Abstract: A rotary impact tool includes a housing, an electric motor, and a drive assembly for converting a continuous torque input from the motor to consecutive rotational impacts upon a workpiece of at least 900 ft-lbs of fastening torque. An anvil has a bore defining a hexagonal cross-sectional shape and having a nominal width of 7/16 inches. A hammer is rotationally and axially movable relative to the anvil for imparting the consecutive rotational impacts upon the anvil. A spring biases the hammer in an axial direction toward the anvil. A battery pack has a nominal voltage of at least 18 Volts and a nominal capacity of at least 5 Ah. The rotary impact tool has an overall weight including the battery pack that is less than or equal to 7.5 pounds. A ratio of the fastening torque to the overall weight is greater than or equal to 120 ft-lbs per pound.

Abstract: A rotary impact tool includes a housing, an electric motor, and a drive assembly for converting a continuous torque input from the motor to consecutive rotational impacts upon a workpiece of at least 900 ft-lbs of fastening torque. An anvil has a bore defining a hexagonal cross-sectional shape and having a nominal width of 7/16 inches. A hammer is rotationally and axially movable relative to the anvil for imparting the consecutive rotational impacts upon the anvil. A spring biases the hammer in an axial direction toward the anvil. A battery pack has a nominal voltage of at least 18 Volts and a nominal capacity of at least 5 Ah. The rotary impact tool has an overall weight including the battery pack that is less than or equal to 7.5 pounds. A ratio of the fastening torque to the overall weight is greater than or equal to 120 ft-lbs per pound.

Abstract: An impact tool head assembling mechanism is provided, including: an engaging sleeve, 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 which includes 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 a reference plane is defined as passing through the outermost peripheral edge and perpendicular to the axial direction, and an included angle between a line from the contact position to the outermost peripheral edge and the reference plane is between 25 and 65 degrees.

Abstract: The invention relates to a tool holder for an electric tool, particularly for a chisel hammer and/or drill hammer. A tool receptacle is provided for receiving a cylindrical shaft of an insertion tool introduced through an insertion opening. The cylindrical shaft has at least two diametrically opposed detent depressions on its circumferential surface. The tool holder further has a locking device having at least one locking element, at least one blocking element and at least one restoring element. According to the invention, the locking device has at least two locking elements. Upon insertion of the cylindrical shaft of the insertion tool, the restoring element applies different forces to the locking elements of the locking device.

Abstract: Connection of a bit with two balls is enabled while high operability of attachment and detachment of the bit is maintained. A pressing ring 23 is held at the advance position together with an operation sleeve 22 by a guide washer 24 forced by a coil spring 25. When the rear end of the bit is inserted into a tool holder 8, the balls 27, 27 that are rolled rearward by the contact of the rear end of the bit are pushed in between the pressing ring 23 and the guide washer 24 in order, and the balls 27, 27 can be retracted from the tool holder 8 in the state where the pressing ring 23 is held at the advance position by the tilt of the guide washer 24.

Abstract: Connection of a bit with two balls is enabled while high operability of attachment and detachment of the bit is maintained. A pressing ring 23 is held at the advance position together with an operation sleeve 22 by a guide washer 24 forced by a coil spring 25. When the rear end of the bit is inserted into a tool holder 8, the balls 27, 27 that are rolled rearward by the contact of the rear end of the bit are pushed in between the pressing ring 23 and the guide washer 24 in order, and the balls 27, 27 can be retracted from the tool holder 8 in the state where the pressing ring 23 is held at the advance position by the tilt of the guide washer 24.

Abstract: Connection of a bit with two balls is enabled while high operability of attachment and detachment of the bit is maintained. A pressing ring 23 is held at the advance position together with an operation sleeve 22 by a guide washer 24 forced by a coil spring 25. When the rear end of the bit is inserted into a tool holder 8, the balls 27, 27 that are rolled rearward by the contact of the rear end of the bit are pushed in between the pressing ring 23 and the guide washer 24 in order, and the balls 27, 27 can be retracted from the tool holder 8 in the state where the pressing ring 23 is held at the advance position by the tilt of the guide washer 24.

Abstract: It is an object of the invention to provide a technique in a power tool having a detachable bit holder for preventing a bit holder from being detached from the tool body even if unexpected external force is exerted on an operating member for lock release. A representative power tool includes a tool body, a single holder mounting portion. The holder mounting portion removably holds a bit holder selected from multiple kinds of bit holders for holding multiple kinds of tool bits in different manners. Each bit holder includes a cylindrical portion, a through hole formed through the cylindrical portion, an engaging member disposed within the through hole, a cylindrical operating member axially movably fitted on the cylindrical portion between a movement prevented position and a movement allowed position.

