ROTARY CLEANING DEVICE

Abstract: A rotary cleaning element having a head (12) adapted to be mounted for rotation about a central axis, the head (12) supporting a plurality of radial arms (14) which are spaced substantially angularly equidistant around the central axis, the free ends of the arms each support a tool (15) which are rotatable about the end of the arm, the free ends of the radial arms (14) intersect a plane which is transverse to the central axis and spaced axially outwardly from the head.

Description: "Rotary Cleaning Device" THIS INVENTION relates to rotary cleaning elements. A particular application of the invention relates to rotary cleaning elements which may be used to clean non- planar surfaces such as pipes, tubing and the like. In one form the invention resides in a rotary cleaning element comprising a head adapted to be counted for rotation about a central axis, said head supporting three radial arms which are substantially angularly equidistant from each other, the free ends of the arm supporting tool bits which are rotatably mounted thereoa about a longitudinal axis thereof the free ends of said radial arms intersecting a plane spaced axially outwardly from the hub. The invention will be more fully understood in the light of the following description of one specific embodiment. The description is made with reference to the accompanying drawings of which: Figure 1 is a plan view of the embodiment; and Figure 2 is a side elevation of the embodiment. Figure 3 is a part sectional view of a second embodiment showing its mounting when in position; Figure 4 is a plan view of a third embodiment; Figure 5 is a partial view of the side elevation of the third embodiment along line 5-5 of Figure 4; Figure 6 is an underneath view of a fourth embodiment; and Figure 7 is a sectional view of the fourth embodiment along line 7-7 of Figure 6. The embodiments are directed to a cleaning element which may be used with cleaning devices of the form disclosed in International Patent Applications PCT/AU86/00314 and PCT/AU86/00123. Such cleaning elements are used to clean surfaces which are generally of a cylindrical configuration and it is necessary that the cleaning action applied to the surface by the cleaning element is maximised. The cleaning element of the first embodiment of Figures 1 and 2 comprises a substantially cylindrical hub member 11 which is to be fixed- to a drive shaft for rotation with the drive shaft. The hub member 11 supports a substantially circular head 12 through a universal joint 13 whereby the head is caused to rotate with the hub 11 but is capable of pivotal movement about a plurality of transverse axes of the hub 11. The head 12 supports three radial arms 14 which are spaced angularly equidistant around the central axis and are of a substantially equal length. The axes of the radial arms 14 angularly are offset from the transverse plane of the head 12 such that the plane intersected by the free ends of the radial arms 14 is spaced axially outwardly from the outer end of the head 12. The free end of each arm 14 supports a tool bit 15 which is freely rotatable on the radial arm about a substantially central axis of the radial arm 14. Each tool bit is of a substantially frusto conical configuration and the outer periphery of the tool bit is formed with a plurality of substantially axial ribs 16. The tool bits 15 are formed of a suitable tool grade hardened steel or like material. As a result of the configuration of the radial arms all of the tools 15 can be brought into contact with a non-planar surface with substantially equal pressure being applied to the surface through each of the tools. The function of the universal joint permits the head 12 to adopt a variety of orientations on the hub 11 to enable the tools to be applied against the surface with equal pressure. On rotation of the head 12 through hub 11 the tool bits 15 are caused to roll over the surface which together with the force being applied to the surface by the hub will cause disintegration of any foreign material on the surface of the non-planar member. As a result foreign materials can be removed from a surface with reduced abrasive action compared to conventional brushes which rely substantially on abrasion. The second, third and fourth embodiments are similar to the first embodiment and the same reference numerals have been used in Figures 3,4,5,6, and 7. Figure 3 illustrates the second embodiment in position in which a flexible cover or boot 20 covers the universal joint 13 between the hub 11 and the head 12. In addition a grease nipple 21 is provided in the head 12 which communicates via passageways 22 in the head and arms with the mountings between the amrs and tool bits for librication of the bearings therebetween. The third embodiment of Figures 4 and 5 is intneded to be fixed to a hub (not shown) to rotate therewith. No pivoted movement is provided between the head 12 and hub but if desired the hub and/or drive shaft (not shown) may be capable of some pivoted articulation. The fourth embodiment of Figures 6 and 7 is also extended to be fixed to a hub on drive shaft (not shown) without any pivoted interconnection clear therebetween. If desired the hub and/or drive shaft may be capable of some pivoted articulation. In addition a resilient buffer 23 is provided in the head 12 for engagement between the head 12 and hub 11 to absorb some axial loadings or shocks therebetween. It should be appreciated that the scope of the present invention need not be limited to the particular scope of the embodiment described above. In particular the invention need not be limited to the particular relationship between the hub 11 and head 12 or to the particular configuration of the tools 15.

Claims: THE CLAIMS defining the invention are as follows: 1. A rotary cleaning element comprising a head adapted to be mounted for rotation about a central axis said head supporting a plurality of radial arms which are spaced substantially angularly equidistant around the central axis, the free ends of the arms each support a tool which are rotatable about the end of the arm, the free ends of said radial arms intersecting a plane transverse to the central axis and spaced axially outwardly from the hub. 2. A rotary cleaning element as claimed at claim 1 comprising 3 radial arms. 3. A rotary cleaning element as claimed at claim 1 or 2 wherein the tools have a substantially frusto coaxial configuration. 4. A rotary cleaning element as claimed at any one of the preceding claims wherein the tools are formed with a plurality of axial ribs. 5. A rotary cleaning element as claimed at any one of the preceding claims wherein the head is mounted to a hub for rotation therewith and is pivotable therein about at least two perpendicular transverse axes of said hub. 6. A rotary cleaning element substantially as herein described with reference to the accompanying drawings. 7. A cleaning apparatus utilising a cleaning element of the form as claimed at any one of the preceding claims.

Inventors: FIELDER NICHOLAS ALBERT WILLIA, FIELDER, NICHOLAS, ALBERT, WILLIAM
Applicants: DAWSON OFFSHORE PTY LTD, DAWSON OFFSHORE PTY. LTD.
Application year: 1987
Main classification: B08B1
IPC codes: B08B9