Patent ID: 8844696
Filing Date: 2014-09-30
Classification: F16D,F16P,Y10S,Y10T

Abstract:
1. A clutch mechanism for a power tool having a blade that is driven by a motor that is coupled by a drive shaft, said clutch mechanism comprising: a spring assembly generally annularly disposed around the drive shaft, when said spring assembly is compressed, said spring assembly applies a normal force on the blade to force the blade against a generally annular lip; an upper retainer generally annularly disposed around the drive shaft and configured to compress said spring assembly, said retainer having at least one shallow pocket and at least one deep pocket in a lower surface of said retainer; at least one geometric spacer disposed between said spring assembly and said upper retainer; wherein said spring assembly is disposed between said upper retainer and the blade; wherein when a braking pressure is applied to the blade, said blade will slip with respect to one of said spring assembly or said generally annular lip, which causes said geometric spacer to displace out of engagement with said shallow pocket and engage into and remain seated in said deep pocket and reduce the normal force applied by said spring assembly onto the blade.