A hand-held knockout driver includes a main housing having a handle portion, a motor positioned within the main housing, a pump assembly driven by the motor, and a secondary housing coupled to the main housing and defining a bore therein. The hand-held knockout driver also includes a working piston moveable within the bore from a rest position to an actuated position to define a piston throw distance therebetween. The hand-held knockout driver also includes a draw stud coupled to the working piston, a die coupled to the secondary housing, and a punch coupled to the draw stud opposite the working piston for movement therewith relative to the die. The die has a depth greater than the piston throw distance.

An assembly includes a first punching jaw, a second punching jaw pivotally connected to the first punching jaw, a punching stamp provided on one of the punching jaws and a punching opening provided on the other of the punching jaws, and a handheld apparatus connected to the jaws. When said handheld apparatus is actuated, the first ends of the jaws move toward each other to effect a punching process.

An assembly includes a first punching jaw, a second punching jaw pivotally connected to the first punching jaw, a punching stamp provided on one of the punching jaws and a punching opening provided on the other of the punching jaws, and a handheld apparatus connected to the jaws. When said handheld apparatus is actuated, the first ends of the jaws move toward each other to effect a punching process.

A hand-held knockout punch driver includes a housing, a motor positioned within the housing, and a head unit removably coupled to the housing. The head unit includes a draw rod to which at least one of a punch or a die is attachable.

A hand-held knockout punch driver includes a housing, a motor positioned within the housing, and a head unit removably coupled to the housing. The head unit includes a draw rod to which at least one of a punch or a die is attachable.

A punch set for use with a punch tool to punch material from a wall of an electrical box. The punch set has a punch with a cutting section, and a die defining a cavity that is configured to receive the cutting section. The cutting section may have an annular or circular portion and a plurality of keyway forming portions each extending radially from the annular or circular portion. The cutting section of the punch may be insertable into the cavity of the die in a single orientation. The die may have a protrusion receivable within a recess of the punch when the cutting section is received in the cavity. One of the die or punch may have an extension that is receivable in a single orientation within an opening in the other of the die or punch.

A power tool includes a tool element extending from a housing, an electric motor disposed within the housing, a switch actuatable to energize the electric motor, an eccentric drive coupled to the electric motor and configured to convert a rotational input from the motor into a reciprocating motion of the tool element, and a controller configured to control operation of the electric motor. The electric motor is operable in a first mode to rotate in a first direction and in a second mode to rotate in a second direction opposite the first direction. The eccentric drive is configured to reciprocate the tool element when the electric motor is operated in the first mode and when the electric motor is operated in the second mode. The controller is configured to control the electric motor to alternate between the first mode and the second mode with each actuation of the switch.

A hand-held knockout driver includes a main housing having a handle portion, a motor positioned within the main housing, a hydraulic assembly driven by the motor and including a reservoir containing hydraulic fluid, a secondary housing coupled to the main housing and defining a bore therein, a working piston moveable within the bore between a rest position and an actuated position, and a work zone defined between the secondary housing and the working piston into which pressurized hydraulic fluid discharged from the hydraulic assembly is received. One unit of fluid is added to the work zone to move the working piston from the rest position to the actuated position. The reservoir has a fill capacity no greater than about 1.5 units of fluid.

A hand-held knockout driver includes a main housing having a handle portion, a motor positioned within the main housing, a hydraulic assembly driven by the motor and including a reservoir containing hydraulic fluid, a secondary housing coupled to the main housing and defining a bore therein, a working piston moveable within the bore between a rest position and an actuated position, and a work zone defined between the secondary housing and the working piston into which pressurized hydraulic fluid discharged from the hydraulic assembly is received. One unit of fluid is added to the work zone to move the working piston from the rest position to the actuated position. The reservoir has a fill capacity no greater than about 1.5 units of fluid.

The invention relates to a hydraulically actuated piston (9) guided in a cylinder (8), and to a hydraulic working tool (1) having a working head (2), wherein the piston (9) has an impact surface (15) which borders an impact space (16) on the piston side provided between the piston (9) and the cylinder (8), and wherein hydraulic fluid (17) can act on the impact surface (15) by increasing the impact space (16) in order to move the piston (9) in an impact direction (r), and the piston (9) forms a limiting device (25) for a through-flow of the hydraulic fluid (17). According to the invention, in order to design a hydraulic piston guided in a cylinder or a hydraulic working tool in such a way that no undue signs of wear occur even during working processes with the sudden disappearance of the counter pressure, a hydraulic chamber (19) filled with the hydraulic fluid (17) is formed in the impact direction (r) after the limiting device (25), wherein a volume of the hydraulic chamber (19) is reduced according to the increase in the impact space (16), by means of the displacement of hydraulic fluid (17) out of the hydraulic chamber (19) and into the impact space (16) via the limiting device (25).