A percussion tool is used for performing a chiseling operation on a workpiece with a chisel. The percussion tool comprises a housing including a cylinder portion, a tool holder coupled to the cylinder portion for holding the chisel, and a percussion mechanism including a striker supported for reciprocation in the cylinder portion. The percussion mechanism is configured to impart repeated axial impacts to the chisel with the striker. The percussion tool further comprises a flange between the cylinder portion and the tool holder. Movement of the chisel within the tool holder toward the percussion mechanism is stopped by the flange.

A pneumatic hammer has a handle, a body, a valve seat, a cylinder device, an assembling device, and a chisel. The body is transversally connected to the handle and has a chamber. The valve seat is mounted in the chamber of the body and has a rear valve, a front valve, and a valve plate disposed between the rear valve and the front valve. The cylinder device is mounted in the chamber, abuts against the valve seat, and has a cylinder barrel and a hammer. The cylinder barrel is mounted in the chamber and has a cylinder chamber. The hammer is movably disposed in the cylinder chamber. The assembling device is connected to the cylinder device, and has a mounting jacket, an engaging element, multiple positioning elements, a spring, and an engaging ring. The chisel is detachably connected to the assembling device, and is inserted into the cylinder chamber.

An impact tool head assembling mechanism is provided, including: an engaging sleeve, being disposed on a front end of an impact tool, including a tubular wall and at least one projection, the tubular wall defining an axial direction, the at least one projection being protrudingly and retractably disposed on an inner wall of the tubular wall; an impact tool head, including a rod body and a flange radially protruding from the rod body, the flange including an inclined surface facing toward the front end and an outermost peripheral edge, a contact position being defined as a position where the inclined surface contact with the at least one projection; wherein as viewed along the axial direction, a distance between the contact position and the outermost peripheral edge is larger than or equal to 0.5 mm.

An impact tool head assembling mechanism is provided, including: an engaging sleeve, being disposed on a front end of an impact tool, including a tubular wall and at least one projection, the tubular wall defining an axial direction, the at least one projection being protrudingly and retractably disposed on an inner wall of the tubular wall; an impact tool head, including a rod body and a flange radially protruding from the rod body, the flange including an inclined surface facing toward the front end and an outermost peripheral edge, a contact position being defined as a position where the inclined surface contact with the at least one projection; wherein as viewed along the axial direction, a distance between the contact position and the outermost peripheral edge is larger than or equal to 0.5 mm.

A drilling tool configured to operate in two drilling modes, respectively with and without hammer action, said tool comprising a front end equipped with a rotating part for mounting a drill bit by way of an SDS-type push-fitting, characterized in that said rotating part comprises mechanism for the removable attachment to a first longitudinal end of a tubular extension, this tubular extension being configured to extend along and around a drill bit mounted in the rotating part and comprising a second longitudinal end configured to bear at least one screw-driving element, such that the tool can be used for a screw-driving operation even when it is equipped with the drill bit.

A drill apparatus including an inner tube, an outer tube slidably received within the outer tube, and a pole extension mechanism. The pole extension mechanism comprises a pole advance gear having pole advance gear teeth, and a drive gear having drive gear teeth, the drive gear being coaxial with and fixedly attached to the pole advance gear so that the two gears rotate together. The pole advance gear teeth are received in aligned spaced apart apertures in the outer tube. The pole extension mechanism further includes a lever arm having an end pivotally mounted on the support collar at a lever arm pivot point coaxial with the drive gear and the pole advance gear. The pole extension mechanism further includes a stop pawl pivotally mounted on the support collar for rotation between where the stop pawl engages the drive gear and prevents downward movement of the pole inner tube relative to the pole outer tube, and where the stop pawl does not engage the drive gear, and a drive pawl piece pivotally mounted on the lever arm near the lever arm end.

A remote demolition robot (10) comprising a controller (17), drive means (14), an arm member (11) movably arranged on a tower (10a) rotatably arranged on a body (11b) of the remote demolition robot (10) and a remote control (22) for providing commands, that are interpreted by the controller (17) causing the controller (17) to control the operation of the remote demolition robot (10), wherein the remote control (22) comprises a first joystick (24a) and a second joystick (24b), wherein the remote control (22) is characterized in that each joystick (24) is provided with a thumb control switch (26).

A multi-stroke powered safety hammer system includes a hammer having a body, a cylinder within the body, and a piston carried in the cylinder for reciprocal movement therein. The system includes a quick-connect coupling mount on the hammer, the mount having an inner barrel bounding a hollow interior, an outer sleeve for sliding movement over the inner barrel, and an engagement assembly defined by the inner barrel and the outer sleeve for locking an attachment in the interior. The system includes one of many attachments with an engagement portion; when the engagement portion is applied to the quick-connect coupling mount and the hammer is operated, the piston reciprocates to impact the engagement portion. The attachments guide fasteners, remove fasteners, and process materials.

A method employing an apparatus in conjunction with a hammer-drill to penetrate composite metal and non-metal structure or structures including, for example, thick metal or rebar encountered during concrete, rock or masonry boring operations without requiring a change in drill equipment.

A rotary hammer drill adapter. The rotary hammer drill adapter includes an elongated body having a shank end and a bit end. The bit end is disposed on an opposing end of the elongated body relative to the shank end. The shank end has a plurality of grooves disposed on opposing sides of the elongated body and a plurality of sliding keyways disposed on opposing sides of the elongated body. Each of the plurality of sliding keyways is disposed between a pair of the plurality of grooves. The bit end further includes an interface which is adapted to receive complementary bits.