Patent GB-680377-A (GB)
Title: Improvements in or relating to lathes or like machine tools
IPC: B23Q1/01
Filed: 1950-07-10
Abstract: 680,377. Lathes &c. SPRINGFIELD MACHINE TOOL CO. July 10, 1950 [July 14, 1949], No. 17192/50. Class 83 (iii). A lathe &c. for use on a supporting surface subject to shock, vibration or like movement comprises a relatively stiff bed on which work operations may be performed, a base for supporting one end of the bed, means for resiliently supporting said base above the surface to effect absorption of its movements, a leg for supporting the opposite end of the bed on the surface, and means pivotally securing the leg to the opposite end of the bed while preventing relative separation thereof to provide for movement of the bed with respect to the leg compensating for relative movement of the base and surface. The bed 20, Fig. 2, is formed from rigid side-members 30, 31, connected by welding to cross-braces 40, 41, Fig. 3, with an end-member 33 welded across the headstock ends, and the tailstock ends connected to a channel-shaped member 35 which forms a cover for the connection between the end of the bed and the supporting leg 25, Fig. 2. Separate hardened and ground steel guide-rails 44, Fig. 5, are provided for supporting the carriage and also a beam 45 for a taper attachment and the rack 46. A rectangular casing 50 supports the headstock end and driving motor which has a top cover 51 sloped towards the middle and front to carry away cutting fluid and to which the lid is bolted with the interposition of a wedge member 56, Fig. 4. The casing 50 is supported at its lower end by four plates 60, Fig. 9, in laterally spaced relation. Each plate is bolted to the deck &c. at diagonally opposite corners 61 through pads 62 welded to the plates. A diagonally-arranged bar 65 is welded to the upper surface of each plate in connecting relation with the unsupported corners of the plate. At the front and back of the casing 50 each bar 65 is welded to the lower end of a vertically-arranged channel 66 which is welded to the inner surface of casing 50 and at its upper end to the under-surface of plate 51. An angle 70 is welded along the lower edge of casing 50 at the outer and inner ends of the base and a number of spacers 71 are welded to the undersurface of these angles to rest on the adjacent upper surface of the bars 65. Pads 72 of resilient material are secured to the angle and engage the upper surface of plates 60 adjacent the bolt-holes 61. The leg 25, supporting the tailstock end of the bed, is formed of resilient sheet material in U-shape and is bolted to the deck through a spacer bar 96, Fig. 2. A gimbal mounting is provided between the upper end of the leg and the bed. A shaft 110 is journalled in the side frame members of the bed and passes through a block 105, Fig. 12, allowing for rocking of the bed about an axis parallel to the bed, and shafts 104 secured to the block 105 are journalled in blocks 101 secured to the leg allowing rocking about an axis transverse to the other axis. The driving motor 24 is suspended from a plate 80 which is hinged to the bed through lugs 83 thereon and a spindle 82. The opposite end of plate 80 is provided with lugs 85 carrying adjustable eye-bolts 87 which are brought into correspondence with holes in lugs 89 welded to the bed so that a rod 88 mav be slid through to hold the motor in its adjusted position.