Makita Corporation

Tomoro Aoyama

Kazuma Aoki

Takeshi Kamiya

Kazunori Kinoshita

An impact tool () includes: a motor () having a rotor () that is rotatable about a rotational axis (AX); a spindle () disposed forward of the stator and rotating when the rotor rotates; an anvil () having at least a portion disposed forward of the spindle and mounting a bit (); a hammer (), which rotatably impacts the anvil; and a housing (), which has a motor-housing part () that houses the motor. The maximum tightening torque is 140 N·m or more. Overall length (La), which is the distance—in the front-rear direction parallel to the rotational axis—between a rear-end portion of the motor-housing part and a front-end portion of the anvil, is 100 mm or less. The hammer has a base portion, a front-side ring portion protruding forward from the base portion, and hammer projection portions protruding radially inward from the front ring portion.

Impact tool

An impact tool () includes: a motor (); a spindle (), which is disposed forward of the motor and is rotated by the motor; a hammer (), which is supported by the spindle; an anvil (), which is impacted in a rotational direction by the hammer, a motor housing (), which houses the motor; a grip housing (), which extends downward from the motor housing; and a battery-holding housing (), which is disposed at a lower-end portion of the grip housing and holds a battery pack () having a rated voltage of 18 V. The distance (Da) between a rearward-most edge of the motor housing and a frontward-most edge of the anvil is 97 mm or less.

To reduce size increase, an impact tool includes a motor, a spindle located frontward from the motor, rotatable by the motor, and having a support hole extending rearward from a front end of the spindle, a hammer supported by the spindle, a ball between the spindle and the hammer, and an anvil received in the support hole and strikable by the hammer in a rotation direction. The anvil has a rear end located rearward from the ball.

To improve operability it is desireable to decrease the size of an impact tool. The impact tool includes a motor, a spindle including a spindle shaft and a flange. An anvil of the tool includes an anvil shaft and an anvil projection. A hammer of the tool includes a base surrounding the spindle shaft, a front ring protruding frontward from an outer circumference of the base, and a hammer projection to strike the anvil projection in a rotation direction. The base has a groove at a boundary with the hammer projection. One of ordinary skill in the art would appreciate that the arrangement disclosed herein results in space savings that allows for overall decrease in the size of an impact too.

An impact tool () includes: a motor () having a rotor () that is rotatable about a rotational axis (AX); a spindle () disposed forward of the stator and rotating when the rotor rotates; an anvil () having at least a portion disposed forward of the spindle and mounting a bit (); a hammer (), which rotatably impacts the anvil; and a housing (), which has a motor-housing part () that houses the motor. The maximum tightening torque is 140 N·m or more. Overall length (La), which is the distance—in the front-rear direction parallel to the rotational axis—between a rear-end portion of the motor-housing part and a front-end portion of the anvil, is 100 mm or less. Center height Hc, which is the distance in the up-down direction between the rotational axis and an upper-end portion of the motor-housing part, is 29 mm or less.

An impact tool has less size increase. An impact tool includes a motor, a spindle, an anvil including an anvil shaft and an anvil projection, a hammer including a hammer projection to strike the anvil projection in a rotation direction, a hammer case accommodating the hammer, an anvil bearing held in the hammer case and surrounding the anvil shaft, and a cup washer facing a front surface of the anvil projection. The cup washer includes an inner ring portion in contact with a rear end face of the anvil bearing, an outer ring portion surrounding the anvil bearing, and a connecting ring portion connecting an outer edge of the inner ring portion and an inner edge of the outer ring portion.

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Anjo, Japan

Tomoro Aoyama