AU770754B2 - Chain for carrying hose or cable - Google Patents

Description

WO 01/29448 PCT/AU00/01257 Chain for Carrying Hose or Cable FIELD OF THE INVENTION The following invention relates to a chain for carrying hose or cable, typically in an underground mine. The cable might be an electrical cable, whereas the hose might be a flexible hydraulic or pneumatic hose. The cable and/or hose pass through a length of articulated chain links. At least a portion of the chain generally resides within an open-topped channel restricting side access to the chain links.

Some known handling chains have open sides providing access to the cable or hose for maintenance and other purposes.

Other known chains comprise linkages having both top and bottom walls and a pair of opposed side walls which laterally define an enclosed cavity through which the cables or hoses pass. One such known system is disclosed in Australian patent application No. 92344/98 which discloses a chain comprising individual links having removable side walls.

In a relatively narrow open-topped channel within which the chains often reside, there is little access to the side walls to remove the same. It is therefore common practice to lift the chain from the channel to gain access to the side walls. It would be far more appropriate to remove a top wall and/or bottom wall to gain access to the interior of the individual chain links. It would also be desirable to provide a chain link structure wherein the top wall is removable in a substantially vertical direction (in a direction away from the bottom of the open-topped channel upon which the chain is supported).

This is unlike the conventional side-removal/insertion technique for cables or hoses that is known and for which the chain of Australian patent application No. 93244/98 is designed.

WO 01/29448 PCT/AU00/01257 2 OBJECT OF THE INVENTION It is the object of the present invention to overcome or substantially ameliorate the above disadvantage and/or more generally to provide an improved chain for carrying hose or cable.

DISCLOSURE OF THE INVENTION There is disclosed herein a link for a chain for carrying hose or cable, comprising: a top wall, a bottom wall, a pair of side walls fixed to respective opposed lateral ends of the top and bottom walls to define a cable/hose receiving passage bound by all four walls, each side wall having a pair of pivot connectors at respective longitudinal ends thereof for articulated interconnection of the link with an adjoining link of the chain, wherein the top and/or bottom walls can be detached from the side walls in a direction away from each other to provide access to said cable/hose receiving passage.

Preferably the top and bottom walls are identical.

Preferably the side walls are identical.

Preferably each side wall includes an internally located, longitudinally extending reinforcing member at respective longitudinally opposed ends of which said pivot connectors are provided.

Preferably the top and bottom walls each comprise a pair of curved comer features to provide a smooth transition to an inner surface of the respective side walls.

Preferably said bottom and top walls are attached to the respective side walls by dovetail interconnection means.

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WO 01/29448 PCT/AU00/01257 3 Preferably the top and bottom walls are secured to their respective side walls by means of a pivotable key member.

Preferably each chain link comprises a pair of said key members.

Preferably each key member passes vertically through a side wall and the respective dovetail interconnection between that side wall and each of the top and bottom walls.

Preferably each said longitudinally extending reinforcing member comprises a pair of sub-members in back-to-back configuration, a first portion of the reinforcing member having said sub-members engaging each other and a second portion having the submembers spaced apart and parallel.

Preferably the pivotable key member passes between the spaced apart portions of the reinforcing member sub-members.

Preferably each pivotable key member has an exposed end associated with a recess in the respective top or bottom wall.

Preferably the exposed portions of the key members each include a bent-over portion extending substantially normally from the main longitudinal extent of the key member.

Preferably useable with the pivotable key members is a locking tool adapted to fit over the bent-over portions of the respective key members so as to reorientate the key members into one of several orientations, a first of which releases the top wall and bottom wall from the respective side wall, a second of which locks the top and bottom walls to the respective side wall, and a third of which locks one of the top or bottom wall and unlocks the other of the bottom or top wall from the respective side wall.

As an alternative to the provision of a locking key member, a bolt and nut arrangement for example might be provided.

WO 01/29448 PCT/AU00/01257 4 BRIEF DESCRIPTION OF THE DRAWINGS A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings wherein: Figure 1 is a schematic perspective view of three links of a chain for carrying hose or cable; Figure 2 is a schematic plan view of a top wall of a chain link; Figure 3 is a schematic detailed plan view of the portion indicated by III in Figure 2; Figure 4 is a schematic elevational view of a bottom wall; Figure 4B is a schematic cross-sectional elevational view taken at B-B in Figure 4; Figure 5 is a schematic elevational view of a side wall; Figure 6 is a schematic plan view of the side wall of Figure Figure 7 is a schematic cross-sectional elevational view taken at VII-VII of Figure 6; Figure 8 is a schematic elevational view of a sub-member, two of which form a reinforcing member; Figure 9 is a schematic plan view of the sub-member of Figure 8; Figure 10 is a schematic perspective view of a tool useable with a locking key to lock and/or unlock the top and/or bottom walls from the side walls of the chain links; Figure 11 is a schematic rear elevational of the tool of Figure Figure 12 is a schematic inverted plan view of the tool of Figure Figure 13 is a schematic elevational view of the tool of Figure Figure 14 is a schematic front elevational view of the tool of Figure Figure 15 is a schematic cross-sectional elevational view taken at XV-XV in Figure 14; and Figure 16 is a schematic perspective view of a chain link.

