Robotic lawnmower bumper

Abstract

The invention relates to a bumper (12) for an autonomous lawnmower (10) or service robot, in particular a lawnmower robot bumper, comprising a first and a second main wall (14, 16) spaced apart from one another and a plurality of supporting walls (18, 20) connecting the first and the second main wall (14, 16). It is proposed that the plurality of supporting walls (18, 20) each have two wall sections (22, 24, 26, 28) which are aligned at an angle, in particular at an isosceles angle, to one another and do not intersect. Bumper (12) for an autonomous lawnmower (10) or service robot, in particular a lawnmower robot bumper, comprising a first and a second spaced-apart main wall (14, 16) and a plurality of supporting walls (18, 20) connecting the first and the second main wall (14, 16).

Description

Prior ArtLawn mower robot bumpers according to the preamble of claim 1 are already known.Disclosure of the InventionThe invention relates to a bumper for an autonomous lawnmower or service robot, in particular lawn mower robot bumper, having the features of at least one independent claim. Advantageous further developments are evident from the dependent claims.The bumper according to the invention, in particular lawn mower robot bumper, can be used to absorb or dampen impacts caused by collisions with objects in an improved manner. Both the object and a bumper-equipped autonomous lawn mower or service robot can be protected from damage. High device integration can be achieved. A homogeneous force distribution of a piston and / or a constant compression can be achieved. Due to the construction according to the invention, a load during the compression of the bumper can be distributed uniformly, in particular transmitted to the autonomous lawn mower or service robot. A collision of support elements or ribs under compression can be avoided. A folding and / or bending of the support elements or ribs, in particular relative to one another and not per se, can be carried out in a controlled or predictable manner. A high degree of compression of the bumper can be achieved. In the case of compression, the main walls and supporting walls can abut each other at least almost completely. A cavity volume in the bumper can be reduced to a minimum in the event of compression at least at the compression point. A material outlay and / or weight of the bumper can be kept low by the construction of the bumper according to the invention. The safety and / or stability, in particular of an autonomous lawnmower or service robot equipped with the bumper, can be increased.The invention is based on a bumper for an autonomous lawn mower or service robot, in particular a lawn mower robot bumper, having: a first and a second main wall spaced apart from one another and a plurality of supporting walls or ribs connecting the first and the second main wall.It is proposed that the individual supporting walls or ribs each have two wall sections which are oriented at an angle, in particular at an isosceles angle, with respect to one another and in particular do not cross one another. The support walls are in particular V-shaped. A wall section corresponds in particular to a limb of the V. The supporting walls are in particular not of X-shaped design, i.e. preferably do not cross one another.The first and the second main wall spaced apart from one another have a course, in particular running substantially parallel to one another, or are aligned parallel to one another. Substantially parallel is to be understood here as meaning in particular an angular deviation in a longitudinal axis direction of the main walls of up to 5°, but is preferably 0°. Substantially parallel is to be understood here as meaning in particular an angle deviation in a vertical axis direction of the main walls of up to 10°, in particular <5°, preferably 1-4°. In the vertical direction or vertical axis direction of the main walls, these can, as it were, slightly taper or diverge. In the horizontal direction or longitudinal direction of the main walls, these extend in particular almost parallel to one another. This applies at least to the relaxed, non-elastic or sometimes also plastically deformed or deformed state of the bumper. The support walls are provided in particular for the purpose of transmitting an impact force from the first main wall in a damped manner to the second main wall by elastic deformation, in particular a chassis or housing of the autonomous lawnmower or service robot which is directly connected to the second main wall. Vertical axes of the main and supporting walls are aligned substantially parallel to one another. The plurality of supporting walls are in particular formed spaced apart or offset from one another. A plurality of the plurality of supporting walls are in particular aligned