Patent GB-247257-A (GB)
Title: Improvements in apparatus for lining pipes with one or more coats of cement or otherprotective substance or substances
IPC: B28B21/30
Filed: 1924-11-03
Abstract: 247,257. Stalley, H. F. Nov. 3, 1924. Centrifugal machines.-A centrifugal apparatus for lining metal and other pipes with cement, concrete, &c., and for coating the inner surface of such lining with asphalt, paint, &c. comprises two drums 5, 6 within which the pipe 1 is centrally held, and which are rotated by rollers 9, 9<1> on which they rest, motion being derived from a belt-driven shaft 10. The, pipe is centred in the drums by spring palms 34, Figs. 4 and 12, which are carried by levers 29 pivoted at 30 to the drum body in such a manner that cam bars 28 carried on a slidable ring 27 operated through a rack 35 by spur-wheels 37 carried by levers 39 on rock shafts 40 can be moved relatively to the drum so as to force the spring palms 34 outwards to clamp the pipe in a central position. The rock shafts 40 are mounted on fixed brackets 39 on the supporting frames 7, 8 and are operated to engage and disengage the spur-wheels 37 from handles 54 through shafts 53 carrying cams 52, Fig. 9, which operate to rock the levers 39 and also levers 51 so that the gears 37 are engaged with the racks and simultaneously nose-pieces 55 enter slots 56 in the drums and them to the supporting frames and projections 63 engage slots 62 in slidable rings 61 and move them so that pawls 36, Fig. 12, are disengaged from the racks 35, thus ensuring that rotation of the gears 37 causes relative movement between the rings 27 and the drum bodies. The gears 37 are rotated through gears 42 also carried by the shafts 37 and engaging gears 43 throughout the rocking movement of levers 39, so that when a handle 47 is turned motion is communicated through shafts 44 to the gears 43, 42, and 37 and to the racks 35. When the requisite relative movement between the rings 37 and the drum bodies has been achieved the gears 37 are disengaged and the racks and drums locked together in their adjusted relation by reversing the rotation of shafts 53 by which projections 63 slide rings 61 back so that the drums and racks are again locked together, while simultaneously a lug 59 on shaft 53 engages a hook 58<1> and positively pulls the gear 37 out of engagement. The pipe is introduced into the apparatus by mounting it on a carriage 2 running on a track 4 and moved e.g. by pawls engaging lugs on an endless wire rope 14 operated from a driving pulley 18. To accommodate pipes of different length the drum-carrying frame 8 is made adjustable, movement being effected by a gear 66 engaging a rack 65, the gear being rotated by a pawl 68 operated by a handle 70. Clamping means are provided in locking the frame 8 in the adjusted position. The shafts 44 and 53 are made telescopic to allow of this lateral movement of the frame 8. A brake band 87 is provided on each drum operated from a handle 88 through a telescopic shaft 83 and brake pull arms. Provision is made for adjusting the spring palms 34 of one drum independently of those of the other by employing a worm wheel 45 in two separable halves or two separate wheels which are feathered on the parts of the shaft 44 and can be moved laterally by operating levers 97 so as to disengage the worm wheels from the driving-worm.