt aus einem harten Material hergestellt ist, sich also nicht an die Kopfform eines Trägers anpassen kann,
• eine Dämpfungsschale 6, die innen an der Helmschale 7 anliegt und aus einem plastisch verformbaren Material hergestellt ist, sodass die Dämpfungsschale 6 kinetische Energie aufzunehmen kann,
• ein vorderes Haltering-Teil 2, das innen an der Dämpfungsschale 6 anliegt und mit der Helmschale 7 verbunden ist,
• ein hinteres Haltering-Teil 29, das ebenfalls innen an der Dämpfungsschale 6 anliegt und mit der Helmschale 7 verbunden ist,
• ein verschwenkbares Visier 4, das drehbar mit der Helmschale 7 verbunden ist, wobei sich das Visier 4 dann, wenn es heruntergeschwenkt ist, vor den Augen des Trägers befindet,
• ein hufeisenförmiges vorderes Tragering-Teil 5, welches an der Stirn eines Trägers anliegt,
• ein linkes hinteres Tragering-Teil 9.1 und ein rechtes hinteres Tragering-Teil 9.r, die einen Abstand zu dem Kopf des Trägers aufweisen,
• ein Zwischenstück 28, welches das vordere Tragering-Teil 5 mit dem vorderen Haltering-Teil 2 verbindet,
• ein zentrales hinteres Tragering-Teil in Form einer Hinterkopfstütze 8, wobei die Hinterkopfstütze 8 am Hinterkopf des Trägers anliegt und mit der Helmschale 7 fest verbunden ist,
• ein Führungselement 3, das mit der Hinterkopfstütze 8 verbunden ist und das weiter unten beschrieben wird,
• eine Übertragungseinheit 10, 11, 12, 15, die ebenfalls weiter unten beschrieben wird, und
• eine Betätigungseinheit 1 zum Verstellen der Kopfweite des Schutzhelms 100, wobei die Betätigungseinheit 1 ein von außen zugängliches Handrad 14 umfasst, welches drehbar hinten an der Helmschale 7 befestigt ist und nach außen über die Helmschale 7 übersteht.

Figure 1 to Figure 3 show a protective helmet 100 in three perspective views

• a curved helmet shell 7, which is preferably made of a hard material, i.e. cannot adapt to the shape of a wearer’s head,
• a damping shell 6, which rests on the inside of the helmet shell 7 and is made of a plastically deformable material, so that the damping shell 6 can absorb kinetic energy,
• a front retaining ring part 2, which rests on the inside of the damping shell 6 and is connected to the helmet shell 7,
• a rear retaining ring part 29, which also rests on the inside of the damping shell 6 and is connected to the helmet shell 7,
• a pivotable visor 4 pivotally connected to the helmet shell 7, the visor 4 being in front of the wearer's eyes when pivoted down,
• a horseshoe-shaped front support ring part 5 which rests on the forehead of a wearer,
• a left rear carrying ring part 9.1 and a right rear carrying ring part 9.r, which are at a distance from the wearer's head,
• an intermediate piece 28 which connects the front support ring part 5 to the front retaining ring part 2,
• a central rear carrying ring part in the form of a rear headrest 8, the rear headrest 8 resting against the back of the wearer's head and being firmly connected to the helmet shell 7,
• a guide element 3, which is connected to the rear headrest 8 and which is described below,
• a transmission unit 10, 11, 12, 15, also described below, and
• an actuation unit 1 for adjusting the head width of the protective helmet 100, the actuation unit 1 comprising a hand wheel 14 accessible from the outside, which is rotatably attached to the rear of the helmet shell 7 and protrudes outwards beyond the helmet shell 7.

The front support ring part 5 is connected to the two rear support ring parts 9.l and 9.r by a snap-in connection 31.1, 31.r. The central rear support ring part (back of the headrest) 8 is located between the two rear support ring parts 9.l and 9.r and is connected to them. The front support ring part 5, the rear support ring parts 9.l, 9.r and the rear headrest 8 together form the support ring of the embodiment, which completely surrounds the wearer's head and partially rests against the head. This carrying ring 5, 8, 9.1, 9.r defines the head width of the protective helmet 100. The index .l designates a left-hand component, the index .r a right-hand component.

The front carrying ring part 5 is preferably surrounded by a textile covering. This textile covering is located between the front carrying ring part 5 and the forehead of a wearer of the protective helmet 100. The textile covering cushions the front carrying ring part 5 and absorbs perspiration.

Particularly preferably, the textile covering can be removed from the front carrying ring part 5 and cleaned separately from the rest of the protective helmet 100. Or the carrying ring part 5 can be removed and cleaned together with the textile covering. The back of the headrest 8 preferably also has a textile covering or at least one upholstery.