Abstract: A very easy-to-actuate, replaceable tool fitting is comprised in that at least one movably supported profiled body (15) on an output spindle (1) or on the tool fitting (11) of the hand-held power tool and at least one profiled recess (7) on the output spindle (1) or on the tool fitting (11) are shaped and situated in such a way that when the tool fitting (11) is slid onto the output spindle (1), the at least one profiled body (15) engages in detent fashion in the at least one profiled recess (7), achieving both an axial locking and a rotary driving of the tool fitting (11) in relation to the output spindle (1) and means (6, 8, 14) are provided, which, through a rotating and sliding motion of the tool fitting (11) on the output spindle (1), guide the profiled body (15) into the profiled recess (7).

Abstract: A hand power tool has a striking element via which a tool (10) in a tool holder (12) can be driven in striking fashion, which the tool holder can be detachably secured—via its body (14)—to a drive part (16) via at least one locking element (18), which the locking element, in its engaged position, is capable of being fixed in position radially by a retaining element (20), which the retaining element is capable of being automatically guided by means of an operating element (22) out of its locked position into a release position that radially releases the locking element (18) in order to release the tool holder (12), whereby the retaining element (20) is capable of being moved by a corresponding component (14) into its release position against a spring force of a spring element (24) when the tool holder (12) is pushed onto the drive part (18), wherein the retaining element (20) is captively held on the drive part (16) and is capable of being guided into its release position by the operating element (22) in the p

Abstract: A tool holder for a hand supported impacting machine, which tool holder is suitable for receiving a tool having a shank portion on which is formed a retaining collar. The tool holder includes a tubular main body for receiving the tool and at least one locking element moveably mounted with respect to the main body and having an engaging portion moveable between a radially inner locked position in which the engaging portion is engageable with the retaining collar of the tool and a radially outer unlocked position in which a tool can be inserted into or removed from the tool holder. The tool holder additionally comprises a manually actuable sleeve moveable between a locked position in which the locking elements are held in their locked position and an unlocked position in which the engaging portions of the locking elements are moveable to their unlocked position.

Abstract: An improved structure of hand tool comprising a first pipe, a second pipe, a rotating sleeve, a pushing member, a pushing axle-rod and a chuck, wherein: the first pipe has thereon a position-limiting slot and two positioning holes provided for extending therethrough of two position-limiting elements; the first pipe has thereon an elastic piece to abut against the position-limiting elements; the rotating sleeve is slipped over the first pipe and has thereon in opposition to the position-limiting slot a hole for extending of a pivotally-connecting element therein to connect and lock the pushing member, the hole has on the inner wall thereof a positioning groove to engage the position-limiting elements and to make positioning with the elastic piece; the pushing member is slipped over the pushing axle-rod which has a bearing thereon; and one end of the pushing axle-rod is brought to rotate by a driving element, the other end is pivotally connected with the chuck, and the hand tool is completed to be able of fast

Abstract: A tool holder for a rotary hammer or chisel hammer, comprising at least one locking element, a supporting ring axially movable between a position supporting the locking element in the locked position and a second position defining a first release position of the locking element and wherein the locking element comprising a shaped element which, on its radially outer side, has a single projection lying between a first recess formed at a front edge of the locking element and a second recess formed at a rear edge of the locking element and the supporting ring has on a radially inner side a single projection lying between a first recess formed at a front edge of the supporting ring and a second recess formed at a rear edge of the supporting ring.

Abstract: A chuck for a percussion hand-held power tool including a coupling sleeve (3) for receiving a working tool and having two diametrically opposite, slot-shaped, radial openings (4, 4′) in which two locking members (5) radially and axially displace a locking sleeve 6 surrounding the coupling sleeve (3) and the locking members (5), and a spring-biased push-sleeve (8) formlockingly cooperating with the locking members (5), with the locking members (5) being supported against the inner surface (7) of the locking sleeve (6), extending into an interior of the coupling sleeve (3), and having each a radial dimension greater than a thickness of the coupling sleeve wall and a width decreasing toward a chuck axis (A).

