Interdental brush holder

Abstract

The present invention relates to an interdental brush holder having two arms (201, 202) which are connected to one another via a rotary joint (401). The arms can be rotated about an annular body. The arms can be locked in different positions by using latching recesses (1101, 1102, 1103, 1104) and a latching lug (901, 902). The latching lug (901, 902) can be displaced along the guide surface (8) on a guide line (10). The guide surface (8) has a transport region (1201; 1202) between two adjacent latching recesses (1101, 1102; 1102, 1103). The transport region has, adjacent to the latching recesses (1101, 1102), in each case one unstable resistance region which drives the latching lug (901) away from the latching recess (1101, 1103) and towards the centre of the transport region (1201, 1202).

Description

[0001] Title:

[0002] Interdental brush holder

[0003] Description of Technical Area

[0004] The invention relates to an interdental brush holder with a swivel joint and a locking mechanism, enabling easy handling and a secure hold. In particular, the invention relates to the field of daily oral hygiene.

[0005] The invention further relates to a combination of an interdental brush holder and a cover cap.

[0006] State of the art

[0007] From CH 714 292 A1, an interdental brush holder with a swivel joint and a cover cap is known. Description of the invention.

[0008] The object of the invention according to claim 1 is to improve an interdental brush holder according to the preamble of claim 1 in such a way that a simpler and more reliable locking function for the arms of the interdental brush holder is achieved. An object of the invention according to claim 14 is to improve an interdental brush holder according to the preamble of claim 14 in such a way that a more stable mounting of the interdental brush holder in the cover cap is achieved.

[0009] The solution to the first problem is defined by the features of claim 1. According to the invention, the interdental brush holder has two arms connected to each other by a pivot joint. The pivot joint has two half-shells that are mechanically rotatable together about a geometric axis of rotation of the pivot joint. A first arm of the two arms is fixed to the first half-shell and a second arm of the two arms is fixed to the second half-shell. A guide surface is provided in the first half-shell and a locking lug is provided in the second half-shell such that the locking lug is slidable along a guide line on the guide surface and can engage in at least two spaced-apart locking positions formed by locking recesses in the guide surface. The guide surface has a transport area between two adjacent locking recesses.The transport area has an unstable resistance area adjacent to each of the detent recesses, which drives the detent nose away from the detent recess and towards the center of the transport area.

[0010] The holder features a design in which the arms rotate around a geometric axis. The locking mechanism is housed within the swivel joint. By using a specially designed guide surface along which a locking lug is guided, the holder can be locked in various positions with a soft click. This invention enables easy handling and precise positioning of the interdental brush.

[0011] The design of the guide surface and its interaction with the locking lug enables a defined locking of the arms in the desired positions, which increases user-friendliness and prevents accidental adjustments during use.

[0012] The invention has the advantage that the arms can be moved quickly and accurately into the desired detent position. Because the detent recesses, and thus the detent positions, are significantly spaced apart from one another by the extended transport area, setting the various positions is faster and more accurate compared to CH 714292 A1. In the known solution, the large number of immediately adjacent detent recesses means that the user has to exert a relatively large amount of force when adjusting the arms and therefore easily overshoots the desired position.

[0013] The invention has the advantage that, when the arms are rotated relative to each other, a braking effect is created by the resistance area before the locking lug engages in the desired locking position. This provides the user with haptic feedback that the arm is about to lock into place. The invention is particularly suitable for pivot joints with only a small number of locking positions. In contrast to the prior art according to CH 714292, it is not the purpose of the invention to create dozens of closely spaced locking positions.

[0014] Swivel joint with toroid-like casing:

[0015] According to a particular embodiment of the invention, the interdental brush holder is characterized in that the pivot joint essentially forms a toroid-like joint body. The arms are integrally formed on the toroid-like joint body and project outwards with respect to the geometric axis of rotation of the pivot joint (or the toroid).

[0016] Preferably, the swivel joint encloses a central passage. This has the advantage that, on the one hand, the adjacent surfaces of the swivel joint (which are important for the guiding function of the joint components) are relatively far from the center of rotation (which increases stability), and on the other hand, material consumption is low because the central area not required for the joint function is free of material.

[0017] The central area, which forms the opening of the toroid-like shell, can also be partially or completely filled with material. In this sense, the interdental brush holder, for example, can have a material plate in its center. This can increase the rigidity of the interdental brush holder.

[0018] According to a particularly preferred embodiment, the pivot joint forms a ring body. The cross-section of the ring body can have any shape, but is preferably a circle, an ellipse, a rectangle, or a quadrilateral with one or more convexly curved sides.

[0019] The toroid-like enclosing body or the ring body defines a toroidal mirror plane or a ring body mirror plane that is perpendicular to the geometric axis of rotation of the reversible joint. The arms are intersected longitudinally by this toroidal or ring body mirror plane and are rotatable relative to each other in this mirror plane about the geometric axis of rotation of the reversible joint.

[0020] Length of the transport area:

[0021] In a particular embodiment, the interdental brush holder is characterized in that the transport area, measured on the guide line, is at least twice as long, in particular at least four times as long, as the detent recess.

[0022] This length of the transport area, compared to the detent recess, allows the resistance zone to be developed over a longer distance, resulting in smoother operation. This guidance of the detent lug leads to a more stable and controlled movement between detent positions.

[0023] Within the scope of the invention, it is not necessary that all detent recesses be spaced apart from one another by a transport area of ​​the inventive type. It is also conceivable that the pivot joint also has detent recesses that are arranged directly one after the other, as known from CH 714292 A1.

[0024] V-shaped recesses:

[0025] In a special design, the interdental brush holder is characterized by the fact that the locking recesses are V-shaped.

[0026] V-shaped detent recesses provide precise and self-centering guidance for the detent nose, resulting in improved stability in the detent positions.

[0027] Alternatively, the resting recess can also be U-shaped, arc-shaped or otherwise designed.

[0028] Profile of the locking tab:

[0029] The locking lug can have an acute angle in profile. The angle of the locking lug can be greater than, equal to, or less than the angle of the V-shaped locking recess.

[0030] The locking lug can also be oval or circular in profile. The locking lug does not have to have the same or a similar angle to the locking recess. It is therefore also possible to combine a V-shaped locking lug with a semicircular profile for the locking recess.

[0031] Straight-line transport area:

[0032] According to a particular embodiment of the invention, the transport area is straight. This means that, for example, two V-shaped locking recesses are connected by a longer straight transport area that deviates significantly from a circular shape.

[0033] A straight transport path simplifies the manufacture of the interdental brush holder, as less complex shapes and tools are required, which can lead to cost savings in production.

[0034] The transport area can also be trough-shaped. This means it has a flat or straight middle section and two rising end sections, which form the resistance zones.

[0035] Shape of the guide line: The guide line is arc-shaped and forms at least one arc around the geometric axis of the pivot joint.

[0036] Training of the resistance area:

[0037] In a particular embodiment, the resistance area is formed by the fact that the transport area connects to a detent recess with a connection angle greater than 0° with respect to a detent lug reference line, in particular that the connection angle is at least 10°, particularly preferably at least 20°.

[0038] The latch reference line corresponds to the line along which the latch would always exert the same force. If the guide line is a circular arc, then the latch reference line is also a circular arc.

[0039] A resistance area with a connection angle greater than 0° ensures a defined force transmission that drives the detent lug away from the detent recess and towards a center of the transport area.

[0040] A larger connection angle (e.g., 20° or more) increases the mechanical displacement force on the locking lug towards the center of the transport area. This increases the instability of the locking lug at the edge of the transport area. It also increases the resistance that must be overcome when the locking lug is to be moved from the center of the transport area into the locking recess.

[0041] In a particular embodiment, the unstable resistance area measured along the guide line is at least half as long, preferably at least as long, as a detent.

[0042] If the resistance area is at least as long as the detent, the user can feel the resistance force over a sufficiently large area, making the operation of the swivel joint more comfortable.

[0043] The specific combination of resistance area and locking recess allows the user to lock the brush into place with an audible and tactile "soft click", which supports intuitive operation.

[0044] According to a particular embodiment of the invention, the unstable resistance zone, measured along the guide line, is at least half as long, preferably at least as long, as a detent. This has the advantage that the user feels the resistance over a longer range of motion of the joint, and thus a sudden engagement in the detent is better "announced".

[0045] Mounting of the locking lug: In a special design, the locking lug has an elastically spring-loaded mounting, so that it is pressed against the guide surface.

[0046] The elastically spring-loaded mounting of the locking lug ensures a controlled contact force against the guide surface, resulting in reliable guidance when rotating the joint.