parallel, preferably parallel offset to one another. A plurality of the plurality of supporting walls, in particular one half each of the plurality of supporting walls, are in particular formed offset parallel to one another. In particular, one half on the one side and the other half on the other side of a center, or preferably a mirror symmetry plane of the bumper. Each support wall may have two wall sections or wall segments which enclose an acute angle with respect to one another. These are formed in particular at an isosceles acute angle to one another. The support walls also form an acute angle with the main walls. In particular, an acute angle between the wall sections or wall segments of the support angle is smaller than an acute angle between the main wall connected to the respective wall section or wall segments.It is proposed that the bumper has a mirror symmetry plane and support walls are arranged in pairs mirror-symmetrically to the mirror symmetry plane and are in particular formed so as to project in the opposite direction, in particular so as to project exclusively in the opposite direction. Projecting in the opposite direction is to be understood in particular to mean that the region of the supporting walls between the connecting regions of the supporting wall to the first and second main walls is arranged further away from the mirror symmetry plane than the connecting regions of the supporting wall to the first and second main walls. With respect to the mirror symmetry plane, a geometry is thus formed in particular as follows from "...<<<|>>>..." - wherein the vertical line corresponds to the mirror symmetry plane and the vertices of the "larger" or "smaller" characters point on both sides away from the mirror symmetry plane. The bumper is constructed in particular mirror-symmetrically. It has in particular two sides or two halves which are formed mirror-symmetrically to one another. The main walls can have a slight bend to one another in particular in the region of the center. Thus, the bumper can form a front-side, in particular blunt, tip. The first and second main walls can each have an obtuse angle on both sides of the center of the bumper or of a plane running through the center, or on both sides of the mirror symmetry plane, thus in particular on the rear side. The angle is in particular between 165°-180°, preferably 170°-175°. Support walls on both sides of the mirror symmetry plane are thus each arranged at the same distance from the mirror symmetry plane, in particular mirror-symmetrical in pairs. A plurality of supporting walls on the respective sides of the mirror plane of symmetry are formed parallel to one another. They are shaped like chervone or chervone, in particular offset from one another. In the middle, preferred. On the plane running through the center, in particular on the mirror symmetry plane, no supporting wall is provided. The region of the center of the bumper is instead free of support walls. The first support walls which are situated mirror-symmetrically opposite one another begin outside the center, in particular projecting in opposite directions. Starting from the center of the bumper, they do not touch each other at least in the relaxed or unloaded state of the bumper. They form with the main walls essentially a hexagon. Preferably, the oppositely projecting arrangement can be used to absorb or dampen impacts acting on one side of the bumper or on the one side of the mirror symmetry plane of the bumper, in particular on the one hand under high compression, and on the other hand preferably the opposite side can help so to speak when the compressed first main wall is reset towards the center. By means of the construction, a high compression capacity and a recovery of the first main wall in the opposite direction of impact can be achieved.It is proposed that the plurality of support walls are each formed by two V-shaped and / or chevron-shaped and / or acute-angle wall sections, in particular isosceles wall sections oriented acute-angle to one another. Preferably, one half of the plurality of support walls is formed in an oppositely chevron-shaped manner and / or at an acute angle to the other half of the plurality of support walls. Preferably, support walls and / or wall sections thereof are formed offset parallel to adjacent support walls or wall sections thereof. The above-mentioned positive effects or advantages can also be achieved thereby.The bumper can thus have a mirror symmetry plane in the middle, wherein a support wall of the support walls, with respect to the mirror symmetry plane, is formed mirror-symmetrically with respect to the support wall of the support walls opposite it. The wall segments of the opposite support walls thus have opposite opening angles or are projecting in opposite directions. The wall segments