Patent ID: 6024180
Filing Date: 2000-02-15
Classification: B25B

Abstract:
A cage device for a pneumatically driven power tool which includes:a housing;an air motor with a drive output shaft rotatably mounted in the housing about a first axis;a power output shaft mounted on the housing for rotation and axially spaced apart from the drive output shaft;an impact receiving anvil jaw extending outwardly and radially from the power output shaft;an annular hammer member disposed to surround and to be angularly movable relative to the power output shaft, and including:an inner annular wall with a clockwise impact jaw thereon to intermittently engage and disengage the impact receiving anvil jaw so as to enable an instant impact on the impact receiving anvil jaw once the annular hammer member has completed a predetermined angular displacement relative to the power output shaft around a second axis parallel to the first axis while the inner annular wall is released from the engagement with the impact receiving anvil jaw, andan outer annular wall opposite to the inner annular wall in a radial direction, and defining a longitudinal groove therein which extends in a first longitudinal direction parallel to the first axis, and a limiting notch therein which is diametrically opposite to the longitudinal groove and which extends angularly and in the first longitudinal direction,said cage device comprising:front and rear end plates respectively provided with front and rear major walls, and disposed to be spaced apart from each other in a second longitudinal direction with said front and rear major walls opposite to each other, said rear major wall being adapted to be in a splined connection with and to be driven by the drive output shaft to rotate about the first axis, and defining a pair of first pin holes which are diametrically spaced apart from each other relative to the first axis and which respectively extend in the second longitudinal direction, said front major wall defining an inserting hole adapted to be rotatably sleeved on the power output shaft, and a pair of second pin holes which are diametrically spaced apart from each other relative to said inserting hole; andopposite tilt and limit pins provided with two first secured ends and two second secured ends respectively, each of said first secured ends and each of said second secured ends being disposed to be inserted into and being in tight connection with, in the second longitudinal direction, one of a pair of said first and second pin holes, and a corresponding one of the other pair of said first and second pin holes respectively so as to define a space therein, said space being adapted to accommodate the impact receiving anvil jaw and the annular hammer member with the first longitudinal direction parallel to the second longitudinal direction, said tilt pin being adapted to be received in the longitudinal groove to form a tilting axis parallel to the first axis such that the annular hammer member is retainingly pivotable relative to said tilt pin to swing about the tilting axis, said limit pin being adapted to be received in and in slidable contact with the limiting notch so as to limit swinging extent of the annular hammer member in order to enable said rear major wall to drive the annular hammer member to rotate relative to the power output shaft, thereby bringing the clockwise anvil jaw to exert the instant impact on the impact receiving anvil jaw.