[0047] Alternatively, it is possible to manufacture the locking lug from a material that is relatively elastic compared to the material of the guide track.

[0048] In a particular embodiment, the locking lug is formed at a free end of a rod-shaped element, which is fixed to the half-shell at the opposite end. The elastic mounting of the locking lug thus results from the rod-shaped element being elastically bendable. The rod-shaped element can be formed directly on the half-shell.

[0049] The arrangement of the locking lug at the free end of a rod-shaped element is technically simple to manufacture. The length and cross-section of the rod-shaped element define the spring force (or restoring force) that arises when the free end is deflected.

[0050] The rod-shaped element is fixed to the half-shell and, for example, molded on using injection molding. It is, for example, parallel to the geometric axis of rotation of the swivel joint (or the half-shell).

[0051] Alignment of the locking tab:

[0052] In a special design, the locking lug is directed radially towards a geometric center of the ring body and is pressed onto the guide track towards the center of the ring body by the spring bearing.

[0053] Alternatively, the locking lug can also be oriented radially outwards. This means that the guide track is located further outwards than the locking lug with respect to the geometric axis of rotation of the swivel joint.

[0054] The radial orientation of the locking lug promotes a centric force application, which is advantageous for a rotation-direction-independent interaction of the guide track and locking lug.

[0055] The spring-loaded bearing, which pushes the locking lug towards the center of the ring body, achieves an even pressure distribution that supports a secure and stable positioning of the arms.

[0056] Number of resting recesses:

[0057] In a particular embodiment, the guide surface has no more than six detent recesses. Preferably, these detent recesses define four angular positions of the swivel joint, in particular a closed angular position (at, for example, 0°), a right-angled position (at, for example, 90°), an obliquely protruding position (at, for example, 135°), and a diametrically opposed angular position (at, for example, 180°).

[0058] Limiting the number of detent positions to no more than six simplifies the design of the swivel joint and advantageously allows for extended transport areas between them.

[0059] The four defined angle positions have proven comfortable for cleaning between teeth. The specific angles at 90°, 135°, and 180° allow for ergonomic adjustment to different orientations of the interdental spaces and contribute to ease of use. The 0° position is used for transporting the interdental brush holder.

[0060] Number of resting recesses:

[0061] In a special design, no more than six, in particular a maximum of four, detent positions are provided for the locking lug in the guide surface.

[0062] Limiting the locking tab to a maximum of four positions allows for simple and intuitive operation of the interdental brush holder.

[0063] The clear definition of the locking positions makes it easier to position the brush and thus to operate the interdental brush.

[0064] Number of locking tabs:

[0065] In a particular embodiment, the swivel joint has two locking lugs. Preferably, the locking lugs are in a diametrically (essentially 180°) offset position on the swivel joint.

[0066] The arrangement of two locking lugs in an offset position improves the stability and precision of the swivel joint.

[0067] The offset positioning of the locking lugs can lead to a more even distribution of the mechanical load and thus minimize the wear of the swivel joint.

[0068] However, it is also possible to provide two locking lugs in a position offset by one-third of the circle, or to distribute three locking lugs evenly around the circumference. With two or more locking lugs, the force exerted on the guide surface per locking lug can be reduced without reducing the locking force (i.e., the force required to rotate the pivot joint out of the locked position).

[0069] Coupling of the half-shells:

[0070] In a particular embodiment, for the rotatable coupling of the two half-shells, one of the two half-shells has at least one ring segment with a hook-shaped cross-section, and the other half-shell has at least one ring segment with a rib-shaped cross-section. When the half-shells are coupled, the hook-shaped ring segment engages behind the rib-shaped ring segment.

[0071] The hook-shaped ring segment enables a stable and durable connection of the half-shells, resulting in increased product reliability.

[0072] The use of complementary ring segments facilitates the joining of the half-shells and can reduce assembly time. The half-shells are advantageously connected by a snap-fit ​​mechanism when joined in the direction of the geometric axis of rotation of the rotary bearing.

[0073] The hook- and rib-shaped ring segments provide a connection that ensures stable joint function even with frequent use.

[0074] In a particular embodiment, the hook-shaped ring segment is provided on a wall of one half-shell that is located on the outside with respect to the center (geometric axis of rotation) of the ring body. The rib-shaped ring segment is provided on a wall of the other half-shell that is located on the outside with respect to the center of the ring body.

[0075] The positioning of the hook-shaped ring segment and the rib-shaped ring segment on an outer wall of the respective half-shell increases the stability of the coupling and thus the reliability and durability of the swivel joint.

[0076] Alternatively, it is also possible to form rib segments and hook segments on the wall closest to the center of the ring body.

[0077] The coupling can be designed in the form of a tongue and groove, whereby the tongue and groove are movable relative to each other in a direction perpendicular to the profile view in order to allow the rotation of the two half-shells relative to each other.

[0078] In a special design, the hook-shaped ring segment is directed away from the center of the ring body and the rib-shaped ring segment is directed towards the center of the ring body.

[0079] Placement of the guide surface:

[0080] In a particular embodiment, the guide surface is directed away from the center of the pivot joint, especially of the toroid-like ring body, and in particular essentially radially outwards. The locking lug is directed towards the center of the ring body.

[0081] The radially outward-facing guide surface facilitates the insertion of the interdental brush into the holder by providing a clear path. Because the locking lug is directed towards the center of the ring body, it travels along a larger orbit around the center, while the guide track is more compact, resulting in greater stability and rigidity compared to a spring-loaded locking lug. Furthermore, this design ensures precise positioning and locking of the arms, leading to increased safety during use.

[0082] In a particular embodiment, the guide surface is formed on an inner wall located within the ring body, which defines the central passage. "Inner" means that this part of the ring body is not visible from the outside. The guide surface is open in a radial direction towards the outside of the ring body.

[0083] The guide surface formed on the inner wall of the ring body provides a robust structure for guiding the interdental brush and increases its durability.

[0084] The guide surface and locking lug are protected against contamination because they are hidden and thus protected within the ring body.

[0085] Dimensioning of the ring body:

[0086] In a particular embodiment, the ring body essentially has the shape of a torus (swimming ring). Such a torus has a central opening. The thickness (DT) of the torus is less than the diameter (DD) of the central opening. In particular, the thickness (DT) of the torus is less than half the diameter (DD) of the central opening.

[0087] The torus-shaped design of the ring body with a central passage whose diameter is larger than the thickness of the torus allows for a grippy construction while providing sufficient space for holding with the fingertips.

[0088] The reduced thickness of the torus compared to the diameter of the central passage can lead to material savings and thus lower manufacturing costs.

[0089] In a particular embodiment, the interdental brush holder is characterized by the fact that the ring body and the two arms are of the same thickness in a direction perpendicular to a plane that is jointly defined by the ring body and the arms.

[0090] The uniform thickness of the ring body and arms in a direction measured perpendicular to the defined plane ensures a compact design and is particularly suitable for housing the arms in a cover cap when the interdental brush holder is not in use.

[0091] The uniform thickness of the components facilitates handling of the interdental brush holder. Interdental brush holders tend to be small, so it is advantageous for the arms and ring body to have a certain volume. The consistent thickness contributes to a uniform appearance, which can enhance the aesthetic appeal of the product.

[0092] Training of the Armed Forces:

[0093] In a special design, the arms are attached to the ring body in such a way that they lie parallel to each other at a 0° position.

[0094] The parallel arrangement of the arms in the 0° position allows for compact storage of the interdental brush holder, which facilitates transport.

[0095] In a particular embodiment, the interdental brush holder is characterized in that the arms, lying parallel next to each other in the 0° position, together have a width (BA) that is less than an outer diameter (DA) of the ring body, in particular that the width (BA) is at least one fifth smaller than the outer diameter (DA).

[0096] The smaller width of the arms compared to the outer diameter of the ring body makes it possible to accommodate the arms in a cover cap whose width is no greater than the ring body.

[0097] In one particular design, the arms are circular in cross-section.

[0098] The circular cross-sectional shape of the arms provides uniform stability in all transverse directions. Furthermore, it allows for a homogeneous, aesthetically pleasing design.

[0099] Interdental brush coupling on the arms:

[0100] In a particular embodiment, the interdental brush holder is characterized in that the arms have a coupling at one end, facing away from the ring body, for attaching an interdental brush. Preferably, the coupling is designed in the form of a bayonet coupling, a plug-in coupling, or a clamp coupling.

[0101] The design of the coupling at the end of the arms allows for quick and safe changing of the interdental brushes, which simplifies handling and improves hygiene.