of the respective supporting wall are in particular embodied with equal sides to one another. They thus have in particular an identical length. They enclose an identical angle with the main walls, in particular in the region of the connection to the respective main wall or in the connecting region.It is proposed that an angle of the chevron-shaped and / or acute-angle wall sections or wall segments oriented with respect to one another is 45° to 85°, in particular an angle of 75° or 67.5°. This allows a high, but also defined, compression of the main walls with respect to one another. Compared to a support wall formed perpendicular to the main wall or intersecting wall segments or wall sections of a support wall, undefined compression or any desired bending can thus advantageously be avoided.It is proposed that a length of the wall sections of a support wall is smaller than or equal to the distance of a support wall from the adjacent or next support wall, in particular a length of the wall sections substantially corresponds to the distance of adjacent support walls aligned parallel to one another. As a result, a high compression capacity or a small remaining free compression volume, in particular between the main walls, preferably in the case of compression of the bumper, can be achieved. A free space which is as small as possible, in particular a small free space which is not filled by support elements, between the main walls can be achieved during compression. Residual compression by elastic deformation of the walls which then abut one another, in particular of the walls which then abut one another (two main walls and two supporting wall wall sections), can then be as equal as possible, preferably in all regions of the bumper perpendicular to the first main wall. Thus, even very high forces can be transmitted as homogeneously as possible to the chassis or housing of the autonomous lawnmower or service robot, in particular without adversely affecting the stability of the autonomous lawnmower or service robot to track. However, a displacement of the autonomous lawnmower or service robot could occur if the supporting walls and / or wall sections would in particular buckle in an uncontrolled manner, or if they were provided in addition to hard compression regions.The bumper can be designed closed on three sides, in particular on the front, rear and upper sides. Preferably, a side facing a substrate, in particular a bottom side, is open. The bumper can thus be produced in a simple manner and / or in one piece. A visual check of the state of the supporting walls is also possible in a simple manner by a user, for example. Material can be saved. Large-area air escape during compression of the bumper can be achieved.It is proposed that the main walls have a different height, in particular wherein a ceiling wall connects the spaced main wall in an inclined roof-like manner, preferably at an angle of 30-60°, in particular 50°. It is proposed that support walls be connected to the two main walls and the ceiling wall connecting them obliquely. Preferably, a front main wall or the first main wall can have a lower height than a rear main wall. A height of wall sections of the support wall between the first and second main walls may increase, in particular continuously. In particular, at least the front-side or first main wall can have a varying height, preferably a height increasing from the center or the mirror symmetry plane of the bumper to its sides or lateral regions. This can increase the rigidity of the bumper. A good self-cleaning of the bumper can be achieved by rain or the like. A compressive strength can be varied by the height variation, in particular to the sides of the bumper, and / or smaller main wall distances in lateral regions can be compensated by higher supporting walls and / or higher wall portions.It is proposed that the bumper be formed from a dimensionally elastic material, in particular from a preferably elastic or rubber-like plastic, in particular from rubber. The bumper is formed in particular from polyurethane. It preferably has a resistance force up to complete elastic compression of the two main walls with respect to one another of <300N, in particular <150N, preferably <50N. It is provided in particular for lowering force peaks in the event of a collision to below 260N. It has in particular a compression path of 10-30 mm, in particular around 15-20 mm. As a result, at speeds <10 km / h, in particular <5 km / h, and / or weights <20 kg, in particular <10 kg, of an autonomous lawnmower or service robot equipped with the bumper, impacts on objects, for example trees, rods, stones, furniture or the like, can be damped in a defined manner. Damage to the objects or the autonomous lawn mower or service robot equipped with the bumper can be avoided.It is proposed