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A self-propelled running apparatus for cleaning a surface immersed in a liquid, includes a tranverse running member having two ends through which it is mounted rotatable on a frame about a tranverse axis of rotation, a device for driving in rotation the member and a frame-mounted guide borne by the

A self-propelled running apparatus for cleaning a surface immersed in a liquid, includes a tranverse running member having two ends through which it is mounted rotatable on a frame about a tranverse axis of rotation, a device for driving in rotation the member and a frame-mounted guide borne by the frame. The guide is adapted to enable, without dismantling relative to the frame the frame-mounted guide and without dismantling the frame itself, at least the displacement of the running member between a working position and a maintenance position.

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1. A self-propelled running apparatus for cleaning a surface submerged in a liquid, comprising:at least one transverse running member, having two axial ends by which it is mounted rotatably on a frame around a transverse axis of rotation, and means for rotationally guiding the running member, compri

1. A self-propelled running apparatus for cleaning a surface submerged in a liquid, comprising:at least one transverse running member, having two axial ends by which it is mounted rotatably on a frame around a transverse axis of rotation, and means for rotationally guiding the running member, comprising means for driving said member in rotation via at least one of its axial ends, and of which a part at least, called the frame-mounted guide means, is carried by the frame, wherein the guide means are adapted to allow, without any demounting with respect to the frame of the frame-mounted guide means and without any demounting of the frame itself, at least the displacement of the running member between a position, called the working position, in which the running member cooperates with the guide means so as to be driven in rotation around the transverse axis, and a position, called the maintenance position, adapted to enable at least one component forming a running surface of the running member to be replaced, wherein the running member comprises two sections as an axial extension of each other when the said member is in the working position, each section having an axial end, calling the coupling end, by which, in the working position, it is connected to the other section, and an opposite axial end, called the guiding end, corresponding to an axial end of the running member, wherein the guide means comprise means, called the intermediate removable holding means, adapted to hold each section in the working position at its coupling end and to release said coupling end, in the maintenance position, in order to allow the displacement of the section, and wherein the sections are coaxial and telescopic, the intermediate removable holding means being adapted to maintain, in an anchoring position, a given spacing between the two sections corresponding to their working position, and enable, in a release position, the sections to slide in each other between their working position and their maintenance position, in which the guiding ends of the two sections are separated from the frame and from the frame-mounted guide means. 2. An apparatus as claimed in claim 1, wherein the sections have axial-abutment means at their coupling end, the abutment means of the two sections being opposite in the transverse direction, and wherein the intermediate removable holding means are adapted to be inserted, in the anchoring position, between the abutment means of the two sections.3. An apparatus as claimed in claim 2, wherein the intermediate removable holding means comprise a spacer which is located perpendicularly to the coupling ends of the sections and mounted on the frame enabling them to pivot around a transverse axis, and the dimension of which in the transverse direction corresponds to the transverse distance between the abutment means when the sections are in the working position.4. An apparatus as claimed in claim 3, wherein the intermediate removable holding means comprise a guiding half-bearing fixed on the frame perpendicularly to the spacer, the said guiding half-bearing and spacer being adapted to guide the connecting ends of the sections radially when the spacer is in the anchoring position.5. An apparatus as claimed in claim 4, wherein the guiding half-bearing and the spacer are provided with means for reversibly fixing the said spacer to the said guiding half-bearing when the spacer is in the anchoring position.6. An apparatus as claimed in claim 1, wherein the two sections have at least substantially equal lengths.7. An apparatus as claimed in claim 1, wherein the drive means comprise means for coupling an element for transmitting the movement of a driving shaft to the guiding end of at least one of the sections, a part of which, called the section-mounted coupling means, is integral with the section, and a mating part of which, called the frame-mounted coupling means, is carried by the frame, the section-mounted coupling means and the frame-mounted coupling means being adapted to cooperate by simple relative movement into place.8. An apparatus as claimed in claim 7, wherein the section-mounted coupling means comprise positive-locking means, with grooves, and wherein the frame-mounted coupling means comprise mating positive-locking means with ribs, projecting from an output journal of a lateral transmission device, the said journal being situated as an axial extension of the section.9. An apparatus as claimed in claim 7, wherein, for each running member, each of the two sections is coupled to a transmission element situated adjacent its guiding end.10. An apparatus as claimed in claim 9, which comprises two independent motors, each adapted to drive one of the sections of the running member or all of the sections located on the same side of the apparatus belonging to different running members.11. An apparatus as claimed in claim 7, wherein a first of the two sections is coupled to a transmission element situated adjacent its guiding end, and wherein the second section has a guiding end free in terms of rotation, the connecting ends of the two sections having mating coupling means adapted to enable the second section to be driven by the first.12. An apparatus as claimed in claim 1, wherein the guide means and each running member are made of rigid synthetic materials.