| 摘要 |
<p>A flexible cable (1) having wire (4) helically coiled around a flexible core (2), the wire turns being engageable by a pinion for effecting longitudinal drive of the cable in a tubular guide, has a covering (10) of plastics material which is thicker over the crowns (6) of the wire turns than over the core surtaces (7) between the wire turns; such a covering can be applied to the cable by machine-extruding around the cable a sleeve of heated covering material while exerting an appropriate pneumatic pressure difference between the exterior and the interior of the sleeve.</p> |