that the two main walls have a distance which is greater than the distance between adjacent support walls, in particular less than 50% greater, preferably about 20-30% greater, in particular about 25% greater. A good ratio of compression capacity and defined compression behavior can thereby be achieved. In particular, a compression behavior is relatively constant over at least the entire front side of the bumper.It is proposed that a main wall is about 50-150%, in particular about 50-100%, thicker than a supporting wall. As a result, impact or compression forces acting on the main wall can be distributed at least to a plurality of supporting walls. The compression behavior of the bumper can be positively influenced.It is proposed that the bumper can be connected to the chassis or a housing of the autonomous lawnmower or service robot via latching elements, in particular having a main direction of extent substantially parallel to a horizontal plane. As a result, for example, a tool-free fixing of the bumper to the chassis or a housing can be achieved.It is proposed that the bumper has form-fitting elements for the sliding connection to the chassis and / or the housing of an autonomous lawnmower or service robot. These preferably have a main extension direction perpendicular to the horizontal plane. The form-fitting elements have in particular a T-shaped cross section. They are preferably arranged on the rear side of the second or rear main wall. In this way, a tool-free fixing of the bumper to the chassis or a housing can be achieved. A secure connection to the chassis or housing can be achieved. The rear side of the bumper or the rear main wall is provided in particular for resting directly, preferably in a planar manner, on the chassis and / or the housing of the autonomous lawnmower or service robot. In particular via correspondingly designed contact surfaces. Thus, the in particular flexurally soft rear side of the bumper, or the rear main wall, is supported by the chassis and / or the housing. Impacts can be transmitted to the chassis or housing in a planar and / or damped manner, in particular as homogeneously as possible.In addition, an autonomous lawn mower or a service robot, having an aforementioned bumper, in particular a lawn mower robot bumper, is proposed. A "service robot" is to be understood in particular as an at least partially automatic mobile device which at least partially automatically performs a work, preferably a machining of a surface-in particular a so-called machining surface. In particular, the robot is intended to automatically begin a work, automatically end it, and / or automatically select and / or influence at least one parameter relating to the machining of the machining surface. Furthermore, a device is to be understood in particular which moves automatically at least for performing this work, in particular for machining the machining surface, and / or moves autonomously in the predefined working area of the machining surface. Typical application areas of such robots include various activities such as sweeping, sucking, cleaning, mowing lawns, (collecting), sorting, watering, fertilizing, mapping, or the like. Examples thereof are, in particular, autonomous sweeping machines, autonomous cleaning robots, autonomous snow removing robots, autonomous vacuum cleaners, autonomous swimming pool cleaning machine, autonomous ground wiping robots, autonomous sowing machines, autonomous irrigation robots, autonomous fertilizing machines, autonomous mapping machines, autonomous lawn mowers or the like. Such service robots have in particular a weight of less than 40 kg, preferably less than 20 kg, in particular less than 10 kg. Accordingly, the bumper is designed in particular for service robots of such weight classes.DRAWINGFurther advantages are evident from the following description of the drawings. The drawing shows an embodiment of the invention. The drawings, specification and claims contain numerous features in combination. The skilled person will expediently also consider the features individually and summarize them to form meaningful further combinations.The following are shown: FIG. 1 shows an autonomous lawnmower or service robot with a bumper according to the invention, in particular a lawn mower robot bumper, FIG. 2 shows the bumper according to the invention in a side view, FIG. 3 shows the bumper according to the invention in a perspective view obliquely from above, FIG. 4 shows the bumper according to the invention in a perspective view obliquely from below, FIG. 5 shows the bumper according to the invention in a bottom view, FIG. 6 shows the bumper according to the invention in a sectional illustration through the mirror plane of symmetry.DESCRIPTION OF THE EMBODIMENTFIG. 