Boring device for a lining material applied onto the inner...

Details Boring device for a lining material applied onto the inner... Boring device for a lining material applied onto the inner...

B - Operations, Transporting

26

F

309/6

B26F 3/08 (2006.01)

Patent

CA 1292033

S P E C I F I C A T I O N TITLE: A BORING DEVICE FOR A LINING MATERIAL APPLIED ONTO THE INNER SURFACE OF A PIPE LINE ABSTRACT OF THE DISCLOSURE A boring device for a lining material applied onto the inner surface of a pipe line which comprises a tension coil spring, a compression coil spring being connected to the tip of the tension coil spring and having a spring constant smaller than that of the tension coil spring, a head element in the form of a circular truncated cone being connected to the tip of the compression coil spring and comprised of an electric heat-generating means coated with a thermoplastic resin and a single or plural transmission wires being connected to the electric heat-generating means and being passed in loosened state through the tension coil spring and the compression coil spring, the transmission wires being fixed within the tension coil spring at plural points, and a means provided in rear of the tension coil spring for rotationally sending it out. The head elelement of the boring device can exactly be located in the branched portion of the lined pipe lins and the sending of the tension coil spring can be controlled by the device provided with an electric circuit capable of detecting a change in rotation speed, impedance and electromotive force. Since the transmission wires are loosely knitted and fixed at several points and since the individual coil springs are connected by way of a connector, the boring device can be used without any disconnection problem.

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