US 12,226,884 B2
High resolution anvil angle sensor
Mark T. McClung, Andover, NJ (US); and Daniel J. Becker, Monroe Township, NJ (US)
Assigned to Ingersoll-Rand Industrial U.S., Inc., Davidson, NC (US)
Filed by Ingersoll-Rand Industrial U.S., Inc., Davidson, NC (US)
Filed on Nov. 29, 2021, as Appl. No. 17/536,815.
Prior Publication US 2023/0166389 A1, Jun. 1, 2023
Int. Cl. B25D 11/06 (2006.01)
CPC B25D 11/068 (2013.01) [B25D 2217/0015 (2013.01); B25D 2250/221 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rotary power tool assembly comprising:
a hammercase having a forward end and a rearward end and defining an axis extending between the forward end and the rearward end;
a drive mechanism housed within the hammercase;
a hammer driven by the drive mechanism to apply a rotational impact force on an anvil;
the anvil having:
a longitudinally extending output shaft rotatable about the axis and supported in the forward end of the hammercase,
a plurality of anvil jaws extending from the axis, and
a flange fixedly connected to an end of the output shaft and extending radially from the axis, wherein the flange supports the plurality of anvil jaws, the flange extending over the plurality of anvil jaws and defining a plurality of arcuate protrusions on opposing coplanar sides of the flange between the plurality of anvil jaws, where the flange and the plurality of arcuate protrusions define a magnet-facing surface;
a magnetic disc directly attached to the magnet-facing surface of the flange, opposite to the plurality of anvil jaws, the magnetic disc having arc sectors divided into alternating north and south magnetic poles grouped into magnetic pole pairs; and
an anvil angle sensor attached to a front-end inner surface of the hammercase axially facing the magnetic disc, wherein the anvil angle sensor is configured to read and interpret magnetic flux changes of the magnetic pole pairs and determine the position of the anvil rotating about the axis.