The front retaining ring part 2 and the rear retaining ring part 29 together form an encircling retaining ring which is firmly connected to the helmet shell 7 . If the head width provided by the support ring 5, 8, 9.l, 9.r is changed, the length of the retaining ring 2, 29 preferably remains constant. If the head size changes, the distance between the support ring 5, 8, 9.1, 9.r and the retaining ring 2, 29 changes.

In order to increase the head width, the left rear carrying ring part 9.l can be moved horizontally and linearly to the left relative to the central rear carrying ring part 8, and the right rear carrying ring part 9.r can be moved relative to the central rear carrying ring Move part 8 horizontally and linearly to the right. The two locking connections 31.1, 31.r between the front support ring part 5 and the two rear support ring parts 9.l and 9.r move with this shift. In order to reduce the head width, the two rear carrying ring parts 9.1, 9.r can be moved to the right or to the left accordingly. The guide element 3 guides the two movable rear support ring parts 9.1, 9.r during these linear displacements.

The hand wheel 14 of the operating unit 1 comprises a round handle element 45 with a plurality of projections 44. With the aid of the projections 44, a wearer can grip the hand wheel 14 better, even when he is wearing gloves. The handwheel 14 is mechanically connected to the two rear support ring parts 9.l, 9.r, which is described further below. It is possible that a closure unit (not shown), e.g. a cap, can be placed on the hand wheel 14 and removed again.

figure 4 shows on the right part of the helmet shell 7, the operating unit 1 and the transmission unit 10, 11, 12, 15 in a cross-sectional view. The cross-sectional area is arranged vertically and is in the middle of the protective helmet 100. The common axis of rotation DA of the operating unit 1 and of the transmission unit 10, 11, 12, 15 lies in the plane of the drawing figure 4 right and is perpendicular to the representation in figure 4 Left.

figure 5 and figure 6 show the actuating unit 1, the rear retaining ring part 29 and the rear support ring parts 9.l and 9.r. In figure 5 shows the viewing direction BR away from the viewer, in figure 6 obliquely towards the viewer. In figure 6 the front support ring part 5 and the rear headrest 8 are omitted.

figure 6 and figure 7 illustrate how a rotation of the actuating unit 1 leads to a synchronous displacement of the two rear support ring parts 9.l and 9.r towards or away from one another. A driving gear 10 is connected to the actuating unit 1 in a rotationally fixed manner. The distance between the gear wheel 10 and the operating unit 1 can be changed. A rotation of the operating unit 1 causes a rotation of the driving gear 10 to the left or to the right. The driving gear 10 meshes with a larger driven gear 12. The larger driven gear 12 is rigidly connected to a smaller driven gear 11, cf. figure 4 Left. The smaller driven gear 11 is in meshing engagement with both a toothed section 13.1 of the left rear support ring part 9.l and a toothed section 13.r of the right rear support ring part 9.r. The gears 10, 11 and 12 together provide a gear transmission. The guide unit 3 prevents a toothed section 13.1, 13.r from deviating.

• eine teleskopische Stange 15, welche eine Röhre 15.1 und einen Stift 15.2 umfasst,
• eine Scheibe 33 am vorderen Ende des Stifts 15.2, wobei die Scheibe 33 ein Durchgangsloch für den Stift 15.2 aufweist und fest mit dem antreibenden Zahnrad 10 verbunden ist, und
• eine Schraube 16, die mittig in ein entsprechendes Schraubloch 25 in dem Stift 15.2 eingeschraubt ist, fest mit der Scheibe 33 verbunden ist und das Zahnrad 10 und die Scheibe 33 an der Röhre 15.1 hält.

figure 7 shows a perspective view from the side of the translating gear 10, 11, 12 and the actuating unit 1. The common axis of rotation DA lies in the plane of the drawing figure 7 . The mechanism with which the head width of the support ring 5, 8, 9.l, 9.r can be changed also includes in the exemplary embodiment

• a telescopic rod 15 comprising a tube 15.1 and a pin 15.2,
• a washer 33 at the front end of the pin 15.2, the washer 33 having a through hole for the pin 15.2 and being integral with the driving gear 10, and
• a screw 16, screwed centrally into a corresponding screw hole 25 in the pin 15.2, is integral with the disc 33 and holds the gear 10 and disc 33 to the tube 15.1.