[0102] Because the interdental brushes are replaceable on the interdental brush holder, material consumption can be reduced. Interdental brushes are changed frequently to maintain hygiene. Therefore, the interdental brush holder can be used for a longer period without compromising hygiene. Furthermore, the same interdental brush holder can be used for different interdental brushes.

[0103] The coupling types, such as bayonet, plug-in, or clamp couplings, are easy for the user to operate. Rotation angle limitation:

[0104] The invention also relates to an interdental brush holder with the following features:

[0105] It has two arms connected to each other via a swivel joint; a) the swivel joint has two half-shells that are mechanically rotatable together about a geometric axis of rotation of the swivel joint; b) the first of the two arms is fixed to the first half-shell and the second of the two arms to the second half-shell; c) on the first half-shell there is an arc-shaped free space extending around a center of the ring body with two end stops; d) and on the other half-shell there is an engagement element that projects into the arc-shaped free space.

[0106] Such an interdental brush holder can additionally be designed according to the special designs explained above.

[0107] According to a particular design, the interdental brush holder has the following features:

[0108] - the pivot joint has the shape of a toroid-like joint body, in particular a ring body

[0109] - the arms are rotatable around a geometric axis of rotation of the pivot joint in a joint body mirror plane or ring body mirror plane defined by the toroid-like joint body, in particular the ring body.

[0110] - the toroid-like joint body, in particular ring body, has two ring-shaped half-shells that are mechanically rotatable together with respect to a geometric joint axis that is perpendicular to the said joint body mirror plane or ring body mirror plane;

[0111] - one arm of the two arms is fixed to the first half-shell and one arm of the two arms is fixed to the second half-shell;

[0112] - in the toroid-like joint body, in particular ring body, a first half-shell has an arc-shaped free space extending around a central passage of the ring body with two end stops; - in the toroid-like joint body, in particular ring body, an engagement element is formed on a second half-shell, which projects into the arc-shaped free space.

[0113] The rotatable connection of the half-shells around a geometric axis allows for precise adjustment of the angle of the arms, enabling individual adaptation to different interdental spaces and more effective cleaning.

[0114] The arc-shaped clearance with end stops and the corresponding engagement element enable a defined limitation of the rotation range of the half-shells, which prevents overextension of the arms and contributes to the product's longevity.

[0115] Furthermore, an advantage of this design is that the end stops can be housed inside the ring body.

[0116] In one particular version, the free space extends over a semicircle. This defines, on the one hand, a closed position (i.e., 0° position of the arms) and, on the other hand, a diametrically open position (i.e., 180° position of the arms).

[0117] The ability to fix the arms in an 0° position contributes to compact storage and protection of the brush heads, while the 180° position allows for convenient use of the holder when cleaning interdental spaces.

[0118] Arrangement of open space

[0119] In a particular embodiment, the interdental brush holder is characterized in that the free space is formed on an inner wall located inside the ring body, which limits the central passage, and is open in a radial direction towards the outside with respect to the ring body.

[0120] The formation of the free space on an inner wall of the ring body protects the mechanism from contamination and damage, thus improving the product's durability and hygiene.

[0121] Cover cap:

[0122] In a special design, the arms can be inserted into a slot in the cover cap in a 0° position and are consequently housed in the cover cap, such that a predominant part of the ring body lies outside the cover cap.

[0123] The ability to insert the arms into the cap at an 0° angle allows for space-saving storage of the interdental brush holder and prevents damage to the brushes or contamination during transport. Since a significant portion of the joint, particularly the ring body, lies outside the cap, the handle of the interdental brush holder remains accessible even with the cap in place, ensuring quick and easy handling.

[0124] Dimensions of the cover cap:

[0125] In a particular embodiment, the combination is characterized in that the cover cap is as wide as an outer diameter (DA) of the ring body in a transverse direction that is perpendicular to a longitudinal direction of the cover cap and which, when the interdental brush holder is inserted into the cover cap, lies in a plane formed by the ring body and the arms.

[0126] The fact that the cover cap is the same width as the outer diameter of the ring body not only ensures an aesthetically pleasing and harmonious design, but also trouble-free handling during transport, since the cover cap together with the inserted interdental brush holder is practically block-like and has no protruding parts.

[0127] The arrangement of the cover cap in a plane formed by the ring body and the arms contributes to a stable and wobble-free storage of the interdental brush holder when it is inserted into the cover cap.

[0128] Concave edge at the insertion opening:

[0129] In a particular embodiment, the combination is characterized by the fact that the cover cap has an insertion opening with a side wall having a concave edge that at least approximately follows the contour of the ring body.

[0130] The concave edge design of the side wall of the insertion opening allows for a form-fitting reception of the joint body, in particular the toroid-like joint body, especially preferably the ring body, which leads to a secure fixation of the interdental brush holder in the cover cap.

[0131] Guide elements on the cover cap:

[0132] In a particular embodiment, the combination is characterized by the fact that a first guide element is provided on an inside of the cover cap and a second guide element is provided on one arm of the interdental brush holder, wherein the two guide elements are designed in such a way that the arm receives linear guidance in the longitudinal direction of the cover cap when inserted into the cover cap.

[0133] The linear guidance of the arm within the cover cap enables easy and precise handling, thus reducing the risk of mispositioning the interdental brush holder when inserting it into the holder. The design of the guide elements contributes to the stability of the connection between the cover cap and the interdental brush holder, ensuring a secure bond between the two.

[0134] The linear guide facilitates quick and intuitive insertion of the arm into the cover cap, thus improving ease of use.

[0135] In a special embodiment, the combination is characterized by the fact that the first guide element forms a channel and the second guide element forms a projection, so that the projection can be guided through the channel.

[0136] The groove-projection configuration can be implemented as a simple and cost-effective manufacturing process, which reduces production costs.

[0137] Guiding the projection through the groove prevents the arm from tilting, which improves handling safety and user comfort.

[0138] In a special embodiment, the combination is characterized by the fact that two first guide elements are formed on the cover cap and the second guide element is formed on each arm, so that both arms are guided when inserted.

[0139] The provision of two guide elements on the cover cap ensures symmetrical and balanced guidance of both arms, which increases the stability of the interdental brush holder during use.

[0140] Because each arm has its own guide, the interdental brush holder can be fixed in the cover cap with only one arm, while the other arm extends, for example, at a 90° angle. This allows the cover cap to be used as an extended handle for the interdental brush holder, increasing user comfort during cleaning.

[0141] Locking mechanism of the interdental brush holder:

[0142] In a particular embodiment, the combination is characterized by the fact that a first locking element is present on an inside of the cover cap, which can interact with a second locking element on the ring body, so that the interdental brush holder is held in the inserted position in the locking cap.

[0143] The locking mechanisms ensure that the interdental brush holder is securely locked in the cover cap, preventing accidental release during transport.

[0144] According to a particular embodiment of the combination, the first guide element or the second guide element and the first locking means and the second locking means are arranged such that the interdental brush holder is held in place with only one arm inserted into the cover cap and the other arm is free for use.

[0145] The interaction of the locking mechanisms enables an audible or tactile click, giving the user clear feedback about the correct positioning.

[0146] Single-arm positioning in cover cap:

[0147] In a particular embodiment, the combination is characterized in that the first guide element and the second guide element and the first locking means and the second locking means are arranged such that the interdental brush holder is held in place in the cover cap with only one arm and the other arm is free for use.

[0148] The arrangement of the guide and locking mechanisms allows one arm to be held in place while the other remains free for use, enabling a comfortable grip on the interdental brush holder attached to the cover cap.

[0149] Definitions:

[0150] The term "cover cap" here refers to a cap that serves to cover the arms of the interdental brush holder and protect the interdental brushes that can be attached to the arms. The "cover cap" is preferably made of a rigid material.

[0151] The term "axis" or "axis of rotation" refers here to an imaginary line around which the arms of the interdental brush holder rotate when the swivel joint is actuated.

[0152] The term "connection angle" here refers to the angle at which two sections of the guide surface meet, connecting or coupling components or structures.

[0153] The term "arm" here refers to one of the two parts of the interdental brush holder, which are connected to each other via the swivel joint and can rotate around the ring body. An "arm" is typically a rod-shaped, i.e., elongated, part. An interdental brush (permanent or replaceable) can be attached to the free end of the "arm".

[0154] The term "outer wall" here refers to the surface or side of the ring body that faces outwards in a radial direction.

[0155] The term "rotary joint" here refers to a connection between two arms that allows them to be rotated around a common axis (namely the geometric axis of rotation of the rotary joint).

[0156] The term "intervention element" here refers to an element that projects into the arc-shaped free space and thus engages within it. The term "insertion opening" here refers to an opening or cavity that serves to insert or plug in a component or structure.