1 shows an autonomous lawn mower 10 or a service robot with a bumper 12 according to the invention, in particular a lawn mower robot bumper. The bumper 12 is arranged on a front side 40 of the autonomous lawn mower 10, but could also be arranged on a rear side, for example. The autonomous lawn mower 10 includes a housing 100. It has a chassis 102. It may have a cover housing 104 covering the chassis 102. The autonomous lawnmower 10 has a drive unit 106 for driving wheels 108, in particular electric motors for single-wheel drive. It has an energy supply unit 118, for example a rechargeable battery pack, in particular a handheld power tool replaceable rechargeable battery pack. It can have, in particular at the front, rollers 116, which are not driven here and are designed as follower rollers. The autonomous lawn mower 10 includes a drive unit 110 for driving a cutting unit 112 or another service unit. The autonomous lawn mower 10 or the service robot has a control or regulating unit 114. It can have sensors or a sensor unit (not shown). It can have a navigation unit. It can have further protection devices and / or a multiplicity of further features which are known to the person skilled in the art with autonomous lawn mowers or lawn mower robots or service robots. The autonomous lawn mower 10 or service robot is configured to independently perform a service in a working environment, in particular to independently mower a lawn area.The bumper 12 is substantially U-shaped. It may comprise a plastic. It is formed in particular from rubber or a rubber-like plastic. It is in particular formed in one piece, in particular produced in an injection molding process. In particular, it is not formed from metal, in particular not from metallic components. In particular, it covers an angular range of 180°. It may be disposed around a front portion of the chassis 102 and below the upper cover housing 104. The bumper 12 may also be attached to or extend around other parts of the service robot. The bumper 12 may be secured to the chassis 102 by mechanical fasteners.FIGS. 2 to 5 show the bumper 12 according to the invention in different views; FIG. 6 is a sectional illustration through a center 76 of the bumper 12 or in a mirror symmetry plane 30 of the bumper 12.The bumper 12 includes first and second spaced apart main walls 14, 16. The main walls 14, 16 are aligned substantially parallel to one another or running parallel to one another (cf. in particular. FIG. 5 ). Substantially here, an angle deviation in the longitudinal axis direction of up to 5°, preferably 0° and / or in the vertical axis direction of up to 10°, in particular <5°, preferably 1-4°, is to be understood. The main walls 14, 16 thus extend in particular in the longitudinal direction 92 without any angular deviation from one another. In the vertical direction 94, a slight angular deviation can occur, as described further below. The main walls 14, 16 can have a slight bend 96 in the region of a center 76 or a mirror symmetry plane 30 of the bumper 12. The respective main walls 14, 16 can thus have an obtuse angle 80 on both sides of a plane 78 running through the center 76 of the bumper 12 or on both sides of the mirror symmetry plane 30, in particular of >170 °, here of around 173.5°.The bumper 12 includes a plurality of support walls 18, 20 connecting the first and second main walls 14, 16. These are provided for the purpose of transmitting an impact force 56 from the first main wall 14 in a damped manner to the second main wall 16 by elastic deformation, for example when the autonomous lawnmower 10 is travelling against an object. As a result, a force peak during the collision can be reduced. The autonomous lawn mower and / or the counter sand may be protected. Main and support walls 14, 16, 18, 20 are aligned substantially perpendicular to a bottom side 46 and a horizontal plane 62 of the bumper 12, respectively. A vertical axis 84, 128 of the main and supporting walls 14, 16, 18, 20 is aligned substantially perpendicular to the underside 46 and to the horizontal plane 62, respectively. The vertical axes of the main and support walls 14, 16, 18, 20 are aligned substantially parallel to one another. An angle deviation of up to 10°, preferably of <5°, should also be included here. For example, the first or the front main wall 14, as can be seen from FIGS. 5 and 6, can have a vertical axis 84 which here has, for example, an angle 90 of 4° with respect to the vertical or vertical direction 82. The first main wall 14 can, as here, be inclined forwards by 4° with respect to the vertical and toward the underside 46. Main and support walls 14, 16, 18, 20 can each have a chamfer 86, a rounding or the like in their distal region 88, in particular toward the open underside 46. As can be seen from FIG. 6, the second main wall 16 can also have a vertical axis 128, which here has, for example, an