In the exemplary embodiment, the actuating unit 1 with the hand wheel 14 and the telescopic rod 15 can be rotated relative to the helmet shell 7 about the common axis of rotation DA. In the exemplary embodiment, the tube 15.1 functions as the transmission piece on the helmet shell side, and the pin 15.2 as the transmission piece on the carrying ring side. Both transfer pieces 15.1 and 15.2 extend along the common axis of rotation DA.

The transmission unit 10, 11, 12, 15 is supported on the rear retaining ring part 29, see also figure 4 . The screw 16 with the washer 33 engages in the pin 15.2 on the inside. The pin 15.2 is partially pushed into the tube 15.1. The tube 15.1 engages with the handwheel 14 or protrudes beyond the handwheel 14. In figure 7 the transmission piece 15 is shown twice, namely once together with the operating unit 1 and the gears 10, 11, 12 (left) and once separately (right). The axis of rotation DA is the same in both representations.

• das Handrad 14 umfassend das Griffelement 45 mit den Vorsprüngen 44,
• ein Zwischenstück in Form einer Handrad-Röhre 18, die innen in das Handrad 14 eingreift und in einer Realisierungsform sogar durch das Handrad 14 hindurchgeführt ist,
• eine geriffelte Scheibe 19,
• eine nach außen gewölbte Scheibe 34, welche die Handrad-Röhre 18 verschließt,
• eine Kennzeichnungs-Scheibe 26,
• einen Dichtungsring 47 und
• einen Sicherungsring 48.

The operating unit 1 includes in the embodiment

• the hand wheel 14 comprising the grip element 45 with the projections 44,
• an intermediate piece in the form of a handwheel tube 18, which engages inside the handwheel 14 and, in one embodiment, even passes through the handwheel 14,
• a fluted disc 19,
• an outwardly curved disk 34 which closes the handwheel tube 18,
• an identification disc 26,
• a sealing ring 47 and
• a locking ring 48.

• Anschlagelemente 22.1, 22.2, ... innen an der Handrad-Röhre 18,
• Anschlagelemente 17.1, 17.2, ... außen an der Röhre 15.1,
• Anschlagelemente 24.1, 24.2, ... innen an der Röhre 15.1,
• Anschlagelemente 23.1, 23.2, ... außen an dem Stift 15.2.

figure 8 shows a cross-sectional view through the actuating unit 1 and the telescopic rod 15. Shown are the following stop elements, which the maximum length of the telescopic unit 18, 15.1, 15.2 and thus the determine the maximum possible distance between the rear support ring parts 9.1, 9.r and the handwheel 14:

• Stop elements 22.1, 22.2, ... on the inside of the hand wheel tube 18,
• Stop elements 17.1, 17.2, ... on the outside of the tube 15.1,
• Stop elements 24.1, 24.2, ... inside the tube 15.1,
• Stop elements 23.1, 23.2, ... on the outside of the pin 15.2.

The minimum distance is limited by the length of the hand wheel tube 18, the length of the tube 15.1 and the length of the pin 15.2, whichever length is greatest.

• gestrichelt ein Profil der Helmschale 7, an welches die Handrad-Röhre 18 anliegt,
• die geriffelte Scheibe 19,
• ein O-Ring 21,
• das Schraubloch 25 und
• die Kennzeichnungs-Scheibe 26.

In addition, in figure 8 the following components are shown:

• dashed a profile of the helmet shell 7, on which the handwheel tube 18 rests,
• the rippled disk 19,
• an o-ring 21,
• the screw hole 25 and
• the identification disk 26.

Thanks to the design of the protective helmet 100 according to the invention, the range of possible head sizes that the carrying ring 5, 8, 9.1, 9.r can provide for a wearer of the protective helmet 100 is larger than with other possible transmission units between an actuating element and a carrying ring. It is possible, but not necessary thanks to the invention, to replace part of the protective helmet 100 in order to adapt the protective helmet 100 to a head width. As a result, the invention reduces the number of required variants of protective helmet 100 components that must be kept on hand. Furthermore, the invention reduces the number of replacement parts for the protective helmet 100.

Between the rear support ring parts 8, 9.l, 9.r and the helmet shell 7 there is inevitably a distance. A wearer's hair can get into the gap formed as a result. Thanks to the invention, the risk is lower than with other possible configurations of a transmission unit, that this hair is grabbed and pinched when the head width is adjusted.