[0157] The term "spring-loaded mounting" here refers to a design in which the locking lug is elastically mounted and pressed against the guide surface.

[0158] The term "free space" here refers to an arc-shaped space that runs around the central passage of the toroid-like joint body or ring body and has two end stops.

[0159] The term "guiding element" here refers to a structural component or device that serves to control or limit the movement or orientation of another component. The two components are in physical contact in the sense of a sliding contact.

[0160] The term "guide surface" here refers to a surface along which the locking lug of the interdental brush holder can move in sliding contact. The "guide surface" has a longitudinal direction (along which displacement occurs) and a first and second transverse direction, which are perpendicular to the longitudinal direction. The first transverse direction runs parallel to the "axis" of the pivot joint, and the second transverse direction is perpendicular to the first transverse axis and thus parallel to the "axis" of the pivot joint.

[0161] The term "guide line" here refers to a line along which the locking lug of the interdental brush holder moves when the swivel joint is actuated.

[0162] The term "joint body mirror plane" refers here to a plane that divides the joint body into two symmetrical halves. The "joint body mirror plane" is perpendicular to the geometric axis of rotation of the revolute joint. The "ring body mirror plane" is defined analogously.

[0163] The term "hook-shaped ring segment" here refers to a ring-shaped segment with a curved form, which is attached to an outer wall of a hemisphere and points outwards.

[0164] The term "half-shell" here refers to one half of a solid overall structure, with two "half-shells" together forming the overall structure. The "half-shells" of an overall structure do not have to be identical or mirror-symmetrical to each other. The overall structure can, for example, enclose an internal cavity. Consequently, each of the "half-shells" can have a concave area, with the concave areas of the two half-shells forming the internal cavity of the overall structure.

[0165] The term "inner wall" refers here to the radially inward-facing inner surface or side of the toroidal joint body or ring body. The term "interdental brush" refers here to a special type of brush used for cleaning the spaces between teeth. It can consist, for example, of a plastic part (for attaching to the interdental brush holder) and a handle with bristles projecting perpendicular to the handle's longitudinal axis. The interdental brush itself has no handle and is interchangeable and attached to the interdental brush holder.

[0166] The term "interdental brush holder" here refers to a device designed to hold and guide interdental brushes. The interdental brushes are preferably attached to the interdental brush holder in a replaceable manner.

[0167] The term "combination" here refers to a set of separate elements that are coordinated in terms of function and construction.

[0168] The term "concave edge" here refers to an edge or border that is curved or bent inwards and creates additional clearance compared to a straight edge.

[0169] The term "coupling" here refers to a device used to attach an interdental brush to the arm of the interdental brush holder, such as a bayonet coupling, a plug coupling or a clamp coupling.

[0170] The term "longitudinal direction" here refers to the main axis or the direction along the length of a component or structure.

[0171] The term "center" here refers to the central point of the swivel joint of the interdental brush holder. It is the geometric point at which the "axis" or "axis of rotation" intersects the "joint body mirror plane".

[0172] The term "transverse direction" here refers to a direction that runs perpendicular to the longitudinal direction or main axis of a component or structure.

[0173] The term "radial direction" here refers to a direction that runs outwards from the center of the ring body.

[0174] The term "locking element" here refers to a device or structure used to detachably hold two parts that are movable relative to each other and in contact with each other in a specific position. A "locking element" can be a structure projecting from a surface or a recess formed in the surface. A locking element can also be a specific shape (e.g., a convex shape) of a body (such as the round cross-section of an arm) that corresponds to a surface with an opposing or complementary shape. The term "locking lug" here refers to a structural elevation or projection that serves to engage in a corresponding recess or notch and ensure a secure connection or positioning.

[0175] The term "latch reference line" refers here to an imaginary line that serves as a reference point for the position of the latching lugs. The "latch reference line" is understood as a line resulting from specific latching lug positions relative to the guide surface. These latching lug positions are determined by the fact that the latching lug is under the same (predefined) contact pressure against the guide surface. The combination of these latching lug positions along the displacement path of the latching lug yields the "latch reference line."

[0176] The term "detent recess" here refers to a recess in the guide surface that serves to receive the detent lug and position it in a single, unambiguous detent position. If the detent lug is moved laterally out of this position, it will automatically return to the unambiguous detent position under the action of the spring bearing.

[0177] The term "ring body" here refers to a component in the form of a ring, which serves as a pivot joint and to connect the two arms of the interdental brush holder.

[0178] The term "ring segment" here refers to a part of the hemisphere that does not form a closed circle, but only a circular segment.

[0179] The term "ribbed ring segment" here refers to a ring-shaped segment with rib structures that is attached to an outer wall of a hemisphere and points towards the center of the ring body.

[0180] The term "rod-shaped element" here refers to an elongated component that is attached to the half-shell at one end and is free at the other. Due to the one-sided clamping of the "rod-shaped element," the free end is resilient to such an extent that the locking lug is always in contact with the "guide surface."

[0181] The term "transport area" here refers to the area between two adjacent but spaced-apart detent recesses. To move from one detent recess to the next, the detent lug must pass through the "transport area." The "transport area" is free of pronounced detent positions in which the swivel joint can be fixed to hold the arms at the correct angle during teeth cleaning.

[0182] The term "resistance zone" here refers to the area at one end of the transport zone. Within the "resistance zone," the locking lug is driven away from the locking recess and towards the center of the transport zone. This can be caused, for example, by the force pressing the locking lug onto the guide surface not being perpendicular to the guide surface, but at an angle of less than 90°, resulting in a force parallel to the guide surface that drives the locking lug towards the center of the transport zone (according to the principle of a "sliding body on an inclined plane").

[0183] The term "central passage" here refers to the central cavity or free space that is enclosed by the ring-shaped body in the manner of a torus ("swimming ring").

[0184] The term "center" here refers to the central point of the joint body or the ring body.

[0185] The term "toroid" refers to a surface of revolution with a hole in its center. The axis of rotation passes through the hole and therefore does not intersect the surface of the revolution. For example, if a rectangle is rotated around an axis parallel to one of its edges, a hollow ring with a rectangular cross-section is formed. If the rotated figure is a circle, it is called a torus. A "toroid-like" body refers to a body that is identical or similar to a toroid, and may also have local edges, as in the case of a hexagonal or octagonal ring.

[0186] Functional relationships:

[0187] Depending on the specific embodiment of the invention, one of the following relationships applies:

[0188] The "swivel joint" is part of an "interdental brush holder".

[0189] The "rotary joint" contains an "axis", a "guide surface", a "latch reference line", a "latch", a "latch recess", a "transport area" and a "resistance area".

[0190] The "rotary joint" is also an element of the "interdental brush holder", which also has an "arm" and a "ring body".

[0191] The "ring body" has a "ring body mirror plane", an "axis", a "center", a "half-shell", a "ring segment", "second locking means", an "outer wall" and an "inner inner wall".

[0192] The "rotary joint" can have a "ring body mirror plane" and a "guide surface".

[0193] The "rotary joint" defines the position and orientation of the "axis".

[0194] The swivel joint has a detent reference line, a detent, a detent recess, a transport area, and a resistance area. The interdental brush holder interacts with the cover cap and the interdental brush. The cover cap also interacts with the ring body and has an insertion opening, a side wall, a concave edge, and a guide element.

[0195] The "ring body" also interacts with the "insertion opening", the "side wall", the "concave edge" and the "guide element".

[0196] The "guide surface" is related to the "latch reference line" and includes the "connection angle", the "latch recess", the "transport area" and the "resistance area".

[0197] The "latching nose" interacts with the "guide surface", the "latching nose reference line", the "latching recess" and the "resistance area".

[0198] The "detent recess" is adjacent to the "connection angle", interacts with the "detent nose", has a directional orientation with respect to the "center", a distance to the "detent nose reference line" and is adjacent to the "transport area" and the "resistance area".

[0199] Brief description of the drawings

[0200] The drawings used to illustrate the exemplary embodiment show:

[0201] Fig. 1 shows an interdental brush holder in a front view;

[0202] Fig. 2 shows a top view of an interdental brush holder with a cover cap;

[0203] Fig. 3 shows a side view of an interdental brush holder.

[0204] Fig. 4 shows a sectional view of the interdental brush holder according to Figure 3;

[0205] Fig. 5 shows a schematic sectional view of a locking mechanism of the

[0206] Interdental brush holder;

[0207] Fig. 6 shows a schematic representation of the function of a locking mechanism of the

[0208] Swivel joint of an interdental brush holder;

[0209] Fig. 7 shows a sectional view of the interdental brush holder with diametrically positioned

[0210] Poor;

[0211] Fig. 8 shows a combination of an interdental brush holder and a cover cap, wherein both arms are housed in the cover cap; Fig. 9 shows a combination of an interdental brush holder and a cover cap, wherein only one

[0212] The arm is fixed in the cover cap;

[0213] Fig. 10 shows an exploded perspective view of an interdental brush holder;

[0214] Fig. 1 1 an exploded perspective view of the interdental brush holder rotated by 90° compared to Figure 10;

[0215] Fig. 12 shows a sectional view of the component inserted into the cover cap.

