MULTIDIRECTIONAL WHEEL AND METHOD FOR MANUFACTURE OF SAME

Abstract

The present invention relates to a multidirectional wheel, wherein the wheel has a wheel body rotatable about a wheel axle and having two half-shells and has a plurality of rotating bodies which are located at the outer periphery of the wheel body and via which the wheel can roll off, wherein at least one half-shell, and preferably both half-shells, has/have mounts in which end regions of the axles of the rotating bodies are received or which project into end regions of the axles of the rotating bodies, wherein the mounts of the half-shells are configured as continuously converging.

Claims

1. A multidirectional wheel, wherein the wheel has a wheel body rotatable about a wheel axle and having two half-shells and has a plurality of rotating bodies which are located at the outer periphery of the wheel body and via which the wheel can roll off, characterized in that at least one half-shell, and preferably both half-shells, has/have mounts in which end regions of the axles of the rotating bodies are received or which project into end regions of the axles of the rotating bodies, wherein the mounts of the half-shells are configured as continuously converging.

2. A multidirectional wheel, wherein the wheel has a wheel body rotatable about a wheel axle and having two half-shells as well as a plurality of rotating bodies which are located at the outer periphery of the wheel body and via which the wheel can roll off, characterized in that the rotating bodies have an axle which comprises at least two axial sections between which at least one spring element is arranged which exerts a force acting in the direction of the end regions of the axle onto the axial sections; or in that the axles of the rotating bodies cooperate with mounts of the half-shells, with the mounts being spring-loaded such that they exert a force acting in the direction of the axle of the rotating body arranged in the mount.

3. A multidirectional wheel in accordance with claim 1, characterized in that the rotating bodies have an axle which comprises at least two axial sections between which at least one spring element is arranged which exerts a force acting in the direction of the end regions of the axle onto the axial sections; or in that the axles of the rotating bodies cooperate with mounts of the half-shells, with the mounts being spring-loaded such that they exert a force acting in the direction of the axle of the rotating body arranged in the mount.

4. A multidirectional wheel in accordance with claim 1, characterized in that the at least one mount of one or both half-shells are integral components of the half-shells.

5. A multidirectional wheel in accordance with claim 1, characterized in that the mounts of both half-shells are arranged offset from one another in the peripheral direction of the wheel such that the longitudinal axes of the rotating bodies extend obliquely to the wheel axle of the wheel body.

6. A multidirectional wheel in accordance with claim 1, characterized in that the mounts of at least one half-shell, preferably of both half-shells, are formed as conical.

7. A multidirectional wheel in accordance with claim 1, characterized in that one or both half-shells are formed as injection molded parts; and/or in that a half-shell or a ring section or a ring segment of a half-shell is formed in one piece, with the half-shell or the ring section or the ring segment comprising at least two mounts.

8. A multidirectional wheel in accordance with claim 1, characterized in that the axle is arranged in a bearing sleeve.

9. A multidirectional wheel in accordance with claim 8, characterized in that the bearing sleeve is surrounded by a liner which forms the running surface of the rotating body, with provision preferably being made that the liner is an elastomer.

10. A multidirectional wheel in accordance with claim 9, characterized in that the liner is sprayed onto the bearing sleeve.

11. A multidirectional wheel in accordance with claim 2, characterized in that the spring element is configured as a spring or as an elastomer part, in particular as an elastomer sphere.

12. A medical device, in particular a dialysis device, having at least one multidirectional wheel in accordance with claim 1.

13. A method of manufacturing a multidirectional wheel, in particular a multidirectional wheel in accordance with claim 1, characterized in that the method comprises the steps of inserting the rotating bodies into the mounts of the half-shells and the step of the subsequent or simultaneously occurring rotation of the half-shells relative to one another.

14. A method in accordance with claim 13, characterized in that a screw connection or another fixing of the half-shells to one another takes place after the step of rotating the half-shells relative to one another.

15. A method in accordance with claim 12, characterized in that the method comprises the step of manufacturing the half-shells by injection molding, with provision preferably being made that the method comprises the step of removing the half-shell from the injection molding tool without the aid of an ejector and/or by a rotational movement.