The invention obviates the need to adjust the head size using a resilient element. Such a resilient element can pinch hair. The resilient element can also wear out faster than other parts.

figure 9 , figure 10 , figure 11 and figure 15 show the actuating unit 1 in different perspective representations from four different viewing directions, namely obliquely from the front ( figure 9 , the hand wheel 14 is behind the hand wheel tube 18), from the side ( figure 10 ) and straight from behind ( figure 11 , the handwheel 14 is in front of the handwheel tube 18). figure 15 shows the actuating unit 1 from the side in a cross-sectional representation. figure 12 shows a perspective view of the hand wheel 14 from a viewing direction obliquely from behind. figure 13 shows a perspective view of the handwheel tube 18 from a viewing direction obliquely from the front, figure 14 obliquely from behind.

The handwheel 14, the handwheel tube 18, the tube 15.1 and the pin 15.2 are arranged coaxially, ie have the same central axis, which central axis coincides with the axis of rotation DA, and are rotatable relative to the helmet shell 7 about this common central axis DA. The tube 15.1 can move relative to the pin 15.2 in two opposite directions parallel to this common central axis DA. In figure 7 the hand wheel tube 18 is omitted.

The hand wheel 14 is rotatably attached to the helmet shell 7 indirectly by means of the hand wheel tube 18 which is rotatably attached to the helmet shell 7, cf. figure 1 and figure 2 . The handwheel tube 18 is non-rotatably connected to the tube 15.1 by means of an inner profile of the handwheel tube 18 and a corresponding outer profile of the tube 15.1, cf. figure 7 , figure 8 and figure 9 .

The handwheel tube 18 includes a plurality of circumferential projections that extend parallel to the longitudinal axis and a plurality of circumferential projections that surround the longitudinal axis. The handwheel tube 18 is rotatable on the Helmet shell 7 attached, see. figure 13 and figure 14 . A circumferential bead 20 rests against the helmet shell 7 and surrounds the handwheel tube 18, cf. figure 2 and figure 15 . In one embodiment, this bead 20 holds the handwheel tube 18 on the helmet shell 7 together with the locking ring 48 . In another embodiment, the handwheel tube 18 is held on the helmet shell 7 exclusively by the locking ring 48 .

The identification disk 26 lies in a groove of the handwheel 14 and also surrounds the handwheel tube 18, cf. figure 2 and figure 15 . The identification disc 26 can carry a color code. The handwheel 14 and the handwheel tube 18 as well as the curved disk 34 can each have a color code, so that a combination of up to four color codes is possible.

The handwheel tube 18 can rotate about its own central axis DA relative to the helmet shell 7, but cannot be linearly displaced parallel to its own central axis DA or in another direction, in particular not translationally. The viewing direction of figure 9 is inclined outwards from the helmet shell 7, ie the handwheel 14 is located behind the in figure 9 helmet shell not shown 7.

Projections on the inner profile of the hand wheel 14 engage in corresponding recesses on the outer profile of the hand wheel tube 18 . As a result, the handwheel tube 18 is non-rotatably connected to the handwheel 14, i.e. a rotation of the handwheel 14 is transmitted to the handwheel tube 18 without any slippage worth mentioning and causes the handwheel tube 18 to rotate.

A rotation of the hand wheel 14 is also transmitted to the knurled disc 19 . When the hand wheel 14 is rotated, ripples on the disk 19 are guided over projections 27 on the bead 20 and cause an audible rattling or clicking ("acoustic feedback"). The O-ring 21 is placed in a channel of the hand wheel tube 18, specifically between the hand wheel 14 and the ribbed disk 19, cf. figure 15 . The O-ring 21 compresses in a direction parallel to the common central axis DA and re-expands on its own, providing springiness and allowing the knurled disc 19 to move relative to the handwheel tube 18 and parallel to the central axis DA of the hand wheel tube 18 so that the corrugations of the disc 19 can slide over the projections 27.

The tube (transmission piece on the helmet shell side) 15.1 is guided through the hand wheel tube 18 on the inside. An outer profile of the tube 15.1 engages an inner profile of the hand wheel tube 18, in this embodiment the outer profile and inner profile are each in the shape of a Swiss cross thereby providing a cross fit. Thanks to these two profiles, which engage with one another and thus correspond to one another, the tube 15.1 is connected to the hand wheel tube 18 in a form-fitting and non-rotatable manner. Therefore, rotation of the hand wheel 14 is transmitted to the hand wheel tube 18 and from there to the tube 15.1 without significant slip and causes the tube 15.1 to rotate. In figure 7 the hand wheel tube 18 is omitted.

The tube 15.1 can be displaced linearly in both directions relative to the handwheel tube 18 and thus relative to the handwheel 14 in a direction parallel to the common central axis DA. Several stop elements 17.1, 17.2 at one end of the tube 15.1 limit a possible movement of the tube 15.1 towards the transmission gear 10, 11, 12, cf. figure 8 . In one embodiment, it is possible for the tube 15.1 to protrude beyond the handwheel 14 on the outside. In another embodiment, the handwheel 14 covers the tube 15.1.