[0216] Interdental brush holder;

[0217] Fig. 13 shows a combination of interdental brush holder and cover cap with

[0218] Guide elements;

[0219] Fig. 14 shows a sectional view transverse to the longitudinal axis of the cover cap.

[0220] Basically, identical parts in the figures are marked with the same reference symbols.

[0221] Ways to implement the invention

[0222] Figure 1 shows an interdental brush holder in a front view.

[0223] The illustrated interdental brush holder 1 consists of a central pivot joint 4 in the form of an annular body 401 with a central passage 4011. The annular body 401 has two arms 201, 202, which are attached to different, relative to each other rotatable half-shells (see Figs. 2 and 10: reference numerals 601, 602). At the free end of each arm 201, 202, there is a coupling 1901 or 1902, to which an interdental brush 301 or 302 is detachably attached. The outer diameter of the pivot joint 4 (here of the annular body 401) is designated DA, and the common width of the parallel arms 201, 202 is designated BA.

[0224] According to a particular embodiment, the common width BA of the arms 201, 202 is less than the outer diameter DA of the pivot joint. Preferably, the width BA plus twice the wall thickness of the side wall of the cover is at most as large as the outer diameter DA of the pivot joint or ring body 401.

[0225] According to a special embodiment, the length of the arms 201, 202 is at least as large as the outer diameter DA of the pivot joint.

[0226] According to a particular embodiment of the invention, the interdental brushes 202 attached to the arms 201, 202 extend in the same direction as the arms 201, 202. Figure 2 shows the interdental brush holder when it is inserted into the cover cap 50. The ring body 401 protrudes from the cover cap 50, essentially completely. Only a small edge region of the ring body is recessed in the cover cap 50.

[0227] The ring body 401 has the form of a torus. The thickness of the torus is marked DT and is preferably smaller than the diameter DD of the central passage of the ring body 401.

[0228] According to a special design, arms 201 and 202 of the

[0229] Interdental brush holder 1 in the O° position in the cover cap space and are fully supplied in the cover cap 50.

[0230] Figure 3 shows a side view of an interdental brush holder.

[0231] The illustration shows the interdental brush holder with its two arms 201, 202, which are connected via a swivel joint 401. It also shows that the arms 201, 202 are attached to two different half-shells 601, 602 of the ring body 401.

[0232] The drawing shows the pivot joint when the two arms 201 and 202 are at a right angle to each other. A coupling 1901, designed as a bayonet, plug-in, or clamp coupling for attaching an interdental brush, is visible at the distal end of one arm 201. The other coupling 1902 on the other arm 202 is identical.

[0233] Figure 3 shows the mirror plane of the ring body. It is perpendicular to the drawing plane and simultaneously bisects arms 201 and 202 longitudinally and the ring body 401 transversely to axis 7. Axis 7 represents the geometric axis of rotation of the pivot joint 4. Arms 201 and 202 rotate around this axis.

[0234] In the embodiment shown, the arms 201 and 202 are the same thickness as the torus of the ring body 401.

[0235] Figure 4 shows a sectional view of an interdental brush holder in the ring body mirror plane (section AA in Fig. 3).

[0236] This cross-sectional view shows the central pivot joint 4 of the interdental brush holder, which takes the form of a ring body 401. The rotatable arms 201 and 202 are positioned around the ring body 401 in a 90° position.

[0237] Inside the ring body 401, a locking mechanism is provided that allows the arms 201, 202 to be positioned in a desired orientation from among several possible orientations. According to a preferred embodiment, the locking mechanism includes two locking lugs 901, 902. The locking mechanism also includes a guide surface 8 with which the locking lugs interact. The guide surface 8 is located inside the ring body 401. This guide surface 8 has several locking recesses 1101-1106 into which the locking lugs 901, 902 can engage to define and fix various angular positions of the arms 201, 202. According to a particular embodiment, the locking lugs 901, 902 are arranged in the drawing essentially diametrically opposite to each other with respect to the axis 7.

[0238] The detent recesses 1101 and 1102 are offset from each other by 90° with respect to the axis 7 of the ring body 401. Detent recess 1101 defines the parallel (or 0°) position of the arms 201, 202.

[0239] The detent recesses 1102 and 1103 are offset from each other by 45° with respect to the axis 7 of the ring body 401. This means that when the detent lug is moved from detent recess to detent recess 203, the angle between the two arms and 203 increases by 45° to a total of 135°.

[0240] The detent recesses 1103 and 1104 are also offset from each other by 45° with respect to the axis of the ring body.

[0241] In contrast, the detent recesses 1101 and 1102 are offset from each other by 90° with respect to the axis of the ring body. This means that the arms 202 are shifted from the 0° position (closed or parallel position) to a 90° position when moving from one detent recess to the other.

[0242] The first detent recess 1101 is located diametrically opposite the fourth detent recess 1104 with respect to axis 7. In the closed position of the arms 201 and 202, the detent lugs 901 and 902 are therefore positioned in the detent recesses 1104 and 1101. When the pivot joint is actuated, the detent lugs 901 and 902 move into the detent recesses 1101 and 1102.

[0243] As this explanation makes clear, in a fixed position of the arms, two locking lugs are always simultaneously engaged in a locking recess. This corresponds to a preferred embodiment of the invention.

[0244] It is of course conceivable that in a fixed position of the arms, only one locking lug clicks into a locking recess.

[0245] Figure 4 also shows a particular embodiment of the invention, characterized by the fact that the transport area 1202 (measured on the guide line 10 according to Figure 5) is at least four times as long as a single detent recess 1103, 1104. It is also apparent that the detent recesses 1101-1106 are V-shaped according to a particular embodiment. Figure 5 schematically illustrates the operation of the joint mechanism. The figure essentially shows a section through the pivot joint perpendicular to the axis 7 of the pivot joint. In Figure 5, the axis 7 is perpendicular to the plane of the drawing and intersects it at the center of the ring body 401. The mirror plane of the ring body (see reference numeral 5 in Figure 3) corresponds in principle to the plane of the drawing.

[0246] According to the invention, a guide surface 8 is provided within the pivot joint, and in the present case within the ring body, which in this example extends around the center of the ring body. It is not necessary for the guide surface to form a completely closed surface. It can also extend only over an angular range of 180°, 135°, or 90°.

[0247] The guide surface 8 is shown in Figure 5 only as an example and does not correspond to the specific embodiments in Figures 4, 7, 10 and 11.

[0248] In the simplified representation of Figure 5, the guide surface 8 has several straight sections. However, it is not essential for the invention that the sections be straight or that they meet in the manner of an edge or a sharp transition.

[0249] The guide surface 8 has several (here, for example, 4) detent recesses 1101–1104 into which the detent lug 901 can engage. A detent recess is characterized by the fact that the detent lug 901 assumes a unique detent position 1111, 1112 within the extent of the detent recess 1101, 1102. If the detent lug is moved laterally out of this detent position 1111, 1112, it will automatically move back into the unique detent position 1111, 1112 under the action of the spring bearing 13. This means that considerable force is required to move the detent lug out of the detent position. This ensures that the arms remain in the corresponding detent position, especially when it is an angular position used for cleaning the teeth.

[0250] Here, such a locking lug 901 is shown, which has a spring bearing 13 and thus presses the locking lug 901 against the guide surface 8. The spring bearing 13 is shown here only schematically.

[0251] If the guide surface is formed on the first half-shell 601 of the ring body, then the spring bearing 13 is formed on the second half-shell (not shown). When the half-shells are rotated relative to each other, the spring bearing moves along a circular arc-shaped guide line 10.

[0252] Figure 5 further shows a circular arc-shaped detent lug reference line 101 (dotted circle). When the tip of the detent lug 901 is on this detent lug reference line 101, the spring bearing exerts a specific spring force fO on the detent lug 901. Assuming the spring bearing is designed such that the spring force is proportional to the displacement from a specific reference point on the detent lug reference line 101, the following results: When the detent lug 901 moves radially 14 away from the detent lug reference line 101 towards the center 12, the tension of the spring bearing 13 decreases and the spring force decreases. When the detent lug is moved out of the center of the detent recess because the pivot joint is rotated, the tension of the spring bearing increases. Thus, an increasing resistance force must be overcome.As long as the locking lug is within the area occupied by the locking recess, the locking lug will always move into the position specified by the lowest point of the locking recess if no rotational force or counterforce is exerted on the pivot joint from the outside.

