Patent · US Active

Fastener setting algorithm for drill driver

US8919456B2 · kind B2 · utility

93Cited by

125References

17Claims

0Family size

Assignee

BLACK & DECKER INC. · US

Inventors

Wong Kun Ng · New York, US
Christopher W. Shook · Bel Air, US

Key dates

Filing date	Mar 15, 2013
Grant date	Dec 30, 2014
Priority date	—
Expiry date	Mar 15, 2033

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25B23/147
WIPO fieldControl
WIPO sectorInstruments

Abstract

An improved technique is presented for detecting when a fastener driven by a drill driver has reaches a desired stopping position. The improved techniques generally includes: sampling periodically current delivered to the electric motor; storing a sequence of current measures most recently sampled; and determining a slope for the sequence of current measures by way of linear regression. Transmission of torque to the output spindle can be interrupted based in part on the slope of the current measures.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.