The pin (transmission piece on the carrying ring side) 15.2 is located inside the tube 15.1. An outer profile of the pin 15.2 is in engagement with an inner profile of the tube 15.1. As a result, the pin 15.2 is positively and non-rotatably connected to the tube 15.1. A rotation of the tube 15.1 causes a rotation of the pin 15.2 without significant slippage. Projections on the outer profile of the pin 15.2 and corresponding projections on the inner profile of the tube 15.1 prevent the pin 15.2 from sliding out of the tube 15.1.

The screw 16 passes through a recess in the driving gear 10 and holds the gear 10 and washer 33 to the inner end of the pin 15.2 and to the inner end of the driving gear 10. This prevents the driving gear 10 from coming off the pin 15.2 slides.

The driving gear 10 is connected via the driven gears 11 and 12 to the two rear support ring parts 9.l and 9.r. In one embodiment, the driving gear 10 can move linearly relative to the pin 15.2 in two directions parallel to its central axis DA, in another embodiment the gear 10 is fixedly connected to the pin 15.2 by means of the screw 16. The pin 15.2 can move linearly relative to the tube 15.1 parallel to the central axis DA. The tube 15.1 can move relative to the hand wheel tube 18 parallel to the central axis DA. The hand wheel tube 18 and thus the hand wheel 14 are attached to the helmet shell 7 . The distance between the helmet shell 7 and the two rear carrying ring parts 9.l and 9.r can thus be changed by a multi-stage telescopic unit 18, 15.1, 15.2.

• ein rundes Griffelement 45, welches mehrere nach außen zeigende Vorsprünge 44 umfasst,
• zwei gegenüberliegende Vorsprünge 37 innen an dem Griffelement 45 mit den Vorsprüngen 44,
• vier nach innen zeigende Vorsprünge 36, die als Verstärkungselemente des Handrads 14 fungieren, und
• ein Anschlagelement 40 in Form eines umlaufenden Rings, vgl. auch Figur 15.

figure 11 and figure 12 show the following components of handwheel 14:

• a round handle element 45, which comprises a plurality of outwardly pointing projections 44,
• two opposite projections 37 on the inside of the handle element 45 with the projections 44,
• four inward projections 36 which act as reinforcing members of the handwheel 14, and
• a stop element 40 in the form of a circumferential ring, see also figure 15 .

• ein Röhrenelement 30, welches ein Innenprofil aufweist, das mit dem Außenprofil der Röhre 15 korrespondiert,
• zwei gegenüberliegende Vorsprünge 38 am Außenprofil des Röhrenelements 30,
• vier nach außen zeigende Vorsprünge 35, die als Verstärkungselemente der Handrad-Röhre 18 fungieren,
• ein Anschlagelement 39 in Form einer umlaufenden Scheibe außen am hinteren Ende des Röhrenelements 30, vgl. auch Figur 15, und
• die nach außen gewölbte Scheibe 34, die das Röhrenelement 30 nach außen verschließt.

figure 11 , figure 13 and figure 14 show the following components of the handwheel tube 18:

• a tube element 30 which has an inner profile which corresponds to the outer profile of the tube 15,
• two opposite projections 38 on the outer profile of the tubular element 30,
• four outwardly pointing projections 35, which act as reinforcement elements of the hand wheel tube 18,
• a stop member 39 in the form of a rotating disk externally at the rear end of the tubular member 30, cf figure 15 , and
• the outwardly curved disk 34 which closes the tubular element 30 outwardly.

The two projections 38 on the outside of the handwheel tube 18 engage in two corresponding recesses on the projections 37 of the handwheel 14, cf. Figure 11 to Figure 14 . Rotation of the hand wheel 14 is transmitted to the hand wheel tube 18 by the elements 37 and 38 . The handwheel 14 is therefore connected to the handwheel tube 18 in a torque-proof manner.

The hand wheel tube 18 is rotatably connected to the helmet shell 7 . The handwheel tube 18 can be rotated about its own axis of rotation DA relative to the helmet shell 7, but cannot perform any other movement and in particular no linear movement parallel to its own axis of rotation DA. Among other things, the retaining ring 48 contributes to this.

The hand wheel 14 is preferably not connected directly to the helmet shell 7 . Rather, the hand wheel 14 is held by the hand wheel tube 18 . The handwheel 14 can move relative to the handwheel tube 18 in either direction parallel to the common central axis DA. The two stop elements 39 and 40 limit a linear movement of the handwheel 14 away from the helmet shell 7. The stop element 40 of the handwheel 14 namely abuts against the stop element 39 of the handwheel tube 18 from the inside, cf. figure 15 . The circumferential bead 20 limits a linear movement of the hand wheel 14 towards the helmet shell 7, cf. figure 2 .