WO 01/29448 PCT/AU00/01257 DESCRIPTION OF THE PREFERRED EMBODIMENT In the accompanying drawing there is schematically depicted the components of an individual chain link 10. Three such chain links 10 are shown interconnected to form a segment of a chain in Figure 1.

Each link 10 comprises a top wall 11, a bottom wall 12 and a pair of laterally opposed side walls 13 and 14. These components are typically fabricated from high strength, abrasive-resistant plastics material or metal. The top wall 11, bottom wall 12 and side walls 13, 14 interconnect to form a cable/hose receiving passage 29. The chain typically sits and/or rides along an open-topped channel. That is, access to the chain is generally from above.

In Figure 2 the top wall 11 is shown. The top wall includes a pair of laterally opposed dovetail connectors 18 into the upper surface of which there is provided a recess 15. A key member 16 having upper and lower bent-over portions fits within the respective side walls such that the bent-over portions reside within the respective recess 15. The association of the recess 15 with the key member 16 is best depicted in Figure 16.

Each recess 15 includes a through-slot 35 through which the bent-over portion of the key member 16 might pass if the key member were appropriately orientated. For the sake of simplicity of description, reference is now made to the bent-over portion 16 of the key member indicated by the word "KEY" in Figure 16. At this position, should the leg of key 16 be oriented in the direction indicated by arrow B, both the upper and lower walls of the chain link will be secured to the side wall 13. If the bent-over portion of the key 16 faces in the direction indicated by arrow A (ie. as depicted), then the top wall 11 is free to lift off the side wall 13 whereas the bottom wall 12 is fixed.

That is, the bent-over portion 16 will pass through the through-slot 35 provided beneath the recess 15 of the top wall 11. The lower bent-over portion of the key is angled away from the slot 35 at the bottom wall and therefore the bottom wall is retained. With the bent-over portion facing the direction indicated by arrow C, the to wall 11 will be retained, whereas the bottom wall 12 is capable of being detached from the side wall 13. In order to maintain a firm interengagement of the top wall and WO 01/29448 PCT/AU00/01257 6 bottom wall with the respective side wall, the length of the key member should be such as to ensure tight engagement of the bent-over portion with the bottom of the respective recesses.

In the fixed, in use configuration wherein all walls are securely attached, the bent-over portions of one key will face laterally the link to the bent-over portions of the other key.

In Figure 4, the bottom wall 12 is shown to have on its upper (inwardly facing) surface a pair of opposed curved corner features 19 providing a smooth transition to the internal surface of the respective side walls 13, 14 once assembled.

Each of the recesses 15 has extending downwardly therefrom a hole 17 through which the substantially cylindrical shaft portion of the respective key member passes.

In Figure 5 one of the side walls 13, 14 is depicted.

Each side wall 13, 14 includes an upper and lower dovetail recess 24 into which the protruding dovetails 18 of the respective top and bottom walls can be received.

Moulded within the side walls 13, 14 is a reinforcing member 20, one end of which is exposed from the side wall to present a pivot hole 21. At the other end of the reinforcing member 20 there is provide another pivot hole 22 coinciding with a hole passing through the side wall. This end portion of the reinforcing member 20 does not extend beyond the structure of the side wall. In use, when the chain links are articulated, the hole 21 of one reinforcing member 20 is aligned with hole 22 in another and a short pivot pin or shaft extends therethrough.

To limit the degree of pivotal articulation between adjoining chain links, a pair of buffer surfaces 23 are provide against which the corresponding buffer surfaces 35 of an adjoining link can abut.

WO 01/29448 PCT/AU00101257 7 As shown in Figure 6, a reinforcing member comprises a pair of back-to-back submembers, one of which is shown in Figures 8 and 9. The sub-members for the sake of convenient description can be separated into two portions 26 and 27. Portions 26 are spaced apart by a space 25 to receive the engaging portions 27 of a reinforcing member of the adjoining chain link. The engaging portions 27 extend out of the end of the side wall as shown in Figure 5, whereas the spaced apart portions 26 do not protrude. Portions 26 and 27 are delimited by a deflection 28 shown in Figure 9.

