Cable retention device for use with a cable handling chain

Abstract: A cable handling chain link (10) including an open sided cable compartment defined between an upper wall (12), a lower wall (14) and a partition (15) extending between the upper and lower walls, the partition being located in board from the side edges of the upper and lower walls which side edges define the open side of the compartment, and a cable retention device (30) releasably connectable to the chain link, the cable retention device (30) being a unitary member of generally elongate form having an abutment face (34) which abuts against the inside face of one of said walls, and having a resilient tongue formation (36) which co-operates with said inside face and a reaction means (16) formed on the chain link to resiliently urge said abutment face into contact with said inside face, detent means (40) on said abutment face and/or said tongue for co-operation with the chain link to restrain longitudinal withdrawal of the retention device and a lateral projection (50) extending laterally away from said abutment face toward the opposite wall, said lateral projection acting to retain cables within said compartment.

Description: The present invention relates to a cable retention device for use with a cable handling chain and to the cable handling chain including such a retention device. In our UK patent 2076107 B we describe a cable handling chain which is assembled from chain links. The retention device of the present invention is primarily intended for use with the chain link constructed predominantly from a plastics material described in UK patent 2076107 and so reference should be made thereto for a detailed description and understanding of the chain link. According to one aspect of the present invention there is provided a cable handling chain link assembly comprising: a chain link; and a releasably connectable cable assembly retention device; the link having an open sided cable compartment defined between an upper wall, a lower wall, and a partition extending between the upper and lower walls; the partition being located inboard from side edges of the upper and lower walls, the side edges defining the open side of the compartment (18); the partition including an aperture adjacent to an inside face of one of said walls through which the cable retention device extends; characterised in that the cable retention device is a unitary member of generally elongate form having a main body from which longitudinally extends a resilient tongue formation; the main body having an abutment face which abuts against said inside face of one of said walls; the resilient tongue formation co-operating with said inside face and a wall of said aperture opposed to said inside face to resiliently urge said abutment face into contact with said inside face; detent means on at least one of said abutment face and said tongue for co-operation with the chain link to restrain withdrawal of the retention device in a longitudinal direction of the reaction device; and a lateral projection extending laterally away from said abutment face toward the wall opposite said one wall, said lateral projection acting to retain cables within said compartment. Preferably said inside face is provided with a guide channel for guiding longitudinal movement of the retention device. Preferably the partition is provided with an aperture adjacent to said inside face, the wall of the aperture opposed to said inside face defining said reaction means. According to another aspect of the invention there is provided a retention device for a cable handling chain link, the retention device being an elongate unitary member formed from a suitable plastics material. Various aspects of the present invention are hereinafter described with reference to the accompanying drawings in which:- Figure 1 is a diagramatic cross-sectional view of a chain link including a pair of cable retention devices according to one embodiment of the present invention. Figure 2 is a side view of one of the retention devices shown in Figure 1 illustrated in a relaxed condition. Figure 3 is a side view of an alternative embodiment of a retention device shown in a relaxed condition. Figure 4 is a plan view of the retention device shown in Figure 3. The chain link 10 includes an upper wall 12 and a lower wall 14. The upper and lower walls 12,14 are connected to one another and spaced apart by a partition wall 15. The partition wall 15 is located inbetween the opposed ends of the upper and lower walls such that two open sided compartments 18,20 are defined for reception of cables. In the illustrated embodiment a cable 25 is illustrated as being located in compartment 20 whereas compartment 18 is shown as being empty. The partition 15 is provided with a through bore 28 located adjacent to the upper wall and a through bore 29 located adjacent to the lower wall. A pair of retention devices 30 are shown in Figure 1, one retention device 30 being located adjacent the upper wall and the other retention device being located adjacent the lower wall. Both retention devices 30 are of the same construction and operate in the same way. Accordingly construction and function of each retention device will be described below with reference to the upper retention device 30. The retention device 30 is generally an elongate unitary member which is formed from a resilient material, preferably a suitable plastics material such as Nylon (registered trade mark). The plastics material may or wall 12. A similar channel 35 is provided on the lower wall 14. Deflection of the body can be achieved by pressing a suitable tool through the aperture 42 from the outside or inserting a suitable tool into the recess 46 and levering against the inside of the upper wall. A notch 47 may be provided so that during the levering motion, the tool also engages the notch and causes longitudinal displacement of the device 30. The tongue portion 36 acts to bias the body into contact with the upper wall by a cantilever action which is achieved by the tongue portion passing through the bore or aperture 28. The tongue portion 36 when in a relaxed state has a lateral dimension d which extends beyond the boundary of the abutment face and, in addition, has an overall width D which is greater than the spacing between the inside face of the upper wall and the opposed face 16 of the bore 28. Accordingly as the device 30 is inserted longitudinally, the tongue portion 36 is resiliently deformed as it is pushed through the bore 28 by engagement between face 16 and the inside face of the upper wall. The terminal end portion 44 of the tongue portion 36 engages the inside face of the upper wall at a location spaced laterally on the opposite side of the partition wall 15 to the body portion 32 and thereby produces a downwardly directed force urging the device to pivot about face 16. The face 16 thereby acts as a reaction means against which the device can co-operate to urge the abutment face 34 into contact with the inside face of the upper wall. The reaction means is conveniently formed by the face 16 which is part of the partition wall but it will be appreciated that the reaction means could be defined by a member which is not part of the partition wall. The body portion 32 is provided with a lateral projection 50 which extends toward the opposite wall and thereby provides a restriction to the open side of the cable compartment 20 in order to retain cable 25 within the compartment. In Figure 1, two retention devices 30 are illustrated. It is envisaged that a single device 30 need only be necessary per chain link, particularly if the length of the lateral projection 50 is extended. An alternative retention device 130 is illustrated in Figures 3 and 4. The retention device 130 is similar to the retention device 30 and similar parts have been designated by the same reference numerals. In the retention device 130 the detent formation 40 is formed on the terminal end of tongue portion 36, the tongue portion 36 being longer for retention device 130 to enable the detent formation 40 to engage in the aperture 42 formed in the wall 12, 14 on the side of the partition wall 15 opposite to that where the body portion 32 is located. As seen in Figure 4, the body portion 32 is provided with a pair of laterally extending support arms 80. Arms 80 have raised wall portions 81 having upper sides which act as deflecting guides for reducing the likelihood of snagging with external objects during haulage of the chain. It will be appreciated that of desired detent formation 40 may be provided on both the abutment face 34 and the tongue portion 36.