The identification ring 26 is clamped in a corresponding bead located between the disc 34 and the tubular element 30 of the handwheel tube 18, cf. figure 15 . <b><u>List of symbols</u></b> 1 Actuating unit for adjusting the head width, comprises the hand wheel 14, the hand wheel tube 18, the knurled disc 19, the discs 34 and 26 and the O-ring 21 2 centrally arranged front retaining ring part, attached to the helmet shell 7, rests on the damping shell 6 3 Guide element for the rear support ring parts 9.l, 9.r, attached to the helmet shell 7 4 pivoting visor 5 front support ring part, articulated to the rear support ring parts 9.1, 9.r 6 Damping shell, located inside the helmet shell 7, absorbs kinetic energy 7 curved helmet shell, carries the retaining ring 2 and the handwheel 14 8th central rear carrying ring part in the form of a back of the headrest, arranged between the carrying ring parts 9.l and 9.r 9.l left rear carrying ring part, articulated to the front carrying ring part 5 9th right right rear support ring, articulated to the front support ring part 5 10 driving gear, connected to the hand wheel 14 via the telescopic rod 15 11 driven smaller gear meshing with the driving gear 10 12 driven larger gear, firmly connected to the driven smaller gear 11, in engagement with the two toothed portions 13.l and 13.r 13.l toothed section of the left rear support ring 9.l, in meshing engagement with the driven larger gear 12 13.r serrated portion of right rear support ring 9.r, in meshing engagement with driven larger gear 12 14 The hand wheel of the operating unit 1 accommodates the hand wheel tube 18 on the inside, includes the grip element 45 with the projections 44 and the stop element 40 15 telescopic rod connecting the handwheel 14 to the driving gear 10 15.1 The tube of the rod 15, routed inside through the hand wheel tube 18, can protrude over the hand wheel 14, is non-rotatably and positively connected to the pin 15.2, acts as the transmission piece on the helmet shell 15.2 The pin of the rod 15, guided inside through the tube 15.1, non-rotatably and positively connected to the tube 15.1, acts as the transmission piece on the carrying ring side 16 Screw, which prevents the driving gear wheel 10 from slipping off the pin 15.2, is passed through the disc 33 17.1, 17.2, ... Stop elements on the outside at the outer end of the tube 15.1 limit a linear movement of the tube 15.1 towards the driving gear wheel 10 18 Handwheel tube, guided internally through the handwheel 14, the serrated disc 19 and through the helmet shell 7, non-rotatably and positively connected to the tube 15.1, held by the retaining ring 48 19 corrugated disc, non-rotatably connected to the handwheel 14 20 circumferential bead on the helmet shell 7, surrounds the handwheel tube 18, has projections 27 for "acoustic feedback" when the handwheel 14 is turned 21 O-ring between the knurled disc 19 and the helmet shell 7 22.1, 22.2, ... Stop elements on the inside of the handwheel tube 18 correspond to the stop elements 17.1, 17.2, ... 23.1, 23.2, ... Stop elements on the outside of the pin 15.2 correspond to the stop elements 24.1, 24.2 24.1, 24.2, ... Stop elements on the inside of the tube 15.1 correspond to the stop elements 23.1, 23.2 25 Screw hole at the inner end of the pin 15.2 26 Identification disk surrounding hand wheel tube 18 surrounded by hand wheel 14 27 Projections on the bead 20 correspond to corrugations on the corrugated disc 19 28 rigid intermediate piece between the front retaining ring 2 and the front carrying ring part 5 29 Centrally arranged rear retaining ring part, attached to the inside of the helmet shell 7 30 Tubular element of the hand wheel tube 18, provides an internal profile 31.l Locking connection between the front support ring part 5 and the left rear support ring part 9.l 31.r Snap-in connection between the front carrying ring part 5 and the right rear carrying ring part 9.r 32 another visor pivotally attached to the front retaining ring part 2 33 Washer at the front end of the pin 15.2, firmly connected to the driving gear 10 by means of the screw 16 34 domed disc which closes the hand wheel tube 18, together with the tube element 30, holds the identification ring 26. 35 Protrusions of a first type on the outside of the handwheel tube 18, acting as reinforcing members, abut the knurled disc 19 36 Protrusions of a first type, internal to the hand wheel 14, act as reinforcing members 37 Projections of a second type internal to the handwheel 14, receiving the projections 38, provide the rotational connection with the handwheel tube 18 38 Projections of a second type on the outside of the handwheel tube 18, engage projections 37, effect the non-rotatable connection with the handwheel 14 39 Stop element on the outside of the handwheel tube 18 40 circulating ring on the handwheel 14 acts as a stop element which abuts against the stop element 39 44 outward-pointing projections on the round handle element 45 45 round handle element of the handwheel 14, includes the projections 44 47 O-ring wrapped around the handwheel tube 18 48 Retaining ring placed around the handwheel tube 18 100 Protective helmet includes the helmet shell 7, the damping shell 6, the front retaining ring part 2, the rear retaining ring part 29, the carrying ring with the carrying ring parts 5, 8, 9.l, 9.r and the operating unit 1 BR Direction of view of a wearer of safety helmet 100 looking straight ahead