angle 130 of 1° with respect to the vertical direction 82.The support walls 18, 20 each have two wall sections 22, 24, 26, 28 which are oriented at an angle, in particular at an acute angle, to one another. The two wall sections 22, 24, 26, 28 of the respective support walls 18, 20 are embodied with equal sides. They therefore have the same length 36. In particular, only two wall sections 22, 24, 26, 28 are provided for each support wall 18, 20. The two wall sections 22, 24, 26, 28 of the individual support walls 18, 20 do not cross each other. The support walls 18, 20 are formed spaced apart from one another. The support walls 18, 20 are formed extending parallel to one another or parallel to one another. In particular, in each case one half of the plurality of supporting walls 18, 20 are formed parallel offset to one another on both sides of the mirror plane of symmetry 30.The bumper 12 has a mirror symmetry plane 30. The supporting walls 18, 20 are arranged in pairs mirror-symmetrically to the mirror symmetry plane 30, between the main walls 14, 16. The support walls 18, 20 arranged in pairs mirror-symmetrically to the mirror symmetry plane 30 are designed to project in opposite directions. In principle, the oppositely projecting supporting walls 18, 20 could also assume a different shape than the one which is in particular angled with isosceles limits, for example a shape which projects convexly with respect to the mirror symmetry plane 30 or the like.A plurality of the support walls 18, 20 on the respective side of the mirror plane of symmetry 30 are configured so as to extend parallel to one another, in particular so as to extend parallel to one another in the longitudinal direction of the wall portions 22, 24, 26, 28.A plurality of the support walls 18, 20 are each formed by two chevron-shaped and / or acutely oriented wall portions 22, 24, 26, 28. In particular, equi-sided wall sections 22, 24, 26, 28 are aligned at an acute angle to one another. one half of the plurality of supporting walls 18, 20 is formed in an oppositely chevron-shaped manner and / or at an acute angle to the other half of the plurality of supporting walls. Adjacent support walls 20, 22, in particular on one side or the other of the center 76 of the bumper 12, are formed offset parallel to one another.It is proposed that the bumper 12 has a mirror symmetry plane 30 in the middle. A supporting wall 18 of the supporting walls 18, 20 is designed mirror-symmetrically with respect to the mirror symmetry plane 30, with respect to a supporting wall 20 of the supporting walls 18, 20 opposite it. Wall segments 22, 24, 26, 28 of the supporting walls 18, 20 thus have opposing opening angles 32. The wall segments 22, 24, 26, 28 of opposite support walls 18, 20 are formed in particular with isosceless with opposite opening angles. No support wall 18, 20 is arranged in the middle 76 or on the mirror symmetry plane 30. The region of the center 76 of the bumper is instead free of support walls 18, 20. They form with the main walls 14, 16 so to speak essentially a hexagon, in particular with two mutually opposite isosceles, in particular essentially diamond-shaped, opposite wall segments 22, 24, 26, 28. In the central region of the bumper 12, support walls 18, 20 and skin walls 14, 16 form an essentially hexagonal compression region, in particular wherein the support walls 18, 20 are indirectly connected via main walls 14, 16. In the central region or in the region of the mirror plane of symmetry 30, no support wall 18, 20 comes to lie, in particular in the relaxed state or in the state of the bumper 12 compressed at least from the front or from the front.It is proposed that an angle 32, 34 of the chevron-shaped and / or acute-angle wall sections 22, 24, 26, 28 is in particular 45° to 85°. According to FIG. 5, the angle is 32, 34, in particular 75° or 67.5°. As can be seen from FIG. 5, 7 of the support walls 18, 20 are each formed parallel to one another on both sides of the mirror symmetry plane 30, or they run parallel to one another. In a region 98, in which the bumper 12 merges into side parts 120, a further two supporting walls 18, 20 are arranged on both sides of the mirror symmetry plane 30. These are likewise of isosceles design. In the case of the above-mentioned 7 support walls 18, 20 in each case, the angle 32 is approximately 75°. In the case of the above-mentioned 2 support walls 18, 20 in each case in the transition region to the side parts 120, the angle 34 is approximately 67.5°.It is proposed that a length 36 of the wall sections 22, 24, 26, 28 is smaller than or equal to the distance 38 of a support wall 20 from the adjacent or next support wall 20, in particular a length 36 of the wall sections 22, 24, 26, 28 substantially corresponds to the distance 38 of adjacent support walls 20 