| 摘要 |
1302672 Boring pressure vessels T D WILLIAMSON Inc 31 Aug 1971 40671/71 Heading B3C Apparatus for tapping a pressure vessel comprises a boring bar 40, Figs. 1, 3, 4, and a lead screw 15 connected to the boring bar, means 18, 45, 46, for rotating the boring bar, and means 22, 27, 28, for rotating the lead screw, the boring bar rotating means being responsive to the load imposed on the boring cutter so as to vary the relative speed of rotation of the boring bar and the feed screw, and therefore the rate of feed. Lead screw 15 has a hexagonal end 15c, Fig. 4, which extends into a matching bore in a clutch sleeve 22, the latter being moved axially along the screw against a spring 23 by an hydraulic piston 34. Sleeve 22 is keyed to a worm-wheel 27 which is rotated by an hydraulic motor 31 through gearing 30, 29 and a worm 28. A worm wheel 45 is mounted on a drive sleeve 18 and is driven by an hydraulic motor 49 via gearing 48a, 48b, Fig. 1, and a worm 46, and the drive shaft 18 is keyed to a boring bar 40, Fig. 4, which bar is in screwed engagement with lead screw 15. A flywheel 47 is carried on worm shaft 46a, Fig. 1. Relative rotation between lead screw 15 and boring bar 40 causes axial movement of the latter and such relative movement is indicated on a counter 68, Fig. 1, which is driven from a differential 60, Fig. 4, which in turn is driven through a roller chain 63 by lead screw 15, and from drive sleeve 18 through gearing 17, 65. In operation, the apparatus is mounted on a valve (43), Fig. 5 (not shown), which is opened. The cutter (41) is moved to just above the pressure vessel (42) by rotating lead screw 15. Motors 31, 49 are adjusted so that the lead screw 15 and boring bar 40 rotate at the same speed. The rotational speed of screw 15 is now reduced by actuating a valve 55, Fig. 1, until the desired feed rate is obtained. As the cutter starts to bore, its rotational speed is reduced, as also is the feed rate. After the coupon has been cut from the workpiece the boring bar is retracted, the cutter is removed, and a plug is attached to the boring bar and then screwed into the hole in the workpiece. |
| 申请人 |
T.D. WILLIAMSON INC., TULSA, OKLA., US |
发明人 |
ROSE, DILLARD LEE, CLAREMORE, OKLA., US;OSBURN, COY DE, TULSA, OKLA., US |