Claims (16)

1. Protective helmet (100), comprising:

   - a domed helmet shell (7);

   - a support ring (5, 8, 9.1, 9.r) which is fastened to the inside of the helmet shell (7);

   - an externally accessible activating element (14) which is rotatably fastened to the helmet shell (7); and

   - a transmission unit (10, 11, 12, 15, 16, 25);
   wherein the support ring (5, 8, 9.1, 9.r)

   - completely or at least partially surrounds the head of a wearer of the protective helmet (100); and

   - establishes a head width of the protective helmet (100);

   wherein the transmission unit (10, 11, 12, 15, 16, 25) transmits a rotation of the activating element (14) to the support ring (5, 8, 9.1, 9.r) in such a manner that the head width provided by the support ring (5, 8, 9.l, 9.r) is varied;

   wherein the transmission unit (10, 11, 12, 15, 16, 25) comprises

   - a helmet shell-proximal transmission piece (15.1); and

   - a support ring-proximal transmission piece (15.2);
   wherein the two transmission pieces (15.1, 15.2)

   - conjointly completely or at least partially bridge the spacing between the activating element (14) and the support ring (5, 8, 9.1, 9. r);

   - extend along a common longitudinal axis (DA) and are preferably both rod-shaped;
   wherein the helmet shell-proximal transmission piece (15.1)

   - is connected in a rotationally fixed manner to the activating element (14); and

   - is linearly movable relative to the activating element (14) in two opposite directions parallel to the common longitudinal axis (DA),
   characterized in that
   the support ring-proximal transmission piece (15.2)

   - is connected in a rotationally fixed manner to the helmet shell-proximal transmission piece (15.1) and mechanically connected to the support ring (5, 8, 9.1, 9.r); and

   - is linearly movable relative to the helmet shell-proximal transmission piece (15.1) in two opposite directions parallel to the common longitudinal axis (DA); and
   wherein
   the spacing between the activating element (14) and the support ring (8, 9.l, 9.r) is variable

   - by a linear movement of the helmet shell-proximal transmission piece (15.1) relative to the activating element (14) as well as

   - by a linear movement of the support ring-proximal transmission piece (15.2) relative to the helmet shell-proximal transmission piece.
2. Protective helmet (100) according to Claim 1,

   characterized in that

   the protective helmet (100) comprises an intermediate piece (18); wherein the intermediate piece (18) is connected in a rotationally fixed manner to the helmet shell-proximal transmission piece (15.1) and connected in a rotationally fixed manner to the activating element (14); and

   wherein the helmet shell-proximal transmission piece (15.1) is linearly movable relative to the intermediate piece (18) in two opposite directions parallel to the common longitudinal axis (DA); and wherein the activating element (14) preferably surrounds the intermediate piece (18).
3. Protective helmet (100) according to Claim 2,

   characterized in that

   the intermediate piece (18) comprises at least one intermediate piece-proximal detent element (22.1, 22.2); and

   the helmet shell-proximal transmission piece (15.1) comprises at least one outer helmet shell-proximal detent element (17.1, 17.2); wherein the, or each, intermediate piece-proximal detent element (22.1, 22.2) communicates with the, or in each case one, outer helmet shell-proximal detent element (17.1, 17.2); and

   wherein the, or each, pair of two communicating detent elements (17.1, 22.1; 17.2, 22.2) delimits a linear movement of the helmet shell-proximal transmission piece (15.1) relative to the intermediate piece (18) parallel to the common longitudinal axis (DA);

   preferably delimits a movement away from the activating element (14).
4. Protective helmet (100) according to Claim 2 or Claim 3,

   characterized in that

   the intermediate piece (18) is hollow; and

   the helmet shell-proximal transmission piece (15.1) engages in the intermediate piece;

