Patent ID: 8794348

Claim:
A driver comprising: a housing defining a handle; a motor received in the housing; a planetary transmission driven by the motor, the planetary transmission having an output stage with an output planet carrier and a plurality of output planet gears, the output planet carrier having a carrier body and a plurality of pins that are fixedly mounted to the carrier body, the output planet gears being rotatably mounted on the pins, the output planet carrier functioning as the output of the planetary transmission; a plurality of first guide elements coupled to and circumferentially spaced about the output planet carrier, the first guide elements being integrally and unitarily formed with the carrier body; a collar received about the carrier body, the collar having a plurality of second guide elements and a plurality of engagement lugs, the second guide elements being engaged to the first guide elements to permit the collar to rotate with and slide on the carrier body; and a rotary impact mechanism having a spindle, a hammer, an anvil and a hammer spring, the spindle being fixedly coupled to the carrier body for rotation therewith, the hammer comprising a plurality of hammer lugs and a plurality of engagement recesses, the anvil comprising a plurality of anvil lugs, the hammer spring being disposed between the carrier body and the hammer and biasing the hammer toward the anvil such that the hammer lugs engage the anvil lugs; wherein the collar is axially slidable between a first position, in which the engagement lugs are decoupled from the engagement recesses to thereby permit relative rotational movement between the collar and the hammer, and a second position in which the engagement lugs are coupled to the engagement recesses to thereby inhibit relative rotational movement between the collar and the hammer.