aligned parallel to one another. The bumper 12 can be designed closed on three sides, in particular on the front, rear and upper sides 40, 42, 44. Preferably, a side facing a substrate, in particular the underside 46, is open.The main walls 14, 16 may have different heights 48, 50. A ceiling wall 52 connects the spaced apart main wall 14, 16, in particular in a sloping roof-like manner. An angle 54 of the ceiling wall 52 is in particular 30-60°, here for example 50°. A front main wall 14 can have a lower height 48, 50 than a rear main wall 16. The front main wall 14 can have a varying height 48, preferably an outwardly increasing height 48 proceeding from a center 76 or the mirror symmetry plane 30 of the bumper 12.The bumper 12 can be formed from a dimensionally elastic material or at least contain it, in particular plastic or rubber. In particular, the bumper is not formed from a metal or from metal components.Specifically, the bumper 12 is formed of polyurethane. The bumper 12 can have a resistance force up to complete elastic compression of the two main walls 14, 16 with respect to one another of preferably <300 N, in particular <150 N, preferably <50 N. In the fully compressed state, the wall sections 22, 24, 26, 28 of a supporting wall 18, 20 are aligned substantially parallel to one another. In the fully compressed state, the wall sections 22, 24, 26, 28 of a supporting wall 18, 20 are aligned substantially parallel to one another and parallel to the main walls 14, 16 supported by them. Wall sections 22, 24, 26, 28 of a supporting wall 18, 20 abut each other and abut the respective main walls 14, 16.It is proposed that the two main walls 14, 16 have a distance 72 which is greater than the distance 38 between adjacent supporting walls 18, 20. The two main walls 14, 16 have in particular a spacing 72 of approximately 15-25 mm, preferably approximately 20 mm. The distance 38 between adjacent supporting walls 18, 20 is in particular approximately 12-20 mm, in particular approximately 16 mm. The length 36 of a wall section 22, 24, 26, 28 is in particular approximately 12-20 mm, in particular approximately 16 mm. A thickness 74 of the supporting wall 18, 20 or of the wall sections 22, 24, 26, 28 is in particular approximately 1-2 mm, preferably approximately 1.5 mm. A thickness 132, 134 of the main walls 14, 16 is in particular around 1.5-4 mm, preferably around 2-3 mm. In particular, a thickness 132 of the first main wall 14 is approximately 3 mm, preferably a thickness 134 of the second main wall 16 is approximately 2-3 mm. A main wall 14, 16 can be about 50-150%, in particular about 50-100%, thicker than a supporting wall 18, 20.It is proposed that the bumper 12 can be connected to the chassis 64 or a housing 66 of the autonomous lawn mower 10 via form-fit elements, in particular latching elements 58 (cf. FIG. 3 ), in particular having a main direction of extent 60 substantially parallel to a horizontal plane 62. The latching elements 58 can be designed as longitudinal grooves. In particular, latching extensions of the chassis 102 come to lie in them. The cover housing 104 can in particular restrict play of the bumper 12 along the vertical axis 84 or in the vertical or vertical direction 82.The bumper 12 may further include positive locking elements 68, in particular for sliding connection to the chassis 64 and / or the housing 66 of the autonomous lawn mower 10. These preferably have a main extension direction 70 substantially perpendicular to the horizontal plane 62, i.e. preferably vertical. They have in particular a T-shaped cross section. They are preferably arranged on the rear side of the second or rear main wall 16. They are first of all, so to speak, as a T-beam vertically along the rear side of the second or rear main wall 16. The bumper 12 can be inserted in particular into correspondingly formed slots or grooves on the chassis 64 or alternatively on the housing 66. The bumper 12 can thus be fixed in particular without tools and / or without further fixing means on the autonomous lawnmower 10 or on the service robot. Alternative fixing or connecting means are also conceivable. A width 122 of the bumper is, for example, 375 mm. A depth 124 of the bumper is, for example, 130 mm. A height of the bumper is, for example, 40 mm. A width to depth ratio is in particular 2-4, here approximately 3. An angle 135 between the first main wall 14 and the wall section 22 of the support wall 18 connected thereto is approximately 30-45°, in particular approximately 37.5°. An angle 136 between the second main wall 16 and the wall section 24 of the supporting wall 18 connected thereto is approximately 30-45°, in particular approximately 37.5°. The angles 135, 136 between the first and second main walls 14, 16 and the wall portions 20, 22, 24, 26 have in particular the same size.

