Patent GB-241269-A (GB)
Title: Improvements relating to cutting by means of the oxy acetylene or other suitable jet process
IPC: B23K7/00
Filed: 1924-07-15
Abstract: 241,269. Godfrey, A. July 15, 1924. Perforating and dividing by fusion.-In a blowpipe-cutting apparatus, the blowpipe, which is supported at a constant distance from the surface of the work, is fed along irregular contours or curves by a guide pin and roller and a concentric feeding roller, the guide pin &c. engaging a templet and the feed roller engaging a surface approximately equidistant at all points from the templet, pressure being applied so that each is pressed against its surface of engagement. The blowpipe head 4, Fig. 1, is mounted in alignment with the guide roller G and feed roller F on a jointed arm 3 pivoted to a column 2. A templet 11 mounted on a slotted support 11<b> has a surface 12 for engagement with interchangeable guide pins or rollers G formed on an inner wall 14 mounted on a base 15 from which projects a deeper wall 16 for engagement with the feed roller F. The feed roller may consist of rubber or like material mounted between fixed and loose flanges 6, 8 on the driving spindle 10, the roller being compressed by a nut 9 so as to force the roller and guide pin into contact with their respective engaging surfaces. The spindle is driven by worm gear 22, 21 and reversible gear 20, 19, 18 from a flexible shaft. The spindle and its driving gear is adjustable vertically in the arm of a sleeve 28. In order that the cut mav be started off the line of the finished cut until the jet is functioning properly, the sleeve 28 is angularly adjustable on a spindle 23 held between steel points 24 at the end of the arm 3, the adjustment being effected by a hand worm 29 on a bracket fixed to the spindle 23 engaging a sector or tooth 30 fixed to the arm of the sleeve. The set position is determined by a detachable stop 31. The blow pipe head is carried by a clamp 40 vertically adjustable by a screw and hand wheel 26 carried by a bracket 25 fixed to the spindle 23 and may also be mounted so as to be given a limited free vertical movement relatively to a wheel running on the surface of the work. A straight templet 11<a> adjustable on the slotted support may be used. The arm 3 may be mounted from a carriage movable on a single or compound slide. In a modification, Fig. 5, the spindle 10 carrying the feed and guide rollers F, G, and driving mechanism therefor, is mounted in a carriage 33 freely movable on rods 34 on a bracket 35 freely movable on a longitudinal slideway 36. The blowpipe is mounted on the jointed arm 3 as in the prior form, and fixed to the carriage by a split collar 41. The means for moving the blowpipe away from or towards the line of cut consists of an eccentric sleeve 37. The blowpipe may be tilted by adjustment of its clamp 40 and the mounting may be adjusted about a vertical axis and clamped in position by the split collar 41 so as to maintain the blowpipe in a definite horizontal angular position. The templet 11 is placed away from the blowpipe so as to leave the cutting operation unobstructed. In the form shown in Fig. 7 the blowpipe 4 is carried by a slotted arm 45 directly connected to the freely movable carriage 33, and capable of radial and angular adjustment with respect thereto. The carriage, in which is mounted the driving gear and guide and feed rollers travels on a girder 43 running on a slideway 44. The flexible shaft 48 is driven by adjustable friction gear 51, and belt gear 50, 49 from a motor 47 on a truck 46. The machine may be placed on work in situ for cutting ventilated holes in the armoured deck 52 of a ship or may be mounted on wheeled supports to serve as a portable machine. In a further form, Fig. 10, for cutting horn plates from a plate 56 supported on a rotary table 57, the carriage 33 slides on rods or tubes 43 carried by a bracket 35 sliding on rods or tubes 44. The templet 11 is supported by a bracket 54 adjustable along a rod 35. Fig. 13 shows another means for moving the blowpipe relatively to the line of cut. This consists of an eccentric sleeve 61, operation of which also separates the worm 21 and worm wheel 22 to permit quick positioning of the feed roller round the templet. The spindle 10 may have a tubular portion 10<a> with split collet 10<b> secured to the upper portion by a nut 10<c> so that the spindle may be vertically adjusted or removed for cutting circles. In the latter case a stud bolt is secured in the tubular part 10<a> to receive a radially adjustable arm carrying the blowpipe. Instead of using an expansible rubber feed roller, elastic material may be inserted in the feeding surface, the surface or roller being slightly tapered, and the roller spring pressed upwardly, or an elastic mounting for the guide and feed rollers may be used, the feed roller being preferably magnetic so as to draw the guide roller into engagement. Specifications 130,450, 202,666, 202,932, 202,933, 202,934 are referred to.