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An impact device includes a housing, a motor supported by the housing, a stationary shaft, and a rotating transmission member supported on the stationary shaft for rotation. The rotating transmission member includes a hub having a first cam surface. The impact device also includes a rotating impact

An impact device includes a housing, a motor supported by the housing, a stationary shaft, and a rotating transmission member supported on the stationary shaft for rotation. The rotating transmission member includes a hub having a first cam surface. The impact device also includes a rotating impact member carried by the transmission member and rotatable relative to the transmission member. The rotating impact member includes a lug protruding from an outer periphery of the rotating impact member and a second cam surface. The impact device further includes a spherical element engaged with the first and second cam surfaces on the hub of the rotating transmission member and the rotating impact member, respectively, an energy-absorbing member exerting a biasing force against the rotating impact member, and a reciprocating impact member oriented substantially normal to the stationary shaft and impacted by the lug of the rotating impact member.

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1. A impact device comprising: a housing;a motor supported by the housing;a stationary shaft defining a longitudinal axis and fixed relative to the housing;a rotating transmission member drivably coupled to the motor and supported on the stationary shaft for rotation about the longitudinal axis, the

1. A impact device comprising: a housing;a motor supported by the housing;a stationary shaft defining a longitudinal axis and fixed relative to the housing;a rotating transmission member drivably coupled to the motor and supported on the stationary shaft for rotation about the longitudinal axis, the rotating transmission member including a hub having a first cam surface;a rotating impact member carried by the transmission member and rotatable relative to the transmission member, the rotating impact member including at least one lug protruding from an outer periphery of the rotating impact member and a second cam surface;a spherical element engaged with the first and second cam surfaces on the hub of the rotating transmission member and the rotating impact member, respectively;an energy-absorbing member exerting a biasing force against the rotating impact member; anda reciprocating impact member oriented substantially normal to the stationary shaft and impacted by the lug of the rotating impact member. 2. The nailing device of claim 1, wherein the spherical element and the first and second cam surfaces are configured to displace the rotating impact member along the longitudinal axis, against the biasing force of the energy-absorbing member, in response to relative rotation between the rotating transmission member and the rotating impact member. 3. The impact device of claim 2, wherein the relative rotation between the rotating transmission member and the rotating impact member is caused by the lug impacting the reciprocating impact member. 4. The impact device of claim 1, wherein at least a portion of the first cam surface is inclined in a first direction with respect to the longitudinal axis, wherein at least a portion of the second cam surface is inclined in a second direction with respect to the longitudinal axis, and wherein the first and second directions are substantially parallel. 5. The impact device of claim 1, wherein the first cam surface includes a first portion inclined with respect to the longitudinal axis and a second portion oriented substantially normal to the longitudinal axis. 6. The impact device of claim 5, wherein the second cam surface includes a first portion inclined with respect to the longitudinal axis and a second portion oriented substantially normal to the longitudinal axis. 7. The impact device of claim 6, wherein the rotating impact member is axially displaceable along the stationary shaft between a first position, in which the spherical element is positioned within the second portion of each of the first and second cam surfaces, and a second position, in which the spherical element is positioned within the first portion of each of the first and second cam surfaces. 8. The impact device of claim 7, wherein axial displacement of the rotating impact member relative to the stationary shaft does not occur in response to relative rotation between the rotating transmission member and the rotating impact member when the spherical element is moving within the second portion of each of the first and second cam surfaces. 9. The impact device of claim 8, wherein axial displacement of the rotating impact member relative to the stationary shaft occurs in response to relative rotation between the rotating transmission member and the rotating impact member when the spherical element is moving within the first portion of each of the first and second cam surfaces. 10. The impact device of claim 1, wherein the stationary shaft includes a shoulder, and wherein the energy-absorbing member is positioned between the rotating impact member and the shoulder. 11. The impact device of claim 1, wherein the motor includes a motor output shaft oriented substantially normal to the longitudinal axis. 12. The impact device of claim 11, further comprising a transmission coupled between the motor output shaft and the rotating transmission member. 13. The impact device of claim 12, wherein the transmission includes an intermediate shaft offset from the motor output shaft and oriented substantially normal to the longitudinal axis. 14. The impact device of claim 13, wherein the transmission further includes a first spur gear coupled for co-rotation with the motor output shaft, and a second spur gear coupled for co-rotation with the intermediate shaft and engaged with the first spur gear. 15. The impact device of claim 14, wherein the first spur gear includes a first plurality of teeth and the second spur gear includes a second plurality of teeth, and wherein the second plurality of teeth is greater than the first plurality of teeth. 16. The impact device of claim 14, wherein the intermediate shaft includes a pinion integrally formed therewith, and wherein the rotating transmission member includes a toothed portion engaged with the pinion. 17. The impact device of claim 1, wherein the lug includes an impact surface intermittently engageable with the reciprocating impact member, and wherein the impact surface includes an involute profile. 18. The impact device of claim 1, further comprising a motor-activation switch electrically connected to the motor, anda trigger operable to actuate the switch between an open state and a closed state, wherein the trigger is located on a side wall of the housing. 19. The impact device of claim 18, further comprising a battery supported by the housing, anda controller electrically connected to the battery, wherein the motor-activation switch is electrically connected to the motor through the controller. 20. The impact device of claim 18, wherein the motor-activation switch includes a toggle which when moved to a locking position inhibits the switch from actuating between the open and closed states, and which when moved to an unlocked position permits the switch to actuate between the open and closed states.