Abstract: A tool holder, for mounting a bit formed with a groove onto a power tool, includes a tool-holding tool, an engagement member, and a resilient member. The tool-holding tube defines a bit insertion hole that extends in an axial direction. The tool-holding tube is formed with an elongated hole that is in connection with the bit insertion hole and that extends in the axial direction. The engagement member is disposed in the elongated hole and partially protrudes into the bit insertion hole. The engagement member is movable, by abutment with and pressing force from the bit being inserted into the bit insertion hole, in the axial direction and, when located at a retraction position in the axial direction, also outward in a radial direction of the tool-holding tube. The resilient member is disposed to an outer periphery of the tool-holding tube at the retraction position.

Abstract: A chuck for receiving a tool shank of a boring tool and including radially displaceable engagement members (5) formlockingly engageable in the radial recesses (3) formed in the clamp region of the tool shank, an axially displaceable control sleeve (6) for radially displacing the engagement members between their engagement and release positions, and a resilient holding member (8) arranged between the control sleeve (6) and the clamp region of the tool shank and having a detent element (9) for preventing displacement of the control sleeve into its locking position (7) from its release position (10) into which the control sleeve was displaced upon insertion of the boring tool.

Abstract: A hand power tool has a tool holder with a base body; a drive part; at least one locking body for connecting the base body of the tool holder with the drive part; a securing body which radially fixes the at least one locking body in an engaging position; an actuating element operative for unlocking the tool holder and guiding the securing body to a position which radially releases the locking body, the base body in a locking position surrounding at least a part of the drive part.

Abstract: A tool holder, for mounting a bit formed with a groove onto a power tool, includes a tool-holding tool, an engagement member, and a resilient member. The tool-holding tube defines a bit insertion hole that extends in an axial direction. The tool-holding tube is formed with an elongated hole that is in connection with the bit insertion hole and that extends in the axial direction. The engagement member is disposed in the elongated hole and partially protrudes into the bit insertion hole. The engagement member is movable, by abutment with and pressing force from the bit being inserted into the bit insertion hole, in the axial direction and, when located at a retraction position in the axial direction, also outward in a radial direction of the tool-holding tube. The resilient member is disposed to an outer periphery of the tool-holding tube at the retraction position.

Abstract: A chuck for a percussion hand-held power tool including a coupling sleeve (3) for receiving a working tool and having two diametrically opposite, slot-shaped, radial openings (4, 4′) in which two locking members (5) radially and axially displace a locking sleeve 6 surrounding the coupling sleeve (3) and the locking members (5), and a spring-biased push-sleeve (8) formlockingly cooperating with the locking members (5), with the locking members (5) being supported against the inner surface (7) of the locking sleeve (6), extending into an interior of the coupling sleeve (3), and having each a radial dimension greater than a thickness of the coupling sleeve wall and a width decreasing toward a chuck axis (A).

Abstract: A tool-bit holding device in a percussion tool includes a rotatable and axially-movable retainer sleeve for accommodating a shank of a tool bit. A lock member supported by the retainer sleeve is movable radially with respect to the retainer sleeve. The lock member can engage the shank of the tool bit to limit axial movement of the tool bit. A small-diameter surface portion formed by an inner surface of a fixed front cover contacts the rock member and projects at least part of the lock member inward of the retainer sleeve to engage the lock member with the shank of the tool bit when the retainer sleeve is placed at an active position. A conic surface portion formed by the inner surface of the front cover is engageable with the lock member, and is able to variably limit radial movement of the lock member as the retainer sleeve moves axially.

Abstract: The machine tool, especially a hammer drill or chisel, has a rotatable and/or axially movable tool holder (10,12) for a tool (16) having a grooved shaft. The tool holder (10,12) includes a base body (22); two radially movable locking bodies (18,20) held in the base body and movable into respective locking positions engaged in two closed grooves (26,28) in the tool shaft; a bearing member (32) movable between a bearing position for holding the locking bodies (18,20) in the locking position and a releasing position in which the locking bodies are movable out of the grooves; an operating member (36,38) connected with the bearing member (32) for moving the bearing member (32) and a resilient plastic guiding member (42,44) arranged to guide the locking bodies (18,20) radially outward during motion from the locking to unlocking position and to act on the locking bodies (18,20) with a radially inwardly directed spring force.

Abstract: A tool holder for a rotary hammer or chisel hammer, comprising at least one locking element, a supporting ring axially movable between a position supporting the locking element in the locked position and a second position defining a first release position of the locking element and wherein the locking element comprising a shaped element which, on its radially outer side, has a single projection lying between a first recess formed at a front edge of the locking element and a second recess formed at a rear edge of the locking element and the supporting ring has on a radially inner side a single projection lying between a first recess formed at a front edge of the supporting ring and a second recess formed at a rear edge of the supporting ring.

