Power tool and mechanism
First Claim
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1. A power tool comprising:
- a housing;
a motor mounted in the housing and having an output shaft;
an epicyclic gearbox mounted in the housing and having an input end mounted on the motor and an output end;
an aperture in the housing, said output end of the gearbox being adjacent said aperture;
a drive spindle and a torque control ring of the gearbox, which control ring, when held stationary relative to the gearbox, permits the gearbox to transmit torque to said drive spindle and which, when permitted to rotate in said gearbox, disables said torque transmission;
an application mechanism including an actuator engaged with, and resiliently biassed towards, said torque control ring, and an adjustment element displaceable on said application mechanism to adjust the engagement of said actuator with said torque control ring;
a chuck shaft driven by said drive spindle;
a hammer mechanism engaged with said drive spindle and adapted to impart a superimposed oscillatory motion on the drive spindle and to said chuck shaft, said hammer mechanism including an engagement element, which engagement element in a first one position thereof enables said hammer mechanism and in a second position thereof disables said hammer mechanism; and
a nose ring rotatable on said housing about said aperture thereof which actuates both said adjustment element of the application mechanism and said engagement element of said hammer mechanism.
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Abstract
A power tool has an application mechanism (300) for connection to the output of an epicyclic gearbox provided with a torque control ring. The mechanism has a body (310) journalling a chuck spindle (302). Outside the body is a clutch control arrangement comprising balls (334,336) pressed against the torque control ring by individual springs (330) controlled by a control ring (322) threaded on the body. The mechanism includes a hammer arrangement having rotary and fixed ratchet plates (378,376) and cam ring (308) operable to engage and separate the plates by a lever (360) which projects between the springs (330).
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Citations
12 Claims
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1. A power tool comprising:
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a housing; a motor mounted in the housing and having an output shaft; an epicyclic gearbox mounted in the housing and having an input end mounted on the motor and an output end; an aperture in the housing, said output end of the gearbox being adjacent said aperture; a drive spindle and a torque control ring of the gearbox, which control ring, when held stationary relative to the gearbox, permits the gearbox to transmit torque to said drive spindle and which, when permitted to rotate in said gearbox, disables said torque transmission; an application mechanism including an actuator engaged with, and resiliently biassed towards, said torque control ring, and an adjustment element displaceable on said application mechanism to adjust the engagement of said actuator with said torque control ring; a chuck shaft driven by said drive spindle; a hammer mechanism engaged with said drive spindle and adapted to impart a superimposed oscillatory motion on the drive spindle and to said chuck shaft, said hammer mechanism including an engagement element, which engagement element in a first one position thereof enables said hammer mechanism and in a second position thereof disables said hammer mechanism; and a nose ring rotatable on said housing about said aperture thereof which actuates both said adjustment element of the application mechanism and said engagement element of said hammer mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power tool comprising:
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a housing; a motor in the housing; a gearbox in the housing connected to the motor; a rotary output spindle, driven by the gearbox; a torque control mechanism, to control adjustably the torque output of the gearbox and thereby the torque applied to said output spindle; and a hammer mechanism, selectively enabled to impart axial oscillations on said output spindle; a nose ring rotatably mounted on said housing about said mechanisms and for adjusting the torque control mechanism and enable the hammer mechanism.
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Specification