[0253] When the transition to transport area 1201 is exceeded, the distance between guide track 8 and the locking lug reference line 101 increases successively. Because the locking lug 901 is located on an inclined plane (because the tangent to guide track 8 is at an angle other than 90° to the radial direction 14, i.e., the direction of force), the locking lug is forced towards the center of the transport area. The size of the angle between the local tangent to the locking lug reference line 101 and the tangent 102 to guide track 8 indicates how strongly the locking lug 901 is pressed in a direction along guide track 8 (e.g., clockwise or counterclockwise).

[0254] The guide surface 8 forms a transport area 1201 between two adjacent detent recesses 1101 and 1102, which is shown here as a straight line. The transport area 1201 has an unstable resistance area 1301, 1302 at each of its two end regions. Between the two resistance areas 1301, 1302 is a central region 1303. In this central region, the angle between the tangent to the guide track and the tangent to the detent nose reference line 101 is relatively small, in particular not greater than 20° or even not greater than 10°.

[0255] Since in the present example the transport area forms a continuously flat surface, it is not possible to see from the surface 1201 itself which part of the transport area 1201 forms an unstable resistance area 1301 , 1302.

[0256] Which part of the transport area constitutes a resistance area 1301, 1302 within the meaning of the invention is determined by the angle between the local tangent to the latch reference line and the local tangent to the guide surface. The locations where the local tangents are determined are defined by the radial ray that extends from the center through the latch tip.

[0257] If the angle between the guide track and the tangent to the latch reference line is so large that the latch moves away from the detent recess on its own, then the latch is located in the unstable resistance zone 1301, 1302 of the transport zone 1201. According to a particular embodiment of the invention, there is a local inclination angle of at least 10° in the resistance zone. The local inclination angle is determined by the difference angle between the local tangent to the guide surface and the local tangent to the latch reference line.

[0258] According to the invention, the transport area is characterized by the absence of a defined detent position. Within the transport area, the detent lug can remain in arbitrary positions due to friction against the guide surface. It can then be moved back and forth without requiring significant effort from the user.

[0259] Only in the resistance range is a certain amount of force required when the locking lug is moved towards the end of the transport range.

[0260] In the illustration of Figure 5, when the locking lug 901 is moved counterclockwise from the locking recess 1101 towards the transport area 1201, it first encounters the unstable resistance area 1301.

[0261] The diagram also shows the connection angle 801, which describes the transition between the transport area 1201 and the detent recess 1101. The connection angle 801 corresponds to the difference angle between the local tangent to the detent lug reference line 101 and the tangent 102 to the guide surface 8 at the end of the transport area 1201.

[0262] This connection angle 801, which in this case is greater than 20°, is a criterion for the described unstable resistance range.

[0263] Figure 5 also shows that, according to a preferred embodiment of the invention, the length of the transport area is greater than the length of the detent. The length is determined along the guide line 10. The length of the detent is obtained by drawing a radial line from the center through each endpoint of the detent and determining the length of the guide line between the two radial lines. Similarly, the length of the transport area is determined by drawing a radial line from the center 15 of the pivot joint through each endpoint of the transport area and determining the length of the guide line between the two radial lines. The corresponding intersection points 1001, 1002, and 1003 are marked in Figure 5.The distance between intersection points 1001 and 1002 determines the length of the transport area, and the distance between intersection points 1002 and 1003 determines the length of the detent. The length of the detent is determined almost angularly (and not along the guide surface).

[0264] Figure 6 illustrates the function of the swivel joint shown in Figure 5. The rotation angle of the swivel joint is plotted on the abscissa (x-axis), and the contour of the guide track 8 (solid line) relative to the detent reference line (dashed line 101) is shown on the ordinate (y-axis). Additionally, the force in the clockwise direction of rotation is schematically represented as a dotted line.

[0265] The reference line 101 for the locking lug is a circle (or a circular arc), as is the guide line 10. However, in Figure 6, the circle is transformed into a straight line.

[0266] The figure shows the locking lug 901, which is movable on the guide surface 8 along a guide line 10. The guide surface 8 has locking recesses 1101 and 1102 and a transport area 1201. Also shown are the unstable resistance areas 1302 at the transition between the transport area and the adjacent locking recess 1101 or 1102. The locking lug 901 can engage in the locking recesses 1101 and 1102 and then assumes two defined locking positions 1111 and 1112 (where one of the locking positions corresponds, for example, to the 90° position of the arms and the other to the 135° position of the arms).

[0267] When the locking lug 901 is in the locking position 11 11, the pivot joint is stably fixed in a specific angular position or arm position. If the user rotates one arm clockwise relative to the other, the locking lug 901 is moved to the right, as shown in Figure 6. In a first phase, a considerable force must be applied to move the locking lug 901 upwards along one side wall of the, for example, V-shaped locking recess 1101. The internal joint force F, resulting from the spring-loaded bearing 13 of the locking lug 901, tends to return the locking lug 901 to the locking position 1 111. In this case, this force acts counterclockwise and is therefore shown in the negative region of the ordinate.

[0268] As soon as the locking lug 901 leaves the locking recess 1101, it enters the unstable resistance area 1301 of the transport area 1201. Because the connection angle here is greater than zero and points in the opposite direction to the side wall of the locking recess, the internal force F jumps to a positive value because it points clockwise. The locking lug 901 is essentially on an inclined plane and is pushed away from the locking recess 1101 and towards the central area 1303 of the transport area 1201.

[0269] Due to the friction between the locking lug 901 and the guide surface 8, the locking lug will not move to the center of the transport area 8 on its own. Rather, it will come to a standstill as soon as the friction is greater than the force F. This can occur, for example, when the differential angle becomes less than 10°. If the user rotates the joint, they can move it relatively freely back and forth without a locking position occurring and without having to exert significant force.

[0270] When the locking lug 901 approaches the opposite end of the transport area 8, the internal joint force F begins to act counterclockwise. This is evident in the diagram in Figure 6, where the force F is in the negative range (i.e., counterclockwise force). The user must now overcome noticeable resistance to move the arms further and bring the locking lug 901 into the area of ​​the locking recess 1102. When the locking lug 901 reaches the sloping side wall of the V-shaped locking recess 1102, the internal joint force F jumps to a positive value (clockwise) and drives the locking lug 901 into the locking position 1112.

[0271] As this explanation makes clear, when operating the swivel joint, the user feels resistance before the transport area is left and the locking lug can snap into the locking recess.

[0272] The resistance areas, 1302, therefore serve to drive the locking nose 901 away from the locking recess 1102 towards the center of the transport area.

[0273] Figure 7 shows the reversible joint in cross-section parallel to the mirror plane of the ring body. The section plane of Figure 7 is slightly offset in the direction of the axis 7 of the reversible joint.

[0274] The arms 201, 202 assume a position in which they point diametrically outwards (180° position). In the present embodiment, this is the end position of the arms. According to a particular embodiment of the invention, a clearance 21 is provided. According to the invention, this clearance is provided inside the pivot joint. In the present example, it is formed inside the second half-shell 602. The clearance 21 thus forms a cavity inside the ring body, and in the present example, this cavity is open radially outwards.

[0275] The first half-shell 601 has an engagement element 22 that engages into the free space 21. The engagement element 22 is a block-like element whose circumferential dimension of the pivot joint is much smaller than the dimension of the free space 21. Thus, the engagement element 22 can move back and forth within the free space 21 according to the permissible angular range of the pivot joint.

[0276] According to a particular embodiment, the engagement element 21 projects radially from the first half-shell 601 towards them (i.e., towards the geometric axis of rotation of the pivot joint). The clearance 21 defines and limits the angular range over which the arms 201, 202 can move (open and close) to their maximum extent.

[0277] The clearance 21 extends in a circular arc from a first end stop 2101 to a second end stop 2102. The length of the clearance 21 in the circumferential direction minus the width of the engagement element 22 in the circumferential direction gives the permissible angular clearance of the rotary joint.

[0278] The locking lugs 901, 902 are mounted on the first half-shell 601 and, according to a particular embodiment of the invention, point in a radial direction towards the center of the pivot joint.

[0279] By forming both the locking lugs 901, 902 and the engagement element on the same half-shell, a great deal of freedom is achieved in the design and extent of the clearance 21. According to a particular embodiment of the invention, in Figure 7 the engagement element 22 is positioned directly adjacent to one of the locking lugs 901. For example, the engagement element 22 and the locking lug 901 are located in two positions that are offset azimuthally from each other by no more than 30°.