In Figure 6, the straight shaft portion of the key member 16 is shown positioned between the spaced apart portions 26 alongside the respective deflections 28.

Figures 10 to 15 depict a tool 30 used to rotate the pivotable key member 16. The tool includes a square recess 31 to receive the protrusion of a socket tool and a transversely extending aperture 34 which might alternatively be engaged by the shaft of a screwdriver for example. Protruding from the other end of the tool 30 is a Ushaped engaging element 32 having a recess 33 therein sized and shaped to receive the bent-over leg portion of the key member 16 shown in Figure 3. The key member can pivot throughout 3600 and be provided with recesses or protrusions which interengage with the dovetail protrusions of the top and bottom walls to selectively lock and unlock the top and bottom walls from the side walls.

The design of the dovetail interconnection is such as to allow only vertical removal of the top and/or bottom walls so as to gain access to the passage 29. Depending on the orientation of the key member 16, the top and bottom walls might be locked to the side walls, both the top and bottom walls might be unlocked from the side walls, or one or the other of the top and bottom walls might be locked (with the other unlocked) from the respective side wall. A simple turn of the key member 16 to a particular angular orientation will allow the desired disassembly of the components.

As the chain generally resides in use within an open-topped channel, the most convenient means of access to the passage 29 is by removal of the top wall 11. This WO 01/29448 PCT/AU00/01257 8 contrasts favourably with other known systems where the chains links must be lifted sideways to gain access to a side wall.

It should be appreciated that modifications and alterations obvious to those skilled in the art are not to be considered as beyond the scope of the present invention. For example, rather than providing the dovetail interengagement feature, a number of vertical dowels might be provided. Furthermore, rather than providing the pivotable key member, nuts and bolts could be provided.

Claims (16)

1. A link for a chain for carrying hose or cable, comprising: a top wall, a bottom wall, a pair of side walls fixed to respective opposed lateral ends of the top and bottom walls to define a cable/hose receiving passage bound by all four walls, each side wall having a pair of pivot connectors at respective longitudinal ends thereof for articulated interconnection of the link with an adjoining link of the chain, wherein the top and/or bottom walls can be detached from the side walls in a direction away from each other to provide access to said cable/hose receiving passage, and wherein the top and bottom walls are secured to their respective side walls by means of a pivotable key member.

2. The link of claim 1 wherein the top and bottom walls are identical.

3. The link of claim 1 or claim 2 wherein the side walls are identical.

4. The link of claim 1 wherein each side wall includes an internally located, longitudinally extending reinforcing member at respective longitudinally opposed ends of which said pivot connectors are provided.

The link of claim 1 wherein the top and bottom walls each comprise a pair of curved corner features to provide a smooth transition to an inner surface of the respective side walls.

6. The link of claim 1 wherein said bottom and top walls are attached to the respective side walls by dovetail interconnection means.

7. The link of claim 1 wherein each chain link comprises a pair of said key members. AMED SEi (ARICLE 19)

8. The link of claim 7 wherein each key member passes vertically through a side wall and the respective dovetail interconnection between that side wall and each of the top and bottom walls.

9. The link of claim 4 wherein each said longitudinally extending reinforcing member comprises a pair of sub-members in back-to-back configuration, a first portion of the reinforcing member having said sub-members engaging each other and a second portion having the sub-members spaced apart and parallel.

10. The link of claim 9 wherein the top and bottom walls are secured to their respective side walls by means of a pivotable key member passing between the spaced apart portions of the reinforcing member sub-members.

11. The link of claim 7 wherein each pivotable key member has an exposed end associated with a recess in the respective top or bottom wall.

12. The link of claim 11 wherein the exposed portions of the key members each include a bent-over portion extending substantially normally from the main longitudinal extent of the key member.

13. The link of claim 12 and a locking tool adapted to fit over the bent-over portion of the respective key members so as to reorientate the key members into one *of several orientations, a first of which releases the top wall and bottom wall from the *respective side wall, a second of which locks the top and bottom walls to the respective side wall, and a third of which locks one of the top or bottom wall and unlocks the other of the bottom or top wall from the respective side wall.

14. A chain for carrying hose or cable including a plurality of links according to any preceding claim.

S* A link substantially as described herein with reference to the accompanying drawings. 11

16. A chain substantially as described herein with reference to the accompanying drawings. DATED this 17 th day of December 2003 SENIOR THERMAL ENGINEERING AUSTRALIA PTY LIMITED Patent Attorneys for the Applicant: HALFORD CO