Patent ID: 7210567
Filing Date: 2007-05-01
Classification: F16D,F16H,Y10T

Abstract:
1. Transmission device for two or more shafts, which comprises a first cylindrical sleeve which is connected to a first shaft and can be mechanically coupled or uncoupled with a second cylindrical sleeve connected to a second shaft, by tightening or loosening, respectively, a first helical spring arranged in a substantially coaxial manner astride the two cylindrical sleeves, a first end of the first helical spring being arranged into a seat in a control collar for coupling or uncoupling the first cylindrical sleeve with the second cylindrical sleeve, wherein a transmission member mechanically connected to the first shaft is fixed between the first cylindrical sleeve and a further first cylindrical sleeve which can be mechanically coupled or uncoupled with a further second cylindrical sleeve connected to the second shaft or to a third shaft aligned with the second shaft, by tightening or loosening, respectively, a second helical spring arranged in a substantially coaxial manner astride these two further first and second cylindrical sleeves, a first end of the second helical spring being arranged into a seat in a second control collar for coupling or uncoupling the further first cylindrical sleeve with the further second cylindrical sleeve, wherein the first and second control collars are mechanically coupled with first and second tubular members, respectively, so that the mutual translation of a control collar with respect to the corresponding tubular member also causes their mutual rotation, wherein the second ends of the helical springs are arranged into a seat in the tubular members so that the mutual rotation of a first or second control collar with respect to the corresponding tubular member tightens or loosens the coils of the corresponding helical spring, the coils of the helical springs being arranged with opposite coiling directions.