Abstract: The present disclosure relates to a power tool combination and a synchronization control device thereof including a first power tool, a second power tool, a signal receiving device electrically connected to the first power tool and a signal transmitting device electrically connected to the second power tool. The signal receiving device has a power switch for controlling the first power tool. The first aid second power tool are synchronously powered-on or powered-off via signal transmission and the signal transmitting device and the signal receiving device form independent circuits with the first and second power tools respectively. This makes the power of the power tool combination unlimited by the current capacity of the inlet wires of the power tools and lowers manufacturing costs.

Abstract: The present invention relates to a power miter saw with a quick actuating mechanism for a movable guard. The mechanism comprises a mounting arm, a fixed guard, a drive means and a circular saw blade. A movable guard is pivotally connected to the fixed guard. The movable guard is pivotally connected to the front end of the actuating link by a second guiding member. The rear end of the actuating link is movably connected to the mounting arm. A first guiding member is disposed on the rear end of the actuating link and the mounting arm has a first arcuate slide slot with which the first guiding member engages. When the fixed guard moves together with the saw unit downwardly, the actuating link pivotally engages the first slide slot and actuates the movable guard rapidly to open. The movable guard of the present invention can be easily manufactured and conveniently assembled or adjusted so as to reduce the cost.

Abstract: The present invention relates to a power drill which comprises a spindle and a rear bearing mounted on the rear portion of the spindle. A fixed gear wheel is connected to a gearbox and a movable gear wheel is connected to the spindle. An adjustment member is provided on the front portion of the spindle. The adjustment member comprises an adjustment cover, an adjustment fork connected to the adjustment cover and a sleeve connected to the adjustment fork and mounted on the front end of the spindle. On the sleeve is provided a groove. A stroke adjustment member on which is provided a protruding block is disposed between the movable gear wheel and the sleeve. A stopper whose radial dimension is greater than the spindle is disposed on the front portion of the spindle. A plane bearing is disposed between the front end of the sleeve and the rear end of the stopper and is provided with a retainer for receiving a rolling element.

Abstract: The present invention relates to a quick actuating mechanism for a movable guard of miter saw, the mechanism comprises: a mounting arm 7, a fixed guard 3, a drive means and a circular saw blade 6, a movable guard 5 is pivotally connected to the fixed guard 3, the movable guard 5 is pivotally connected to the front end of the actuating link 2 by a second pin 4, the rear end of the actuating link 2 is movably connected to the mounting arm 7, a first pin 1 is disposed on the rear end of the actuating link 2, the mounting arm 7 has a first arcual slide slot 8 with which the first pin 1 engages. When the fixed guard moves together with a saw unit of the miter saw downwardly, the actuating link pivotally engages with the first slide slot and actuates the movable guard rapidly to open. The present design of the movable guard of a miter saw can be easily manufactured and conveniently assembled or adjusted so as to the cost reduced.

Abstract: The present invention relates to a power drill which comprises a spindle and a rear bearing mounted on the rear portion of the spindle. A fixed gear wheel is connected to a gearbox and a movable gear wheel is connected to the spindle. An adjustment member is provided on the front portion of the spindle. The adjustment member comprises an adjustment cover, an adjustment fork connected to the adjustment cover and a sleeve connected to the adjustment fork and mounted on the front end of the spindle. On the sleeve is provided a groove. A stroke adjustment member on which is provided a protruding block is disposed between the movable gear wheel and the sleeve. A stopper whose radial dimension is greater than the spindle is disposed on the front portion of the spindle. A plane bearing is disposed between the front end of the sleeve and the rear end of the stopper and is provided with a retainer for receiving a rolling element.