Patent ID: 9089939
Filing Date: 2015-07-28
Classification: B23Q,Y10T

Abstract:
1. A set comprising: A plurality of exchangeable gearing cassettes with different gear ratios for changing a drill shaft rotation velocity of a gearbox in a drilling unit, wherein said gearbox is provided with an output coupling part and an input coupling part, wherein each of said cassettes is detachably mountable on an outside of said gearbox, and wherein each of said cassettes comprises: a housing; at least two meshed gearings with a certain gear ratio which are provided in said housing; an input coupling part and an output coupling part which are each connected to respective ones of said gearings; and interconnecting means for connecting said input coupling part of said cassette directly to said output coupling part of said gearbox, and for connecting said output coupling part of said cassette directly to said input coupling part of said gearbox, for adapting a total gear ratio of said gearbox to a given unit application; wherein said gearings are provided in said housing of said cassette such that said gearings are removed from the gearbox together with said housing of said cassette when said cassette is detached from the gearbox.