Original printed patent application number 2831 for improvements in hand drilling machines 1909 dec 05 2020 posted by nora roberts media text id b958102a online pdf ebook epub library inventors on amazoncom free shipping on qualifying offers original printed patent application number 13 278 for improvements in drilling machines 1909 well servicing. A drilling machine for drilling fishplate holes in the end of a rail 10 for a railway or railroad track comprises an electric power drill 20 slidably mounted on a column 14 and supporting on its spindle arbor 58 an annular cutter 26 the column 14 is attached to a base 12 which is firmly clamped to the rail 10 by a clamping mechanism 16a. John l ssin0r to hamilton zbatea a drilling machine id atnie l l b ate 5 patented aug 81871 invent 0p f w mam u cqqu a l0c 5 n ited states patent office john lemman of oinoinnati assignor to hamil on bates and daniel l bates 0f dayton ohio improvement in drilling machines. A drilling apparatus 1 is for use on a rotary drilling rig with a top drive which enables circulation and rotation of a drill string 3 to continue uninterrupted during the making of drill string connections it has a snubber gripping mechanism 10 9 to enable tool joints 2 3 to be supported and gripped with a reduced pressure chamber 5 volume and snubbing force during tool joint . Authors de robien e fritz g lachambre a mettetal j c publication date wed mar 10 000000 est 1965 research org originating research org not identified
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