Patent GB-228082-A (GB)
Title: Improvements in apparatus for galvanising of iron or steel wire and other articles
IPC: C23C2/38
Filed: 1923-07-21
Abstract: 228,082. Herman, J. L. July 21, 1923. Galvanizing. - In apparatus for galvanizing iron or steel wire &c. and for carrying out the process described in Specification 208,733, skimming means are adapted to engage the wire &c. after leaving the coating bath and before entering the heat-treating furnace so as to remove the dross, skimmings and other foreign matter but permitting the passage of the wire &c. without reducing the thickness of the coating. At' the outer end of a housing 22 provided with a plurality of chambers and secured to the front end of a passage 7 as described in Specification 227,875, is mounted a support 21 carrying upstanding guides 20 provided with grooves 25 in which the skimming members 18, 19 are removably mounted. The members 18, Fig. 4, are provided with converging surfaces which rest on supports 28 and terminate in concentric annular grooves or slots 27. Registering with the grooves 27 and forming a circular aperture therewith are similar grooves or slots 30 in the oppositelytapered peripheries of discs 29 provided with trunnions 31 slidably mounted in the guides 25. The width and depth of the grooves 27, 30 are determined by the gauge or size of the wire &c. so as to provide an opening of sufficient size to allow the wire &c. to pass through and remove the dross &c. but not the coating. When a joint 13a in the wire &c. comes into contact with the members 18, 19, it will raise and turn the member 19 which drops back into position and presents a fresh surface to the wire &c. immediately he joint has passed. Each chamber in the housing 22 is provided with a hinged inspection cover 32. Tensioning and guiding devices as described in Specification 227,875 are provided at the other end of t'he furnace 7. In a modification, Fig. 10, the member 19 is substituted by a slidable block 46 to which is secured a plate 47 having tapered ends 48, Fig. 13, which converge to a groove or slot 49 which coacts with the slot 27 in the member 18. Secured to the block 46 is a plate 50 having an inturned lower portion 51 which will be engaged by a joint 13a in the wire and raised, thus raising the block 46 to allow the joint to pass through, the block 46 falling back into position immediately. In a further modification, Fig. 17, the members 18 are substituted by threaded shafts 53, the pitch of the threads being determined by the gauge or size of the wire &c. to be treated. Instead of the members 19 are provided ring members 54 internally threaded at 55 to mesh with pinions 56 arranged on a shaft 57 which is driven so that the members 54 are turned gradually to change the surface presented to the coated wire &c. as it passes between the threads on the shaft 53 and the members 54. The members 54 float on the pinions 56 so that they can be raised by the passage of a joint 13a on the wire &c. To position correctly the threads on the shaft 53 in relation to the members 54, plate members 68 with toothed upper ends 69 to mesh with the threads on the shaft 53 are adjustably mounted on the housing 22. The edges of the entrances to the chambers in the housing 22 are bevelled to guide the wires &c. accurately to the skimming means which are arranged so that the dross &c. drains back into the coating bath, or a separate bath may be arranged between the coating bath and the furnace 7.