Abstract: A chuck for receiving a tool shank of a boring tool and including radially displaceable engagement members (5) formlockingly engageable in the radial recesses (3) formed in the clamp region of the tool shank, an axially displaceable control sleeve (6) for radially displacing the engagement members between their engagement and release positions, and a resilient holding member (8) arranged between the control sleeve (6) and the clamp region of the tool shank and having a detent element (9) for preventing displacement of the control sleeve into its locking position (7) from its release position (10) into which the control sleeve was displaced upon insertion of the boring tool.

Abstract: A hand power tool has a tool holder with a base body; a drive part; at least one locking body for connecting the base body of the tool holder with the drive part; a securing body which radially fixes the at least one locking body in an engaging position; an actuating element operative for unlocking the tool holder and guiding the securing body to a position which radially releases the locking body, the base body in a locking position surrounding at least a part of the drive part.

Abstract: The machine tool, especially a hammer drill or chisel, has a rotatable and/or axially movable tool holder (10,12) for a tool (16) having a grooved shaft. The tool holder (10,12) includes a base body (22); two radially movable locking bodies (18,20) held in the base body and movable into respective locking positions engaged in two closed grooves (26,28) in the tool shaft; a bearing member (32) movable between a bearing position for holding the locking bodies (18,20) in the locking position and a releasing position in which the locking bodies are movable out of the grooves; an operating member (36,38) connected with the bearing member (32) for moving the bearing member (32) and a resilient plastic guiding member (42,44) arranged to guide the locking bodies (18,20) radially outward during motion from the locking to unlocking position and to act on the locking bodies (18,20) with a radially inwardly directed spring force.

Abstract: A tool-bit holding device in a percussion tool includes a rotatable and axially-movable retainer sleeve for accommodating a shank of a tool bit. A lock member supported by the retainer sleeve is movable radially with respect to the retainer sleeve. The lock member can engage the shank of the tool bit to limit axial movement of the tool bit. A small-diameter surface portion formed by an inner surface of a fixed front cover contacts the rock member and projects at least part of the lock member inward of the retainer sleeve to engage the lock member with the shank of the tool bit when the retainer sleeve is placed at an active position. A conic surface portion formed by the inner surface of the front cover is engageable with the lock member, and is able to variably limit radial movement of the lock member as the retainer sleeve moves axially.

Abstract: An improved structure of multi-functional hand tool, wherein, a pushing axle rod is screw connected with a chuck, a pushing axle rod is screw connected with a driving rod; bearings are slipped over a positioning sleeve, then the positioning sleeve, the pushing axle rod and the chuck are together placed in a pipe body with the bearings. The positioning sleeve can be rotated in the bearings. A front cover is locked in the front end of the pipe body; the chuck is extended out of the front cover. The pushing member is screwed in the pipe body to render a hole on a rear enlarged threaded portion of the pushing member to be exactly located at a position limiting slot of the pipe body. The external sleeve then is slipped over the pipe body, and an inner screw hole of the external sleeve is aligned with the position limiting slot of the pipe body. Then the positioning screw rod is screwed in the inner screw hole to extend through the position limiting slot and the hole of the pushing member.

Abstract: A tool holder for coupling of rotating and striking tools with hand power tools has a coupling sleeve, a drive member connectable to a hand power tool and transmitting a drive movement, the coupling sleeve being connected with the drive member, a tool shaft provided with groove-shaped locking pockets which are closed at both sides in an axial direction, the coupling sleeve being connected with the tool shaft, elongated locking bodies which are oriented axis-parallel and engage in the locking pockets, the coupling sleeve having a longitudinal passage in which each of the locking bodies are axially displaceable and held radially immovable, a displacement sleeve which surrounds the coupling sleeve with the locking bodies and is spring-loaded in an axial direction, the displacement sleeve having an inner blocking surface which blocks a radial movement of the locking bodies, each of the locking bodies has a construction which is saddle-shaped in a longitudinal section and has two humps which have an arcuate cross-

Abstract: A tool for hand-held equipment and including a shank (2; 22; 32) with a clamping region (3; 23; 33) having a diameter (t) equal to or greater than 12 mm, at least one locking groove (4; 24; 34) provided in the clamping region (3; 23, 33), and at least one drive groove (6; 26; 36) provided in the clamping region (3; 23; 33), with the at least one locking groove (4; 24; 34) and the at least one drive groove (6; 26; 36) having each a depth (v; d) equal to or greater than 2.5 mm and opposite edges (8; 9) lying on a shank circumference, and forming with each other, an aperture angle (&agr;; &bgr;) equal to or greater than 50°.