Patent GB-189812665-A (GB)
Title: Improvements in or relating to the Bending or Bevelling of Ships' Frames and other Articles.
Inventor: HAMPSON FRANK GEORGE
Filed: 1898-06-06
Granted: 1899-06-02
Abstract: 12,665. Hampson, F. G. June 6. Bending.-Relates to an arrangement for use with machines such as are described in Specifications Nos. 12,256 and 19,623, A.D. 1896, for the bending or bevelling of ships' frames or other angles or bars. The invention is described with reference to Specification No. 19,623. A.D. 1896, and may be arranged to effect the bevelling and bending simultaneously. The disc B, Fig. 2, carrying the middle set of bending-rolls, is moved horizontally to vary the curvature, and the segment B' carrying the bevelling-rolls is oscillated to vary the bevel. The movements are effected by the piston-rods B<3>, B<5> of fluid-pressure motors C, D, the positions being controlled by templets G, carried on sliding tables E, and acting on the controlling-valves of the motors. The templet is a copy of the bar to be produced, preferably on a reduced scale, the table being driven accordingly. The valve gear, which is similar for each motor, consists of two circular valves c<8>, c<14>, Figs. 3, 4, 5, and 6, pivoted one over the other on a valve face c<4> on the cylinder which has ports c<2>, c<3>. The valves are partly toothed at their edges and engage rack rods c<13>, c<16>. The rod c<13> is connected to the piston-rod, and the rod c<16> carries adjustable roller stops F<4> engaging the templet. The valve face has recesses c<6>, c<7>, the valve c<8> has apertures c<10>, and the valve c<14> has an aperture c<17> and exhaust passages c<20>, c<21>. The exhaust passages communicate with the exhaust c<22> through a central hole. Assuming the parts to be at the mid position shown, the displacement of the rod c<16> by the templet rotates the valve c<14> and opens one of the apertures c<10> to the pressure fluid and the other to the exhaust. This moves the piston, the rod c<13> rotating the valve c<8> in the same direction as the valve c<14> till the apertures c'‹ are again covered, when the piston comes to rest in a position corresponding to the distance of the templet from the mid position, thus determining the curvature. The motor D and its attachments are carried on a frame H sliding with the disc B, the table E being placed above the motor. The arrangement shown in Fig. 8 may then be used. A right and left handed screw K<4> is carried by arms K on the rod c<16>, and has adjustable stops or nuts K<3>. A block K<5>, carrying rollers K<10> to engage the templet, can slide on the screw between the stops. In the mid position shown, a pawl K' on the block is held out of engagement with a groove K<6> in the screw by a projection on a bar L fixed on the frame carrying the table E. The spaces between the stops and the block allow lost motion between the templet and rod c<16>, and by successively decreasing these spaces the curvature of a bar may be increased at each passage through the machine till it attains the curvature of the templet. The stops F<4>, Fig. 2, can be adjusted to give the same effect. The intermittent adjustment is made by a star-wheel K<14>, frictionally mounted on the screw and operated from the table E. The templet may be held in place by screws E<7> with heads E<8>. The nuts E<9> of the screws have pins E<10> which may be placed as desired in holes in the table, final adjustment being made by turning the screws.