Drilling device
AssigneeHilti Aktiengesellschaft
InventorsMartin Richter, Wolfgang Erdt
Life of this patent
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Abstract
In a device for drilling rock, concrete, reinforced concrete and similar materials, a spindle is rotatably mounted in a housing and a drilling tool is replaceably mounted on the spindle so that the spindle and drilling tool rotate together. A gear wheel is fitted on the drilling tool. A motor is located on the housing laterally spaced from the axis of rotation of the spindle. The motor includes a drive pinion which drives an intermediate gear. The intermediate gear meshes with the gear wheel and drives the drilling tool and spindle. The spacing between the axis of the intermediate gear and the spindle is adjustable.
Claims3
Device for drilling rock, concrete, reinforced concrete and similar materials comprising a housing, a spindle located within said housing and rotatable about an axis therein, a replaceable drilling tool connectably mounted on said spindle for rotation therewith, a driving pinion located in said housing laterally of said spindle, an intermediate gear positionable in meshed engagement with said driving pinion, a gear wheel driven by said driving pinion via said intermediate gear and said gear wheel arranged to transfer rotational movement to said drilling tool, wherein the improvement comprises that said gear wheel is mounted on said drilling tool, the spacing between said intermediate gear and said spindle being adjustable with the spacing between said intermediate gear and said driving pinion being maintained the same, the diameter of the rolling circle of said gear wheel corresponds essentially to the outside diameter of said drilling tool, and said drilling tool comprising a plurality of drilling tools each of a different diameter and selectively individually replaceably connected to said spindle and the relation between the diameter of said gear wheel and of the outside diameter of said drilling tools affords the correct constant cutting speed for a specific material.
Dependencies are inferred from the claim text.