Hawke Cable Glands Limited

Michael Twist

Alan Platt

Paul Mundy

The invention concerns a lead-through transit for cables 3 or pipes of the kind having a frame 1 of the opening 2 is filled by a series of modular resilient lead-through blocks 4 and blank blocks 5 arranged in rows separated by stayplates 6 with a compression and packer assembly 7 clamping and holding the blocks 4,5 and cables 3 in sealed engagement. The lead-through blocks 4 comprise two complementary half-blocks 40 that provide, when assembled together around a cable, a passageway 41 for the cable. Each half-block 40 has a series of axially spaced semi-annular lands 42 separated by recesses 43. The lands 42 provide axially spaced sealing faces for engagement with the cable while the recesses 43 enable resilient deformation of the block to accommodate variations in cable size. To assist in such resilient conformation of the half-blocks 40, it is preferred that the half-block has recesses 44 formed on the outer faces that are aligned with the lands 42. Various arrangements of the lands 42 and recesses 43 or 44 in the resilient conformable lead-through blocks are described to provide the advantage of reducing the numbers of blocks required for service and installation requirements.

Transit for cables and pipes

In a lead-through transit for cables or pipes 3 of the kind in which a series of modular resilient blocks 4 or blanks 5 are mounted in a frame 1 through which the cables 3 extend, the invention is directed to the compression and packer assembly 7 by which the opening through the frame 1 is closed and pressure applied to the assembled cables 3, blocks 4 and blanks 5 with stayplates 6 between each row of blocks. The compression and packer assembly 7 comprises a rigid plate 8 which seats on the assembled blocks 4 and blanks 5 for engagement by a compression bolt 33 mounted on the frame 1 to apply a load to the plate 8. Three resilient packer blocks 9,10 and 11 are arranged to be inserted between the plate 8 and frame 1 with two of the blocks 9,11 being for insertion on either side of the bolt 33 and having respective distance members as rods 28 to limit the reactive effect of the assembled blocks 4 and blanks 5 with cables 3 so that the compression bolt 33 can be displaced clear of the center of the frame 1 to leave a clearance spaced into which the center packer block 10 is inserted. Each packer block 9,10 and 11 has an associated compressor stud 12,13 and 14 which acts to compress it's block thereby expanding the packer blocks into tight sealing engagement between and with the plate 8 and the frame 1. The arrangement of the compression and packer assembly ensures improved sealing of the transit and is simpler to handle and assemble than prior arrangements.

A releasable tube coupling comprises a body providing a housing in which an annular seal and clamping ring are located and secured by a retainer and, a releaser slidably supported by the retainer for limited axial movement relative to the housing. The seal is of generally Z-section having outer and inner flanges connected by an inclined web convergent towards the inside of the housing. The clamping ring is mounted into the seal and has a plurality of spaced apart radially inwardly directed inclined teeth which overlie the web on the inner face of the seal for engagement with the outer surface of a tube received within the housing to retain the tube in the housing. The teeth are displaced away from the tube to permit axial withdrawal the tube on inwards movement of the releaser which acts on the teeth through the seal web.

Growing community of inventors

Manchester, United Kingdom

Michael Twist