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US 12,734,651 B2Granted
Impact tool
AssigneeMakita Corporation
InventorYasuhito Kawai
Life of this patent
Estimating the term…
Abstract
An impact tool (1) includes: a motor (6) supplied with a voltage of 18 V or more; a spindle (8) rotated by the motor; a spindle groove (8D) formed in the spindle; a ball (48) held in the spindle groove; a hammer (47) supported on the spindle via the ball; a spring (49, 50), which biases the hammer forward; and an anvil (10) configured to be impacted in a rotational direction by the hammer. An impact-start torque, which is the torque acting on the anvil when the hammer starts to impact the anvil, is 1,100 N·mm or less.
Claims19
An impact tool comprising:
- a motor supplied with a voltage of 18 V or more;
- a spindle rotated by the motor;
- a spindle groove formed in the spindle;
- a ball held in the spindle groove;
- a hammer supported on the spindle via the ball;
- at least one spring, which biases the hammer forward;
- and
- an anvil configured to be impacted in a rotational direction by the hammer;
- wherein an impact-start torque, which acts on the anvil when the hammer starts to impact the anvil, is 1,100 N·mm or less;
- a maximum fastening torque of the impact tool is higher than 200 N·m;
- and
- a value calculated by dividing the maximum fastening torque (N·m) by the impact-start torque (N·mm) is greater than 165.
9 more elements
An impact tool comprising:
- a motor;
- a spindle rotated by the motor;
- a spindle groove formed in the spindle;
- a ball held in the spindle groove;
- a hammer having a hammer groove, in which at least a portion of the ball is disposed, the hammer being supported on the spindle via the ball;
- at least one spring, which biases the hammer forward;
- and
- an anvil configured to be impacted in a rotational direction by the hammer;
- wherein an angle formed between a tangent vector and a load vector is 50° or less when a maximum-stroke time is defined as a point in time at which the hammer has moved most rearward relative to the spindle, the tangent vector being defined as having a direction parallel to a tangent of a circle about a rotational axis of the spindle and through a contact point between the ball and the hammer groove, and the load vector being defined as having a direction in which a load is transmitted from the ball to the contact point with the hammer.
6 more elements
An impact tool comprising:
- a motor supplied with a voltage of 18 V or more;
- a spindle rotated by the motor;
- a spindle groove formed in the spindle;
- a ball held in the spindle groove;
- a hammer supported on the spindle via the ball;
- at least one spring, which biases the hammer forward;
- and
- an anvil configured to be impacted in a rotational direction by the hammer;
- wherein:
- a maximum fastening torque of the impact tool is higher than 220 N·m;
- the impact-start torque, which acts on the anvil when the hammer starts to impact the anvil, is 1,300 N·mm or less;
- and
- a value calculated by dividing the maximum fastening torque (N·mm) by the impact-start torque (N·mm) is greater than 180.
10 more elements
An impact tool comprising:
- a motor;
- a spindle rotated by the motor,
- a cam element that includes a spindle groove, which is formed in the spindle, and a ball, which is held in the spindle groove;
- a hammer supported on the spindle via the ball;
- at least one spring element, which biases the hammer forward with a biasing force;
- and
- an anvil configured to be impacted in a rotational direction by the hammer;
- wherein:
- the impact tool is configured such that, at an impact time, the hammer resists the biasing force of the at least one spring element owing to rotational torque from the motor imparted thereto via the spindle and the cam element and, after having moved rearward while rotating, advances while rotating owing to the biasing force of the at least one spring element, which was compressed, and the cam element;
- and
- the cam element and the at least one spring element are each configured to nonlinearly increase a required torque, which is needed to rotate the hammer, to suppress an increase in the required torque in a first region in which a rearward stroke of the hammer is shorter, and to boost the increase in the required torque in a second region in which the hammer has a longer stroke.
8 more elements
Dependencies are inferred from the claim text.