[0280] Figure 8 shows again the combination of interdental brush holder and cover cap. The ring body of the interdental brush holder 1 has a central opening 4011. The interdental brush holder 1 is positioned in the insertion opening of the elongated cover cap 50. The cover cap 50 has a length (longitudinal direction 502) that is at least approximately twice its width (transverse direction 501). The thickness of the cover cap 50 (not shown) is preferably constant along its longitudinal direction 502. At the longitudinal end opposite the insertion opening 503, the cover cap 50 is rounded in a semicircular shape. This allows it to be easily inserted into a case or a small storage bag.

[0281] The ring body of the interdental brush holder sits centrally in the insertion opening 503. The diameter of the ring body 401 is essentially the same as the width of the cover cap. Because the interdental brush holder thus does not protrude laterally beyond the cover cap in the transverse direction, the risk of the cover cap 50 being accidentally removed from the interdental brush holder during transport is reduced.

[0282] According to a particular embodiment, the side wall 504 of the cover cap 50 has a concave edge 506 in the area of ​​the insertion opening 503. The edge 506 is, for example, arc-shaped and has a radius of curvature that is at least equal to or greater than the radius of curvature of the ring body 401 at the ring body's mirror plane. In the present example, the radius of curvature of the concave edge is approximately four times the radius of curvature of the ring body.

[0283] Figure 9 shows the combination when the interdental brush holder 1 is inserted into the cover cap with only one arm. The user can guide the interdental brush by holding the cover cap 50 in their fingers. The cover cap 50, with its side wall 504, offers a larger and even more comfortable grip than the ring body 401.

[0284] It should be noted at this point that arm 202 has a locking element in the form of a projecting knob 2012, which can interact with a locking element inside the cover cap to stabilize the arm in the cover cap. In the present example, the locking element 2012 is a dome-shaped projection on the side of arm 202. The projection extends in a direction parallel to the axis of the pivot joint.

[0285] Because a similar locking mechanism is provided on the other arm, which is inserted into the cover cap in Figure 9, the interdental brush holder is already held stably and reliably by one arm within the cover cap. Figure 10 shows a preferred embodiment of the invention. The two ring-shaped half-shells 601, 602 are shown with their inner surfaces facing upwards. The ring body is produced by rotating one half-shell 180° around the longitudinal axis of the arm and then clipping it onto the other half-shell. Thus, according to a particular embodiment, the interdental brush holder consists of two separate pieces. Each piece (half-shell with molded-on arm) is preferably an injection-molded plastic part. Each of the half-shells therefore forms a toroid-like body.

[0286] The second half-shell 602 shows internal elements (i.e., elements hidden inside the ring body) such as a guide surface with detent recesses, 1102, 1103 and with transport areas, 1202.

[0287] The first half-shell 601 has hook-shaped ring segments 1601, 1602, 1603, 1604 in profile, which project beyond the plane of the ring body (see Figure 3) in the direction of axis 7. The ring segments 1601, 1602, 1603, 1604 are spaced apart from each other circumferentially. The ring segments serve to couple the two half-shells 601, 602. The other, or second, half-shell 602 has rib-shaped ring segments 1701, 1702, 1703, 1704, which are provided on the outside of the wall of the half-shell in a radial direction from the center (see Figure 5) of the ring body. The rib-shaped ring segments 1701, 1702, 1703, 1704 are located in the region of the ring body's mirror plane and are arranged in such a way that they can interact with the hook-shaped ring segments 1601–1604. The hook-shaped ring segments can thus engage behind and clamp onto the rib-shaped ring segments.The type of coupling of the two hemispheres 601, 602 allows a rotation of the hemispheres relative to each other.

[0288] According to a particular embodiment of the invention, the hook-shaped ring segments 1601, 1602, 1603, 1604 are provided on a wall of the half-shell 601 that is located on the outside with respect to the center of the ring body. "On the outside" means that this wall is located further away from the center than the "inner" wall of the ring body that defines the central passage. The rib-shaped ring segments 1701, 1702, 1703, 1704 are located on a wall of the half-shell 602 that is located on the outside with respect to the center of the ring body.

[0289] In the middle of the hemispheres 601, 602, the central passage 4011 of the ring body can be seen.

[0290] The locking lugs 901, 902 interact with the guide surface 8 when the two half-shells 601, 602 are coupled together. It is also apparent that, according to a particular embodiment of the invention, the guide surface 8 is offset in the axial direction (see axis 7 in Figure 3) relative to the clearance and the engagement element 22. The arms 201, 202 each have a coupling 1901, 1902 at one end for the interchangeable attachment of interdental brushes. These couplings can have various forms, for example, bayonet, plug-in, or clamp couplings, for securing an interdental brush.

[0291] Figure 11 shows the parts depicted in Figure 10 rotated by 90°.

[0292] The arc-shaped free space 21 with two end stops, 2102, is shown on the second half-shell 602. The free space 21 is provided on the inner wall 6022 of the half-shell 602. The inner wall 6022 defines or limits the central passage 4011 of the ring body.

[0293] A block-like engagement element 22 can be seen on the first half-shell 601. It projects inwards in a radial direction (relative to the geometric axis 7 of the pivot joint). When the two half-shells 601 and 602 are coupled, the engagement element projects into the free space. This explanation makes it clear that the free space and the engagement element are protected inside the toroidal body of the pivot joint.

[0294] Figure 11 shows a rod-shaped element 18, which is anchored at one end 1802 to the half-shell 601. The other end of the rod-shaped element is a free end 1801. The locking lug 901 is formed at the free end 1801. Because the rod-shaped element 1801 is elastically deformable to a certain extent (in particular, bendable), it provides a resilient bearing for the locking lug 901 (in the sense of a specific structural embodiment of the schematic Figure 5). The resilient bearing of the locking lugs ensures that they are pressed against the guide surface.

[0295] Figure 12 shows a cross-section of the interdental brush holder in a plane perpendicular to the ring body mirror plane.

[0296] The ring body 401 of the interdental brush holder is positioned outside the cover cap 50, while the arm 201 is inserted into the cover cap 50. The geometric axis 7 represents the axis of rotation of the swivel joint. Furthermore, the thickness DT of the torus-like body (ring body 401) is shown, which essentially corresponds to the thickness of the cover cap 50. The thickness DT of the ring body is measured in the direction of axis 7.

[0297] According to a particular embodiment of the invention, the thickness DT is essentially the same as the thickness of the interior of the cover cap.

[0298] Figures 12, 13 and 14 further show that the half-shell 602 has an inner wall 6022 (facing the axis 7) and an outer wall 6021 (facing away from the axis 7). It is also evident that the ring body has a closed interior in which the elements according to the invention, such as the locking lug and guide surface, are concealed.

[0299] According to a particular embodiment of the invention, guide elements 508, 509, 510 are formed on the inner side of the cover cap for each arm 201, 202. In the present example, the arms 201, 202 are circular in cross-section perpendicular to their longitudinal axis. In this embodiment, the guide elements 508, 509, 510 are grooves extending longitudinally along the cover cap 50. The two guide elements 508, 509, which are provided for one arm, are directly opposite each other with respect to the thickness direction of the cover cap 50. The interior of the cover cap 50, next to the grooves, is slightly less thick than the diameter of an arm. In the area of ​​the grooves, the thickness is essentially as large as the diameter of an arm. The outermost cross-sectional area of ​​the arm projects forward with respect to a plane parallel to the side wall of the cover cap. This area of ​​the arm thus engages in the grooves.Thus, the grooves form two guide elements 508, 509 diametrically opposite to the arm for the arm 201. The arm 201 is thus held or guided stably transversely to the longitudinal direction of the cover cap.

[0300] Furthermore, each arm has two locking elements, e.g., in the form of protruding studs 2011 and 2012. The studs 2011 and 2012 protrude in a direction parallel to axis 7. Recesses 5011 and 5012 are provided on the inner wall of the cover cap. These are positioned such that the studs 2011 and 2012 can engage in the recesses 5011 and 5012 when the interdental brush holder is in the target position in the cover cap.

[0301] Figure 12 also shows one of the recesses 5013 for the second arm.

[0302] At the concave edge 506, the interior of the cover cap 50 is widened. Consequently, the wall thickness of the side wall 504 tapers slightly towards the concave edge 506, as can be seen in Figure 12. This has the advantage that the ring body can immerse itself in the opening of the cover cap and that, in the target position—that is, when the studs 2011, 2012 engage in the recesses 5011, 5012—the ring body is clamped laterally and thus held securely. The outermost area of ​​the circular cross-section of the arm forms a projection that can engage in the first guide element (channel), resulting in longitudinal guidance and corresponding fixation for the arm.

