Abstract: A chuck for use with a manual or powered driver having a housing and a drive shaft rotatable with respect to the housing is provided. The chuck includes a generally cylindrical body having a forward section and a rearward section. The rearward section has an axial bore formed therein to mate with the drive shaft of the driver. A generally cylindrical sleeve is received over the body so that the sleeve is rotatable relative to the body. A gripping mechanism is actuatable to a closed position in which the gripping mechanism axially and rotationally retains a tool with respect to the body and to an open position in which the gripping mechanism does not so retain the tool. The gripping mechanism is in communication with the body and the sleeve so that relative rotation between the body and the sleeve actuates the gripping mechanism to one of the closed and open positions, depending on the direction of the relative rotation between the body and the sleeve.

Abstract: A harness to enable the wearer to carry an article such as breathing apparatus comprises a waist belt (9) carrying a waist plate (1) to which a back plate (21) is secured. The harness includes shoulder straps (20) and a coupling (41,50) for securing the article to it. The back plate (21) is moveable with respect to the waist plate (1) to facilitate movement of the wearer's body.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft is provided. The chuck includes a plurality of jaws slidably positioned in angularly disposed passageways in a body member. Each of the jaws has a jaw face formed on one side and threads formed on the other. A nut includes axially aligned threaded sections. Each of the sections is rotatably mounted on the body in engagement with the jaw threads. A generally cylindrical front sleeve member is in driving engagement with the nut whereby the jaws will be moved by the nut when the front sleeve member is rotated with respect to the body. The first section and the second section are rotated with respect to each other when the jaws are in a gripping engagement with a tool shaft.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft is provided. The chuck comprises a generally cylindrical body member. The body member has a forward section and a rearward section. The rearward section has an axial bore formed therein to mate with the drive shaft of the driver. A generally cylindrical sleeve is received over the forward section of the body. A primary retaining mechanism is in engagement with the sleeve and the body member to operatively prevent forward axial movement of the sleeve with respect to the body. A secondary retaining mechanism is attached to the sleeve so that if the primary retaining mechanism fails to prevent forward axial movement of the sleeve with respect to the body, the secondary retaining mechanism is brought to engagement with the body to prevent forward axial movement of the sleeve with respect to the body following the engagement.