US 11,701,789 B2
Hand-held knockout punch driver
James O. Myrhum, Jr., West Bend, WI (US); Troy C. Thorson, Cedarburg, WI (US); and Koon For Chung, Hong Kong (CN)
Assigned to MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Jun. 14, 2021, as Appl. No. 17/347,121.
Application 17/347,121 is a continuation of application No. 16/370,104, filed on Mar. 29, 2019, granted, now 11,034,047.
Application 16/370,104 is a continuation of application No. 15/188,022, filed on Jun. 21, 2016, granted, now 10,252,438, issued on Apr. 9, 2019.
Application 15/188,022 is a continuation of application No. 13/444,772, filed on Apr. 11, 2012, granted, now 9,393,711, issued on Jul. 9, 2016.
Claims priority of provisional application 61/474,156, filed on Apr. 11, 2011.
Prior Publication US 2021/0299902 A1, Sep. 30, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B26F 1/34 (2006.01); B21D 28/34 (2006.01); B26D 5/08 (2006.01); B26F 1/36 (2006.01); B26F 1/38 (2006.01)
CPC B26F 1/34 (2013.01) [B21D 28/343 (2013.01); B26D 5/086 (2013.01); B26F 1/36 (2013.01); B26F 1/38 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A hand-held knockout punch driver comprising:
a housing;
a motor positioned within the housing;
a drive assembly at least partially positioned within the housing and including an output member movable relative to the housing;
a head unit removably coupled to the housing, the head unit including
a body,
an input member movable relative to the body, and
a draw rod to which at least one of a punch or a die is attachable, the draw rod configured to move axially relative to the body in response to movement of the input member relative to the body; and
a quick-release mechanism configured to removably couple the head unit to the housing,
wherein the output member is configured to engage the input member such that the input member moves relative to the body in response to movement of the output member relative to the housing, and
wherein the body is engageable with the quick release mechanism separately from the engagement between the output member and the input member.