442203-A is referenced by 1 patents.
442,203. Boring earth; tunnelling &c. RANNEY, L., Petrolia, Ontario, Canada. July 23, 1934, No. 31715/35. Divided out of 442,008. [Classes 68 (i) and 85] Earth-boring means comprises an outer pipe spaced from an inner pipe, and a pointed boring head connected to the pipes and provided with perforations, through which the earth can pass to the inner pipe, only the inner pipe normally communicating with the interior of the boring head. The boring means comprises a perforated sectional tube 6, Figs. 3 and 3a, which may be surrounded by an outer tube 39 with fine, staggered slots. The forward end of tube 6 carries a boring head 7, Figs. 4 and 6, with slots 8 widening inwardly and rearwardly and flanked by ridges 9 ; between slots 8 are rear slots 13 behind ridges 14, and the slots 8, 13 may have rear inclined surfaces 12 to lift stones.; An inner imperforate tube 15 is detachably secured at 15b to the boring head and allows passage of water and fine material to the shaft, or of a water jet to clear the boring head &c. ; tube 15 may be connected through a packed sleeve 19, Fig. 9, and a driving head 16 to a suction pump for removal of material. The space between the tubes 6, 15 is sealed by a slidable tube 23, Figs. 3 and 3a, with outer packings 24 and forward packing 27. In running sand &c., a spring-pressed valve 35, Fig. 4, is arranged in the boring head to be opened by the pipe 15. The pipe 15 may be slidable to control ports giving access to the tube 6. The device may be modified for driving tunnels &c. ; larger slots may be provided on one side of the boring head to facilitate steering, or some slots may be closable.; Cement &c. may be injected through the apparatus to consolidate surrounding soil, and two or more units may be advanced in adjacent parts to give connected consolidated zones. Specification 442,008 is referred to.