Description

[0047] Further details and advantages of the invention will be explained in more detail with reference to an embodiment shown in the drawing. There are shown:

[0048] FIG. 1: a cross-sectional view through a multidirectional wheel in accordance with the present invention;

[0049] FIG. 2: a perspective view of the multidirectional wheel in accordance with the present invention after the assembly; and

[0050] FIG. 3: a perspective view of the multidirectional wheel in accordance with the present invention before the assembly.

[0051] FIG. 1 shows by reference numerals 10, 20 two half-shells of a multidirectional wheel arranged in parallel with one another. A plurality of rotating bodies 100, which are configured as rollers designed with a convex surface, extend between these half-shells in the peripheral region thereof.

[0052] The rollers are preferably formed with a curved, convex surface, e.g. as ellipsoid. The surface curvature can correspond to that of a toroid.

[0053] The rollers 100 comprise an elastomer region 102 which forms the running surface of the rollers. This elastomer region 102 is manufactured by insert molding of a sleeve 104.

[0054] There are two mutually spaced apart axial sections 160 in the interior of the sleeve 104 whose end regions are received in mounts 12, 22 of the half-shells 10, 20.

[0055] As can further be seen from the Figure, an elastomer sphere 108 is located between the axial sections 106 which presses apart the two axial sections 106 or exerts a force on them which acts in each case in the direction of the end section of the axles located in the mounts 12, 22.

[0056] As can be seen from FIG. 1, the diameter of the continuously converging mounts 12, 22 increases from the base region B of the mounts toward the actual rotating body 100, which brings about the advantage that the half-shells 10, 20 can be manufactured in a single-stage injection molding process, and indeed without ejector assistance. A release of the half-shells from the injection molding tool can take place, for example, by a rotary movement.

[0057] In the embodiment in accordance with FIG. 1, each mount has two conical sections of different inclination.

[0058] The further manufacture of the multidirectional wheels in accordance with the invention takes place in that the two half-shells 10, 20 are first arranged in a first rotation position relative to one another, the rotating bodies 100 are then inserted or are positioned relative to the half-shells and in that then a relative movement or a relative rotation as well as a movement of the two half-shells 10, 20 toward one another is carried out such that the rotating bodies 100 are reliably received between the two half-shells 10, 20, such as can be seen from the Figure.

[0059] The fact that the two axial sections 106 are spring-loaded brings about the above-named advantage that any production tolerances of the half-shells 10, 20 or of the mounts 12, 22 play a subordinate role and a reliable fixing of the rotating bodies 100 takes place despite such production tolerances.

[0060] FIG. 2 shows the wheel in accordance with the invention in a perspective view and illustrates that the longitudinal axes L1 of the rotating bodies 100 do not extend in parallel with the longitudinal axes L2 of the wheel, but obliquely thereto.

[0061] The same reference numerals are used in FIGS. 2 and 3 for the same elements as in FIG. 1.

[0062] The rotating bodies have a base body which forms the running surface of the rotating bodies and one or more axles or axial sections which are arranged at or in the base body.

[0063] As can be seen from FIGS. 2 and 3, the axial sections 106 are configured with end pieces 106 which adjoin the end faces of the base bodies of the rotating bodies 100 such that a stepless transition is present at the surface between the base body and the sections 106. In contrast to this, the axial sections 106 and their end regions are located in accordance with FIG. 1 not at a section set at the end faces of the base bodies of the rotating bodies, but rather have a smaller diameter than the base bodies. The axial sections 106 extend in accordance with FIG. 1 in the interior of the rotating bodies, their ends, which are received in the mounts 12, 22, project beyond the end faces of the base bodies of the rotating bodies.

[0064] FIG. 3 is a representation of the wheel in accordance with FIG. 2 before the assembly of the half-shells 10, 20. The rotating bodies 100 are first positioned relative to the mounts 12, 22 such that they are received in the mounts 12, 22 after a rotational movement of the half-shells 10, 20 relative to one another and after a translatory movement of the half-shells 10, 20 toward one another, as is shown in FIG. 2.

[0065] As can be seen from FIG. 3, the mounts 12, 22 of the two half-shells 10, 20 are arranged offset from one another in the peripheral direction.

[0066] The longitudinal axes of the mounts do not extend in parallel with the longitudinal axis L2 of the wheel, but rather extend obliquely thereto so that the oblique position of the rotating bodies results in the mounted state such as can be seen from FIG. 2.

[0067] Subsequent to the named rotation of the half-shells relative to one another, a screw connection of the two half-shells takes places so that the multidirectional wheel is completed.