[0303] From the above explanations, it follows that, in a particular embodiment of the invention, a first guide element 508, 509 is provided on the inside of the cover cap, and a second guide element (in the form of the outermost region of the circular cross-section) is provided on one arm of the interdental brush holder. The two guide elements are designed such that the arm receives linear guidance in the longitudinal direction 502 of the cover cap 50 when inserted into the cover cap. Figure 13 shows a top view of a cover cap made of transparent plastic. The channel-shaped guide elements 508, 510 are located on the inside of the cover cap but are visible from the outside in this example due to the transparency of the cover cap material 50. The recesses 5012, 5013 located on the inside of the side wall 504 are also shown. The recesses 5012, 5013 are positioned on or in the guide elements 508, 510.

[0304] For the sake of better readability of Figure 13, the arms and interdental brushes are not shown in the cover cap.

[0305] The examples of implementation can be modified in many different ways.

[0306] The features of the cover cap can be used independently of the interdental brush holder, which has a swivel joint in the form of a ring body.

[0307] The features of the internal end stops (clearance, engagement element) of the rotary joint can be used independently of the cover cap. They can also be used independently of the use of a ring body.

[0308] The arms can also have a square cross-section. If the orientation of the square cross-section is such that two opposite corners of the cross-section engage in the grooves (guide elements) in the cover cap, the cover cap can be used for both square and circular arm cross-sections.

[0309] The ring body can have a material plate that closes off the opening instead of a central opening. The material plate is, for example, arranged in the mirror plane of the ring body. Viewed from both sides in a top view, the ring body then has a depression that helps to hold it between the fingertips.

[0310] The ring body can, for example, have an octagonal outer shape. Each half-shell then also has an octagonal outer shape. If one half-shell is rotated 45° relative to the other, the octagonal shapes of the half-shells align again. In every 45° detent position (or in every multiple of 45°) of the swivel joint, the ring body again has an octagonal outer shape.

[0311] In the embodiments described above, the cover cap has a box-like interior. However, the cover cap can also have a contoured interior, meaning an interior whose contour is adapted to the contour of the arms of the interdental brush holder. If the contour is largely adapted to the arms, guide elements in the form of grooves can be omitted. The guide elements provided inside the cover cap can also be ribs. Similarly, the guide elements on the arms can also be grooves or recesses.

[0312] The locking lugs can be rounded instead of V-shaped in the area where they come into contact with the guide track.

Claims

Patent claims 1. Interdental brush holder (1) with two arms (201 , 202) which are connected to each other via a pivot joint (4), wherein a) the pivot joint has two half-shells (601 , 602) which are mechanically rotatable to each other about a geometric axis of rotation (7) of the pivot joint; b) a first arm of the two arms (201 , 202) is fixed to the first half-shell and a second arm of the two arms (201 , 202) is fixed to the second half-shell; c) in the first half-shell (601) a guide surface (8) and in the second half-shell (602) a locking lug (901 , 901) are arranged such that the locking lug (901 , 902) is displaceable along the guide surface (8) on a guide line (10) and can engage in at least two spaced-apart locking positions (1101 , 1102) formed by locking recesses (1101 , 1102, 1103, 1104) in the guide surface (8), characterized in that d) the guide surface (8) is located between two adjacent locking recesses (1101 , 1102;1102, 1103) has a transport area (1201 ; 1202), e) and that the transport area (1201) adjacent to the detent recesses (1101 , 1102) each has an unstable resistance area (1301 , 1302) which drives the detent nose (9) away from the detent recess (1101 , 1103) and towards a center (14) of the transport area (1201).; 2. Interdental brush holder according to claim 1, characterized in that the pivot joint (4) has a toroid-like joint body, in particular a ring body (401) and the arms (201, 202) are rotatable about a geometric axis (7) of the toroid or ring body (401) in a toroid mirror plane or ring body mirror plane (5) defined by the toroid-like joint body, in particular the ring body (401).

3. Interdental brush holder according to one of the preceding claims, characterized in that the transport area (1201 , 1202, 1203, 1204) measured on the guide line (10) is at least twice as long, in particular at least four times as long, as the detent recess (1101 , 1102).

4. Interdental brush holder according to one of the preceding claims, characterized in that the locking recesses (1101 , 1102, 1103, 1104) are V-shaped and that the transport area (1201 , 1202, 1203, 1204) is in particular straight.

5. Interdental brush holder according to one of the preceding claims, characterized in that the resistance area (1301 , 1302) is formed by the transport area (8) adjoining a detent recess (1101 , 1102) with a connection angle greater than 0° with respect to a detent lug reference line (101), in particular that the connection angle (801) is at least 10°, particularly preferably at least 20°.

6. Interdental brush holder according to one of the preceding claims, characterized in that the locking lug (9) has an elastically spring-loaded bearing (13) so that it is pressed against the guide surface (8).

7. Interdental brush holder according to one of the preceding claims, characterized in that the guide surface (8) has no more than six detent recesses (1101 , 1102, 1103, 1104, 1105, 1106) and that these detent recesses define four angular positions of the swivel joint, in particular an angular position at 0°, one at 90°, one at 135° and one at 180°.

8. Interdental brush holder according to one of the preceding claims, characterized in that the pivot joint (4) has two locking lugs (901 , 902), wherein the locking lugs (901 , 902) are in particular in a diametrically offset position on the pivot joint.

9. Interdental brush holder according to one of the preceding claims, characterized in that for rotatable coupling of the half-shells (601 , 602) one of the two half-shells has at least one ring segment (1601 , 1602, 1603, 1604) with a hook-shaped cross-section and the other of the two half-shells has at least one ring segment (1701 , 1702, 1703) with a rib-shaped cross-section.

10. Interdental brush holder according to one of the preceding claims, characterized in that the guide surface (8) is directed away from the center (15) of the ring body (401), in particular is directed substantially radially outwards, and that the locking lug (901 , 902) is directed towards the center (15) of the ring body (401). 1 1. Interdental brush holder according to the preceding claims, characterized in that the guide surface (8) is formed on an inner wall located inside the ring body (401), which limits the central passage (4011), and that the guide surface (8) is open in a radial direction towards the outside with respect to the ring body (401). 1 2. Interdental brush holder according to one of the preceding claims, characterized in that the arms (201 , 202) are attached to the ring body in such a way that they lie parallel next to each other in a ring body mirror plane at a 0° position.

13. Interdental brush holder according to one of the preceding claims, characterized in that the arms (201 , 202) have a coupling (1901 , 1902) at an end facing away from the ring body for attaching an interdental brush (301 , 302), in particular that the coupling (1901 , 1902) is designed in the form of a bayonet coupling, a plug coupling or a clamp coupling.

14. Interdental brush holder with two arms (201, 202) connected to each other via a pivot joint (4), in particular according to one of the preceding claims, wherein a) the pivot joint (4) has two half-shells (601, 602) which are mechanically rotatable together about a geometric axis (7); b) the first of the two arms (201) is fixed to the first half-shell (601) and the second of the two arms (202) is fixed to the second half-shell (602); characterized in that c) the first half-shell has an arc-shaped free space (21) extending around a center of the ring body with two end stops (2101, 2102); d) and the other half-shell has an engagement element that projects into the arc-shaped free space.

15. Interdental brush holder according to the preceding claim, characterized in that the free space (21) extends over a semicircle and defines on the one hand a 0° position of the arms and on the other hand a 180° position of the arms.

16. Interdental brush holder according to one of the preceding claims, characterized in that the free space (21) is formed on an inner wall located inside the ring body, which limits the central passage (4011) and is open in a radial direction towards the outside with respect to the ring body.

17. Combination of interdental brush holder (1) according to one of the preceding claims and a cover cap (50), wherein the arms (201 , 202) can be inserted into an insertion opening of the cover cap in an 0° position and are consequently housed in the cover cap, such that a predominant part of the pivot joint (4) lies outside the cover cap (50).

18. Combination according to one of the preceding claims, characterized in that the cover cap (50) of the insertion opening has a side wall with a concave edge (503) which at least approximately follows a contour of the pivot body (401).

19. Combination according to one of the preceding claims, characterized in that a first guide element (508, 509) is provided on an inside of the cover cap, or a second guide element is provided on one arm of the interdental brush holder, wherein the first guide element or the second guide element is designed such that the arm (201, 202) receives linear guidance in the direction of an insertion movement when inserted into the cover cap (50).

20. Combination according to one of the preceding claims, characterized in that a locking means is provided which holds the arm in the inserted position in the locking cap.

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