Black Decker Inc.

University System of Maryland

Gerald J Rescigno

Rodney D Milbourne

Qiang J Zhang

Christine H Potter

Martin P Gierke

Jonathan L Miner

Vernon R Lacher

William B Swim

David A Hahn

Rickey James Thomas

Muniswamappa Anjanappa

Russell M Timmons

Stephen R Crosby

Li Xu

A clutch arrangement that includes a clutch member and a follower member. The clutch member is coupled to a member of the transmission assembly that is proximate the torsional input of the transmission assembly and which must be in a non-rotating position to permit the transmission assembly to perform a torque multiplication operation. The follower member is biased into engagement with the clutch member to inhibit relative rotation therebetween. As the clutch member and the transmission member are coupled to one another, the transmission assembly is able to perform a torque multiplication operation. When, however, the torsion that is exerted onto the clutch member is sufficient to overcome the frictional engagement between the follower and clutch members, the clutch member, and the transmission member, rotate, thereby inhibiting the capability of the transmission to continue to perform the torque multiplication operation.

Power tool with torque clutch

A clutch arrangement for use in a power tool having a multi-speed transmission assembly. The clutch arrangement includes a clutch member and a follower. The clutch member is coupled to a member of the transmission assembly that is proximate the torsional input of the transmission assembly and which must be in a non-rotating position to permit the transmission assembly to perform a torque multiplication operation. The follower is biased into engagement with the clutch member to inhibit relative rotation therebetween to permit the transmission assembly to perform a torque multiplication operation. When, however, the torsion that is exerted onto the clutch member is sufficient to overcome the frictional engagement between the follower and clutch members, the clutch member, and the transmission member, rotate, thereby inhibiting the capability of the transmission to continue to perform the torque multiplication operation.

A metal cutting drill bit has a shank portion, a flute portion defining a helix angle and a tip. The tip has a primary cutting edge extending to an outer periphery of the drill bit. The primary cutting edge has a rake face defining a rake angle. The rake angle is different from the helix angle at the tip of the drill bit.

High speed metal drill bit

A clutch assembly for limiting a torque output of the power tool. The clutch assembly includes an annular rotatable clutch member, which is coupled to the ring gear of a planetary gearset in a transmission, and an engagement assembly. The clutch member has a clutch face with a predetermined clutch profile. The engagement assembly has at least one follower member that abuts the clutch member and cooperates with the clutch profile to inhibit rotation of the clutch member relative to the follower member only when the magnitude of the torque output of the power tool is less than a predetermined maximum torque. The clutch face on the clutch member is located between the opposite axially ends of the ring gear.

First stage clutch

A clutch arrangement for a power tool having a multi-speed transmission. The clutch arrangement includes a clutch member and a follower member. The clutch member is coupled to a member of the transmission that is proximate the torsional input of the transmission and which must be in a non-rotating position to permit the transmission to perform a torque multiplication operation. The follower member is biased into engagement with the clutch member to inhibit relative rotation therebetween. As the clutch member and the transmission member are coupled to one another, the transmission is able to perform a torque multiplication operation. When, however, the torsion that is exerted onto the clutch member is sufficient to overcome the frictional engagement between the follower and clutch members, the clutch member, and the transmission member, rotate, thereby inhibiting the capability of the transmission to continue to perform the torque multiplication operation.

A portable rechargeable battery-operated slender tubular blower for removing relatively light debris from hard surfaces such as sidewalks, driveways, decks or workbench surfaces. The blower uses an axial flow blower fan arranged for noise minimization and energy efficient operation. Blower tube inlet and outlet portions are arranged debris removal effectiveness by optimizing airflow volume and velocity parameters.

Portable blower

A portable rechargeable battery-operated slender tubular blower for removing relatively light debris from hard surfaces such as sidewalks, driveways, decks or workbench surfaces. The blower uses an axial flow blower fan arranged for noise minimization and energy efficient operation. Blower tube inlet and outlet portions are arranged for debris removal effectiveness by optimizing airflow volume and velocity parameters.

Growing community of inventors

Baltimore, MD, United States of America

Gerald J Rescigno