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    • 15. 发明专利
    • Improvements in or relating to apparatus for consolidating and levelling materials applied to roads and like surfaces
    • GB247271A
    • 1926-02-10
    • GB2680424
    • 1924-11-10
    • JAMES MITCHELL THOMAS JOHNSTON
    • E01C19/41
    • 247,271. Johnston, J. M. T. Nov. 10, 1924. Rammers.-Power-operated tamping-machines in which the tamping shoes are carried by camoperated plungers are furnished with means for automatically traversing a scraper across the sole of each of the shoes when these are in raised position. The arrangement serves to remove bituminous or like matter, adhering to the shoes, and may be combined with automatic means for wetting the shoes. In the machine shown in Fig. 1, three tampers 7 are arranged in a transverse row on a frame 10 which can be inclined on a pivot 11 by hand-gear 16, 13 to suit the inclination of the road. The tampers, which fall by their own weight, are raised in sequence by snail cams 19 on a shaft 17 driven by spur-gearing from a pinion 22 surrounding the shaft 11 and rotated by a belt 26 from a driving shaft 25. Catches 28 operated by links 29 serve to hold the tampers in raised position. Adjacent parts of the tamping heads are guided over one another by side extensions 12. When in raised position, the tamping soles are cleaned by spring-pressed scrapers 32 carried by arms 33 automatically reciprocated by cams 41, Fig. 3, on the shaft 17. The scrapers are supported against dropping by rollers 43 carried by a frame 44 which also supports a guard apron 45. Water from jets 49 is directed on the tamping soles when in raised position by a pump 48 operated from the cam 41. In place of the pump, the soles may be wetted by felt-covered rollers revolving in a water trough carried by the arm 33.