A bushing assembly for a reciprocating device is provided. The bushing assembly includes a hollow bushing housing, a collet guide member, and an adjuster mechanism. The hollow bushing housing has a substantially cylindrical shape and an angled inner sidewall. The collet guide member is disposed radially inward from and contacts the angled inner sidewall of the hollow bushing housing. The adjuster mechanism contacts a lower surface of the collet guide member and urges the collet guide member along the angled inner sidewall of the hollow bushing housing.

A hammer assembly used in a machine is described. The hammer assembly comprises a power member, a tool member, and a housing member. The housing member includes a first set of channels and a second set of channels. The first set of channels is disposed along a first axis and the second set of channels is disposed along a second axis in an orthogonal direction with respect to the first axis. The hammer assembly is rotated by an angle to make use of any one of the first set of channels or the second set of channels. The first set of channels is shaped to receive a first set of pins and the second set of channels is shaped to receive a second set of pins for engagement of the housing member and the tool member.

The present invention provides a hammer drill attachment for contacting external walls of formwork for imparting external vibration to concrete poured into the formwork, the attachment comprising: an input shaft configured to receive motion from an output of a hammer drill; an output shaft configured to contact the external walls of the formwork for imparting the external vibration, the output shaft being arranged transversely relative to the input shaft to output pulsed percussions in a transverse direction relative to a longitudinal axis of the output shaft, a connecting portion for connecting the output shaft with the input shaft to transmit motion from the input shaft to the output shaft when the input shaft is receiving motion from the output of the hammer drill. In another aspect of the present invention, there is provided a method for smoothing concrete contained within external walls of formwork.

An impact tool having a split anvil assembly includes an internal anvil portion fixed inside a housing of the impact tool and an external anvil portion that is removably attached to the internal anvil portion and extends outside of the housing. The external anvil portion includes a retractable pin biased to an extended position to engage the internal anvil portion to secure the external anvil portion to the internal anvil portion and depressed to a retracted position to permit the external anvil portion to be disengaged from the internal anvil portion. The internal anvil portion and the external anvil portion may include respective internal and external grooves that interconnect with each other to link the movement of the internal anvil portion to the external anvil portion.

An impact tool having a split anvil assembly includes an internal anvil portion fixed inside a housing of the impact tool and an external anvil portion that is removably attached to the internal anvil portion and extends outside of the housing. The external anvil portion includes a retractable pin biased to an extended position to engage the internal anvil portion to secure the external anvil portion to the internal anvil portion and depressed to a retracted position to permit the external anvil portion to be disengaged from the internal anvil portion. The internal anvil portion and the external anvil portion may include respective internal and external grooves that interconnect with each other to link the movement of the internal anvil portion to the external anvil portion.

A tool, such as a hammer including a handle configured to be replaceable is shown. In one embodiment, the handle includes a grip insert coupled to the shaft of the hammer and an outer grip surrounding the grip insert. In another embodiment, the hammer includes a shaft with a pair of opposing channels. The handle includes a grip insert with a pair of corresponding projections to couple to the pair of opposing channels and an outer grip surrounding the grip insert.