   wherein the helmet shell-proximal transmission piece (15.1), preferably as a function of the rotary position of the activating element (14) relative to the helmet shell (7), engages to dissimilar depths in the intermediate piece (18).
5. Protective helmet (100) according to Claim 4,

   characterized in that

   the helmet shell-proximal transmission piece (15.1) has an external profile; and

   the intermediate piece (18) has an internal profile which communicates with the external profile;

   wherein the rotationally fixed connection between the intermediate piece (18) and the helmet shell-proximal transmission piece (15.1) is established by the two communicating profiles.
6. Protective helmet (100) according to one of Claims 2 to 5,

   characterized in that

   the intermediate piece (18) is rotatably connected to the helmet shell (7); and

   a spacing arises between the activating element (14) and the intermediate piece (18).
7. Protective helmet (100) according to one of Claims 2 to 6,
   characterized in that
   the activating element (14) is linearly displaceable relative to the intermediate piece (18) in two opposite directions which are parallel to the common longitudinal axis (DA).
8. Protective helmet (100) according to one of Claims 2 to 7,
   characterized in that
   the intermediate piece (18) is guided by the entire activating element (14).
9. Protective helmet (100) according to Claim 8,
   characterized in that
   the protective helmet (100) comprises an externally visible disc (26); wherein the disc (26) surrounds the intermediate piece (18) and the activating element (14) surrounds the disc (26).
10. Protective helmet (100) according to one of the preceding claims,

    characterized in that

    the helmet shell-proximal transmission piece (15.1) comprises at least one inner helmet shell-proximal detent element (24.1, 24.2); and

    the support ring-proximal transmission piece (15.2) comprises at least one support ring-proximal detent element (23.1, 23.2);

    wherein the, or each, inner helmet shell-proximal detent element (24.1, 24.2) communicates with the, or in each case one, support ring-proximal detent element (23.1, 23.2); and

    wherein the, or each, pair of two communicating detent elements (24.1, 23.1; 24.2, 23.2) delimits a linear movement of the support ring-proximal transmission piece (15.2) relative to the helmet shell-proximal transmission piece (15.1) parallel to the common longitudinal axis (DA);

    preferably delimits a movement away from the activating element (14).
11. Protective helmet (100) according to one of the preceding claims,

    characterized in that

    the helmet shell-proximal transmission piece (15.1) is hollow; and the support ring-proximal transmission piece (15.2) engages in the helmet shell-proximal transmission piece (15.1);

    wherein the support ring-proximal transmission piece (15.2), preferably as a function of the rotary position of the activating element (14) relative to the helmet shell (7), engages to dissimilar depths in the helmet shell-proximal transmission piece (15.1).
12. Protective helmet (100) according to Claim 11,

    characterized in that

    the support ring-proximal transmission piece (15.2) has an external profile; and

    the helmet shell-proximal transmission piece (15.1) has an internal profile which communicates with the external profile;

    wherein the rotationally fixed connection between the two transmission pieces (15.1, 15.2) is established by the two communicating profiles.
13. Protective helmet (100) according to one of the preceding claims,
    characterized in that
    the activating element (14) and the two transmission pieces (15.1, 15.2) are rotatable relative to the helmet shell (7) about the common longitudinal axis (DA).
14. Protective helmet (100) according to one of the preceding claims,

    characterized in that

    the transmission unit (10, 11, 12, 15, 16, 25) comprises at least one rotatably mounted transmission element (10, 16, 26), preferably having at least one gear wheel (10);

    wherein the support ring-proximal transmission piece (15.2) is fixedly connected to the, or a, rotatably mounted transmission element (10, 16, 25).
15. Protective helmet (100) according to one of the preceding claims,

    characterized in that

    the support ring (5, 8, 9.1, 9.r) comprises at least two movable support ring parts (9.1, 9.r) which are movable relative to one another; wherein the transmission unit (10, 11, 12, 15, 16, 25) transmits a rotation of the activating element (14) to the support ring (5, 8, 9.1, 9.r) in such a manner that the two support ring parts (9.1, 9.r) move relative to one another;

    wherein a movement of the two support ring parts (9.1, 9.r) relative to one another causes a variation of the established head width; and wherein the support-ring proximal transmission piece (15.2) is mechanically connected to at least one support ring part (9.1, 9.r).
16. Computer program which is able to be executed on a computer and when executed initiates the computer to actuate a 3D printer in such a manner that the actuated 3D printer generates the support ring (5, 8, 9.l, 9.r), the activating element (14) and the transmission unit (10, 11, 12, 15, 16, 25) of a protective helmet (100) according to one of Claims 1 to 15.

Images