A percussion tool comprises a housing and an electric motor positioned within the housing. The percussion tool further comprises a battery pack supported by the housing for providing power to the motor. The battery pack includes a plurality of battery cells having a nominal voltage of up to 120 Volts. The percussion tool further comprises a percussion mechanism driven by the motor and including a striker supported for reciprocation in the housing. The percussion tool has a ratio of impact energy to mass that is greater than or equal to 2.5 Joules/kilogram.

A hammer head with an internal cavity including weights that are sized to restrict the weights from escaping from a crack in the hammer or are easily collected and accounted for should the hammer separate to ensure foreign objects and debris do not contaminate sensitive work spaces. The weights are shaped to allow the weights to longitudinally move in the internal cavity. The weights may take the form of a number of different shapes.

A hammer head with an internal cavity including weights that are sized to restrict the weights from escaping from a crack in the hammer or are easily collected and accounted for should the hammer separate to ensure foreign objects and debris do not contaminate sensitive work spaces. The weights are shaped to allow the weights to longitudinally move in the internal cavity. The weights may take the form of a number of different shapes.

A hand-held driver device, comprising a solid impact body, configured to provide a user a surface for driving fasteners, an adjustable strap attached to a top surface of the solid impact body for retaining the solid impact body on the user's hand, a pair of inextensible rings attached to the adjustable strap, the pair of inextensible rings laterally opposed to each other and configured to provide a secure attachment point between the adjustable strap and the solid impact body, an adjustment device attached to the adjustable strap for modifying the length of the adjustable strap, an insulating surface integral to the top surface of the solid impact body, which is configured to conform to the shape of the user's hand and provide impact protection to the user's hand during use of the hand-held driver device, and a sacrificial bottom surface integral to the solid impact body, which is configured to make contact with the fasteners.

The present invention is an adjustable weight dead blow hammer comprising a hollow head filled with an acceptable fill material. A handle is connected to the head wherein the handle has a hollow chamber that traversers the length of the handle and has an opening into the head. The weight of the hammer head may be adjusted by moving the fill material between the head and the hollow chamber in the handle. Adjustment may be accomplished by a corkscrew device which is disposed within the hollow chamber and having a screw tip at the opening and c screw head on an outside portion of a bottom end of the handle. The corkscrew device within the hollow chamber moves the fill material between the head and the handle. More fill material in the head increases the force of impact, and less fill material in the head decreases the force of impact.

A hand tool may include a head, a handle and one or more instances of an adjustable weight. The head may include a bell and a face for delivering an impact. The handle may be operably coupled to the head and extend linearly away from the head along an axis. The adjustable weight may be positionable on the head and/or the handle at a selected one of a plurality of different locations relative to the axis such that the hand tool is configurable to adjust both a striking power and a swinging balance of the hand tool.

A percussion tool comprises a housing, an electric motor positioned within the housing, a percussion mechanism driven by the motor and including a striker supported for reciprocation in the housing along a first axis, and a pair of handles coupled to the housing. The handles define a second axis. The percussion tool further comprises a battery pack removably coupled to the housing for providing power to the motor when coupled to the housing. The first and second axes are contained within first and second planes, respectively, that are parallel to each other.

Adjustable weight striking device can be selectively loaded with weighting material to temporarily increase striking force during use and unloaded to reduce weight while carrying. The tool has body made of low density material and working end for striking tool, handle extending from the body made of low density material, striking tool at working end, and apparatus for holding weighting material adjacent to the body. The weight holding apparatus can be platform with straps or other securing feature for temporarily holding weighting material and/or an interior chamber within the body for receiving weighting material. Weighting material can be sand, water, dirt, gravel, rock, or metal and can temporarily increase the weight of the striking tool by 50%, 100%, 200% 250%, 300%, 400%, 500% or more depending on volume and/or density of weighting material as compared to striking device.

A method for reducing vibrations in a percussion tool includes activating, using an electronic controller of the percussion tool, the motor of the percussion tool, determining, using the electronic controller, that the percussion tool is in a loaded condition, and operating, using the electronic controller, the motor in accordance with a predetermined profile in response to determining that the percussion tool is in the loaded condition. The method also includes determining, using the electronic controller, that the percussion tool is in a no-load condition and operating, using the electronic controller, the motor with reduced speed in response to determining that the percussion tool is in the no-load condition.

A hand-held driver device, comprising a solid impact body, configured to provide a user a surface for driving fasteners, an adjustable strap attached to a top surface of the solid impact body for retaining the solid impact body on the user's hand, a pair of inextensible rings attached to the adjustable strap, the pair of inextensible rings laterally opposed to each other and configured to provide a secure attachment point between the adjustable strap and the solid impact body, an adjustment device attached to the adjustable strap for modifying the length of the adjustable strap, an insulating surface integral to the top surface of the solid impact body, which is configured to conform to the shape of the user's hand and provide impact protection to the user's hand during use of the hand-held driver device, and a sacrificial bottom surface integral to the solid impact body, which is configured to make contact with the fasteners.