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US 8,939,228 B2Granted
Percussion driver drill
AssigneeMakita Corporation
InventorTomoyuki Kondo
Life of this patent
Estimating the term…
Abstract
In a clutch mechanism of a percussion driver drill, a plurality of engageable members held in a gear case is configured to be engageable with an end face of a final-stage internal gear, and a coil spring is configured to press the engageable members against the end face of the internal gear. The coil spring is disposed frontwardly of the engageable members between a switch member and an operating member of a vibration mechanism. A coupling member connected with the switch member and the operating member is disposed to pass through a gap between the plurality of engageable members and detour around a rear end of the coil spring.
Claims20
A percussion driver drill comprising:
- a housing;
- a motor provided in the housing;
- a gear case provided in the housing, the gear case having a tubular portion protruding frontward;
- a planetary gear speed reduction mechanism provided in the gear case;
- a spindle rotatably supported in the tubular portion of the gear case, the spindle being configured to protrude from the housing and to receive an output of the motor transmitted through the planetary gear speed reduction mechanism;
- a clutch mechanism including a final-stage internal gear rotatably provided at a final stage of the planetary gear speed reduction mechanism, a plurality of engageable members held in the gear case and configured to be engageable with an end face of the internal gear, and a coil spring disposed frontwardly of the plurality of engageable members and configured to press the plurality of engageable members against the end face of the internal gear, the clutch mechanism being configured to cause the internal gear to run idle, thereby interrupting transmission of torque, at overload beyond a pressing force of the coil spring;
- a cam mechanism provided inside the tubular portion and configured to selectively impart an axial vibratory motion to the spindle;
- and
- a vibration mechanism including a switch member provided outside the tubular portion and configured to be rotatable to a first angular position in which the switch member is interlocked with the cam mechanism to render the cam mechanism operable and a second angular position in which the switch member is released from the cam mechanism to render the cam mechanism inoperable, a coupling member connected with the switch member, and an operating member provided outside the switch member in a radial direction of the tubular portion, connected with the coupling member to establish connection with the switch member, and configured to be operable to rotate the switch member into one of the first and second angular positions, whereby a rotatory motion of the switch member to the first angular position imparted through the operating member makes the cam mechanism capable of imparting the axial vibratory motion to the spindle,
- wherein the coil spring of the clutch mechanism is disposed between the switch member and the operating member of the vibration mechanism, and the coupling member is disposed to pass through a gap between the plurality of engageable members and detour around a rear end of the coil spring.
7 more elements
A drill comprising:
- a housing;
- a motor provided in the housing;
- a spindle configured to protrude from the housing and to receive a rotary output from the motor causing the spindle to rotate about an axis;
- a clutch mechanism configured to interrupt transmission of an overload torque between the motor and the spindle;
- and
- a vibration mechanism including:
- a switch member configured to be rotatable to a first angular position in which the switch member activates axial vibratory motion on the spindle, and a second angular position in which the switch member does not activate axial vibratory motion on the spindle;
- a coupling member connected with the switch member;
- and
- an operating member provided outside the switch member in a radial direction from the axis, the operating member connected with the coupling member to establish connection with the switch member, and configured to be operable to rotate the switch member into one of the first and second angular positions, whereby a rotatory motion of the switch member to the first angular position imparted through the operating member activates the axial vibratory motion on the spindle,
- wherein a portion of the clutch mechanism is disposed between the switch member and the operating member of the vibration mechanism.
8 more elements
A drill comprising:
- a housing;
- a motor provided in the housing;
- a spindle configured to protrude from the housing and to receive a rotary output from the motor causing the spindle to rotate about an axis;
- a clutch mechanism configured to interrupt transmission of an overload torque between the motor and the spindle;
- and
- a vibration mechanism including:
- a switch member configured to be rotatable to a first angular position in which the switch member activates axial vibratory motion on the spindle, and a second angular position in which the switch member does not activate axial vibratory motion on the spindle;
- a coupling member connected with the switch member, the coupling member configured with first and second arms extending in a direction perpendicular to the axis, and a base member extending in a radial direction to the axis, the base member connecting the first and second arms, whereby one of the first and second arms is connected to the switch member;
- and
- an operating member provided outside the switch member in a radial direction from the axis, the operating member connected with the coupling member by the other of the first and second arms so as to establish connection with the switch member, the operating member configured to be operable to rotate the switch member into one of the first and second angular positions, whereby a rotatory motion of the switch member to the first angular position imparted through the operating member activates the axial vibratory motion on the spindle,
- wherein a portion of the clutch mechanism is disposed between the switch member and the operating member of the vibration mechanism.
8 more elements
Dependencies are inferred from the claim text.