Patent ID: 8869659
Filing Date: 2014-10-28
Classification: B25B,B25G

Abstract:
1. A hand tool comprising: a straight shank having a mounting portion defined in a first end thereof and multiple annular grooves defined in an outer periphery of the shank; a sleeve having a chamber defined therein, an opening and a through hole respectively defined two ends of the sleeve and communicating with the chamber, the through hole being defined by an annular wall extending inward and radially from an inner periphery of the sleeve, a contact shoulder being formed at a conjunction portion between the annular wall and an inner periphery of the chamber, a first connection portion defined in an inner periphery of the opening; a control member located in the chamber and having a first cylindrical space, a second cylindrical space and a third cylindrical space defined in an inner periphery of the control member, the first, second and third cylindrical spaces communicating with each other, a diameter of the second cylindrical space being larger than that of the first cylindrical space, a diameter of the third cylindrical space being smaller than that of the first cylindrical space, a first tubular portion extending from an end of the control member, a diameter of the first tubular portion being smaller than that of the control member, the first tubular portion rotatably extending through the through hole and having a fourth cylindrical space defined therein, the third cylindrical space communicating with the fourth cylindrical space in the first tubular portion, a diameter of the fourth cylindrical space being smaller than that of the third cylindrical space, the shank extending through the first tubular portion and a second connection portion defined in an outer periphery of a distal end of the first tubular portion; a pressing member being a ring and having a third connection portion defined in an inner periphery thereof, the pressing member connected to the second connection portion by the third connection portion, a gap defined between the pressing member and the sleeve; a resilient member located in the chamber and a first end of the resilient member biased against the control member which contacts the contact shoulder, the first tubular portion extending through the sleeve via the through hole; an end piece having a fourth connection portion defined in an outer periphery of a mediate portion thereof, the fourth connection portion connected with the first connection portion to connect the end piece to the sleeve, the end piece having a second tubular portion extending from an end thereof and an outer diameter of the second tubular portion being smaller than that of the end piece, the second tubular portion rotatably extending through the third cylindrical space, at least one tapered recess defined through a wall of the second tubular portion, the end piece having a fifth cylindrical space defined therethrough through which the shank extends, the at least one tapered recess communicating with the fifth cylindrical space, a second end of the resilient member biased against the end piece, and at least one bead engaged with the at least one recess; when the control member is biased by the resilient member, the at least one bead contacts an inner peripheral wall of the first cylindrical space