| 摘要 |
<p>1,233,453. Metal forming apparatus. WESTERN ELECTRIC CO. Inc. 8 July, 1968 [10 July, 1967], No. 32420/68. Heading B3H. A pressure vessel stated as being used in the metal forming art comprises an inner high pressure chamber 130 whose walls 124 are surrounded by an outer fluid chamber 136 supplied with pressurized fluid through a passageway 152 in the walls of the inner chamber. The chambers are defined by a pair of coaxial cylinders closed by end caps 126, 127. The inner chamber is pressurized as high as 250,000 p.s.i. either through a passage 141 in one end cap or by inwardly movable pistons 343, 344. In the latter case the outlet from the passageway 152 is positioned centrally of the walls to apply an inward pressure at this position and prevent bowing of the walls. The pipe 150 to the passageway 152 is spaced from the end cap to prevent stress transmission to the outer walls 122. The pistons are each moved by fluid motors (261), (262), Fig. 5 (not shown), driven by fluid from a pressure source which is also supplied to a proportioning valve (265) which supplies fluid directly or through an intensifier (267) to the outer support chamber. The inner chamber walls may be made up of segments with inner and outer sleeves (414), (416), Fig. 6 (not shown).</p> |
