Patent GB-520629-A (GB)
Title: Apparatus for use in surface-hardening the guideways of a lathe or other machine-tool
IPC: C21D1/08
Filed: 1938-10-12
Abstract: 520,629. Gas burners. ABE, P. A. Oct. 12, 1938, No. 29552. Convention date, Sept. 16. [Class 75 (i)] [Also in Group II] In apparatus for surface-hardening the guideways of a lathe or other machine tool, the part of the tool incorporating the guideways is supported in a tank with the guideways at a predetermined height, the tank containing liquid which is maintained at a predetermined height so as wholly or mainly to submerge the guideway, a framework being provided outside the tank and having a track at each side along a carriage carrying a flame nozzle is slidably guided on wheels. The nozzle may form part of a body which is also provided with quenching nozzles for producing a spray just behind the flames. The lathe 13 &c. is supported in a tank 3 on a bed 11 adjustably mounted on elevator screws 7 mounted on bearings 8, 9. Water is fed to the tank by a pump and the height 14 of the water is kept at a predetermined height by a overflow pipe 25..A member 32 is provided with grooved wheels 29 which run on V-shaped rails 27 carried by uprights 26 supported on the base 1 of the tank 3. The burners 34, 36, 37 are mounted on tube 35, to which are connected gas supply pipes 41, 42 and each tube 35 is supported by a clamp 56 on arms 55 which is disposed within a sleeve 61 mounted on a support 63 disposed within a sleeve 64 attached to a support 65 which is slidably mounted on a support 51. One of the bifurcated ends 50 of the support 51 is threaded to receive a shaft 48 mounted on plates 49 carried by the member 32, and both bifurcated ends 50 engage a transverse rail also carried by the member 32. The shafts 48, one for each burner are connected by flexible cables which are operated by a hand wheel 47 to move the supports 51 transversely of the tank 3. Each support 51 is engaged by a threaded rod 66 which is rotatably mounted on a bracket 67 of a sleeve 64 and is provided at the upper end with a worm 68 engaging a worm gear 69 on a shaft 70 which is actuated by a cable 72 to provide a vertical adjustment of the burner. A manual adjustment may be effected by a hand wheel 73. An apron 31 depending from the member 32 is provided with a lead screw unit which, by a handle 76 is engaged with, or disengaged from a screw 77 journalled at one end in a bracket; and at the other end in a bearing, both on the frame 26. On the end of the screw 77 is a worm and worm gear which engages a worm shaft connected to the armature of a driving motor F so that the carriage 32 can be moved on its tracks 27 and the burners positioned correctly with regard to the work. The work to be treated may be arranged so that the surface to be treated is just below the surface of the water in the tank mounted in the carriage 32 is a metal plate 33 which supports a transverse water spray 38 so that the water sprayed on the plate curls it and protects the members 51 and 67. The burner 36, Fig. 15, which is provided with gas discharge passages 86, 87 is also provided with water passages 83, 84 which communicate with a discharge part 85 below the passage 86. 87 so that the port heated by the flame is immediately quenched. Specification 303,196, [Class 72], is referred to.