Claims

Bumper (12) for an autonomous lawnmower (10) or service robot, in particular lawn mower robot bumper, having a first and a second main wall (14, 16) spaced apart from one another and a plurality of supporting walls (18, 20) connecting the first and the second main wall (14, 16), characterized in that the plurality of supporting walls (18, 20) each have two non-intersecting wall portions (22, 24, 26, 28) aligned at an angle, in particular at an angle of isosceles, with respect to one another.Bumper (12), at least according to the preamble of claim 1, in particular according to claim 1, characterised in that the bumper (12) has a mirror symmetry plane (30), in particular has a mirror symmetry plane (30) which is defined vertically front-back centrally by the bumper (12), and supporting walls (18, 20) are arranged in pairs mirror-symmetrically with respect to the mirror symmetry plane (30), in particular are formed so as to project in opposite directions.Bumper (12) at least according to the preamble of claim 1, in particular according to one of the preceding claims, characterized in that the plurality of supporting walls (18, 20) are each formed by two chevron-shaped and / or acute-angle wall portions (22, 24, 26, 28) aligned with respect to one another, in particular isosceles wall portions (22, 24, 26, 28) aligned acute-angle with respect to one another are formed, preferably wherein one half of the plurality of supporting walls (18, 20) is formed in an opposite chevron-shaped and / or acute-angle manner with respect to the other half of the plurality of supporting walls, in particular on opposite sides of a central mirror symmetry plane (30), preferably wherein supporting walls (20, 22) are formed in a parallel offset manner with respect to adjacent supporting walls (20, 22), in particular wherein adjacent supporting walls (20, 22) do not touch one another and / or impede one another in the compression in the case of in particular complete compression of the bumper (12).Bumper (12) according to one of the preceding claims, characterized in that the bumper (12) has a mirror symmetry plane (30) in the middle, wherein a supporting wall (18) of the plurality of supporting walls (18, 20), with respect to the mirror symmetry plane (30), is formed mirror-symmetrically with respect to the supporting wall (20) of the supporting walls (18, 20) opposite it, in particular wherein wall portions of the supporting walls have opposite opening angles, in particular isosceles wall portions have opposite opening angles (32, 34), preferably wherein the mirror symmetry plane (30) is not cut by any supporting wall (18, 20), in particular also not cut in the compressed state of the bumper (12).Bumper (12) according to one of the preceding claims, characterized in that an angle (32, 34) of the wall sections (22, 24, 26, 28) oriented in chevron-shaped and / or acute-angled manner with respect to one another is 45° to 85°, in particular an angle (32, 34) of 75° or 67.5°.Bumper (12) according to one of the preceding claims, characterized in that a length (36) of the wall sections (22, 24, 26, 28), in particular in a sectional plane parallel to a horizontal plane (62), is smaller than or equal to the distance (38), in particular transverse distance, of a supporting wall (20) from the next supporting wall (20), in particular a length (36) of the wall sections (22, 24, 26, 28) corresponds substantially to the distance (38) of adjacent supporting walls (20) aligned parallel to one another.Bumper (12) according to one of the preceding claims, characterized in that the main walls (14, 16) have a different height (48, 50), in particular in the vertical direction (82), in particular wherein a ceiling wall (52) connects the spaced main walls (14, 16) in an inclined roof-like manner, preferably connects them at an angle (54) of 30-60°, in particular 50°, preferably falling down on the front side, in particular wherein the support walls (18, 20) are connected to the two main walls (14, 16) and the ceiling wall (52) connecting them obliquely in a preferably materially bonded manner.Bumper (12) according to one of the preceding claims, characterized in that the two main walls (14, 16) have a distance (72) from one another which is greater than the distance (38) between adjacent supporting walls (18, 20), in particular in the transverse axis direction, in particular less than 50% greater, preferably about 20-30% greater, in particular about 25% greater, and / or in that one main wall (14, 16) is about 50-150%, in particular about 50-100% thicker than one supporting wall (18, 20).Bumper (12) according to one of the preceding claims, characterized in that the bumper (12) can be connected to the chassis (64) or to a housing (66), in particular cover housing, of the autonomous lawnmower (10) via latching elements (58), in particular having a main direction of extension (60) substantially parallel to a horizontal plane (62); and / or in that the bumper (12) has positive-locking elements (68) for the sliding connection to the chassis (64), preferably having a main direction of extension (70) perpendicular to the horizontal plane (62), in particular having a T-shaped cross section, preferably arranged on the rear side of the rear-side main wall (16).Bumper (12) according to one of the preceding claims, characterized in that the bumper (12) is formed in one piece and / or is formed from a preferably dimensionally elastic material, in particular plastic, preferably polyurethane, and / or in that the bumper (12) is formed closed on three sides, in particular on the front, rear and upper sides (40, 42, 44), and open on an underside (46).Bumper (12) according to one of the preceding claims, characterized in that a rear side (42) of the bumper (12), in particular a rear-side main wall (16), is provided to bear directly, preferably in a planar manner, against a chassis (64) and / or against a housing (66) of the autonomous lawnmower (10) or service robot.Autonomous lawnmower (10) or service robot, having a bumper (12), in particular a lawn mower robot bumper, according to one of the preceding claims.

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