| 摘要 |
<p>A method and apparatus for manufacturing a stanchion or tube having at least two integral bulbous portions thereon comprising:- defining at least two spaced cavities on the outside of a stanchion tube, the inner surface of the cavities being shaped to define the outer contour of the integral bulbous portions of the completed stanchion; expanding a predetermined quantity of deformable and substantially incompressible material within the tube between the inner ends of two oppositely directed rods extending into the tube from the ends thereof, to cause the tube to deform in substantial conformity with the inner surface of the cavity; and repeating the process on any other regions having cavities deformed on the outside thereof without firstly removing the rods from the tube.</p> |