Claims: A cable handling chain link assembly (10) comprising: a chain link (10); and a releasably connectable cable assembly retention device (30); the link having an open sided cable compartment (18) defined between an upper wall (12), a lower wall (14), and a partition (15) extending between the upper and lower walls (12, 14); the partition (15) being located inboard from side edges of the upper and lower walls, the side edges defining the open side of the compartment (18); the partition including an aperture (29) adjacent to an inside face of one of said walls through which the cable retention device (30) extends; characterised in that the cable retention device is a unitary member of generally elongate form having a main body from which longitudinally extends a resilient tongue formation (36); the main body having an abutment face (34) which abuts against said inside face of one of said walls (12, 14); the resilient tongue formation (36) co-operating with said inside face and a wall of said aperture opposed to said inside face to resiliently urge said abutment face into contact with said inside face; detent means on at least one of said abutment face (34) and said tongue (36) for co-operation with the chain link (10) to restrain withdrawal of the retention device in a longitudinal direction of the reaction device; and a lateral projection (50) extending laterally away from said abutment face (34) toward the wall opposite said one wall, said lateral projection (50) acting to retain cables within said compartment (18). A chain link assembly according to claim 1 wherein said inside face is provided with a guide channel for guiding longitudinal movement of the retention device. A chain link assembly according to claim 1 or 2, wherein the detent means comprises a projection projecting from said abutment face to be located in an aperture formed in said inside face. A chain link assembly according to claim 3 wherein a recess is provided adjacent the projection to enable a tool to be inserted between the retention device and said inside face for causing deflection of the retention device and thereby cause withdrawal of said projection from said aperture. A chain link assembly according to claim 4 wherein a notch is provided in the retention device adjacent to said recess, the notch co-operating with said tool to cause longitudinal displacement of the retention device. A chain link assembly according to claim 1, 2 or 5, wherein the detent means is located on the terminal end of the tongue formation and is located in an aperture formed in said inside face. A chain link assembly according to any preceding claim, wherein the lateral projection also extends laterally in opposite directions from both sides of the retention device, the upper sides of the lateral projection defining deflection guides for reducing snagging.

Inventors: HART ANTHONY JOHN, HART, ANTHONY JOHN
Applicants: MANSIGN ENG, MANSIGN ENGINEERING LIMITED
Application year: 1990
Main classification: F16G13
IPC codes: F16G13, F16L3