Abstract: A hand-operated electric tool, especially a jigsaw, has a motor unit provided in the tool housing. The motor unit contains in a motor housing the stator and the rotor. One end of the rotor shaft projects from the motor housing and is mounted in two bearings fixed in the motor housing. A countershaft forms an extension of the rotor shaft and carries a toothed arrangement. The countershaft is coupled to the rotor shaft and is rotatably mounted in a bearing. The rotor shaft and countershaft engage axially with radial play and are coupled non-rotatably by co-operating radial projections and recesses receiving the projections. In the region of the overlapping portions of rotor shaft and countershaft, one of the shafts has an annular portion extending at least over a part of the circumference. The annular portion is substantially in line contact with an adjacent circumferential surface of the other shaft. The line contact permits misalignment of the rotor shaft and countershaft but reduces noise.

Abstract: A tool holder attachable to a spindle of a hammer and which can receive a bit, the bit having a shank with at least one retaining groove extending along part of the shank, the retaining groove having a defined length, a front end and a rear end that limit axial movement of the bit in the tool holder, which tool holder comprises a hollow cylinder having an axis, an axial bore, a rear end that can be attached to the spindle of the hammer, and a front end that can receive the shank of the bit so that the bit is slidable within the cylinder in an axial direction, at least one retaining element that is located so that it can extend radially into the bore of the cylinder and into the at least one retaining groove of the bit so that the retaining element can be hit by the rear end of the retaining groove during the transition to idling and limit the extent of axial movement of the bit within the cylinder, at least one radial restraining element limiting movement of the retaining element in the radial direction, at l

Abstract: A rotary hammer is provided which comprises a tool holder (2) and an air cushion hammering mechanism which comprises a cylinder (8′) having one end (8) that is connected to the tool holder, a piston (9), a ram (10) and a beat piece (21) slidably located in the cylinder so that reciprocation of the piston in the cylinder will cause the ram to reciprocate in the cylinder and thus cause the beat piece to hit a bit located in the tool holder. The ram (10) has an annular recess (31) in its peripheral surface at the end thereof nearest the piston (9), in which recess is located an annular seal (30). The annular seal has an annular seating flap (36) lying on the radially outwardly directed surface of the recess and an annular sealing flap (38) that is joined to the seating flap and extends between the radially outwardly directed surface of the recess and the inner wall of the cylinder (8′).

Abstract: A reciprocating saw 11 with a keyless blade clamp 35 having a slotted-channel 37 in a clamp body 39 for receiving a blade 40 alternatively in first and second, intersecting cutting planes. The blade 40 may be alternatively oriented in four 90° offset orientations with the blade teeth facing in the same directions as the top, bottom, left and right side of the saw 11. When the retainer 53 is in the clamp disengaged position, a blade 40 may be slidably inserted and removed from the channel 37 in any of the four 90° offset orientations. A retainer 53 is located in a track 51 in the clamp body 39 and is movable between clamp engaged and disengaged positions. When the blade 40 is located in the first cutting plane, the retainer 53 engages the edge 55 of the blade. When the blade 40 is in the second cutting plane, the retainer 53 engages the sidewall 57 of the blade 40.

Abstract: A rotary hammer which comprises a tool holder (2), an air cushion hammering mechanism which comprises a piston (9) and a beat piece (21) slideably located in a cylinder (8′) so that reciprocation of the piston in the cylinder will cause the beat piece to hit a tool located in the tool holder; and means for causing the cylinder to rotate in addition to, or instead of, reciprocation of the piston in order to cause a tool located in the tool holder to rotate. The piston (9) is formed from a plastics material and is sealed in the cylinder (8′) by an annular seal (27) that is located within an annular groove (26) in the piston. The annular seal has an inner diameter that is greater than the diameter of the radially outwardly directed surface of the groove, and the groove has an axial dimension that is greater than that of the annular seal, so that when the cylinder rotates about the piston (without reciprocation of the piston) the seal (26) will rotate with the cylinder (8′).

Abstract: A power tool (10) includes a motor (22) mounted there within. The motor has an output (20) for engagement with an input of an attachment member (32) presented thereto. The coupling between the motor output (20) and the attachment member (32) is by a snap-fit coupling achieved by way of resiliently biased arms (56) within the tool engaging with an annular recess (54) formed on the attachment member (32).

Abstract: A powered oscillating hand tool includes a drive unit having an electric motor and a drive shaft; a bearing eccentrically mounted on the drive shaft and located radially eccentrically relative to the drive shaft; a carrier plate mounted on the bearing and a platen for mounting on the carrier plate. The carrier plate is provided with a first engagement means and the platen is provided with second engagement means to engage with the first engagement means by rotation of the platen relative to the carrier plate. The first and second engagement means together comprise a bayonet fitting.

Abstract: A power tool system includes a tool body in which an activation switch (12) controls a motor (20). A plurality of interchangeable tool heads (50) are able to be accepted by the power tool in order to provide a dedicated tool. A releaseable lock-off mechanism (90) is incorporated in the tool body which restrains actuation of the activation switch (12) when none of the tool heads (50) is present.

Abstract: A power tool comprises a body (14) having a motor (22) with an output. A detachable tool head (50) is engageable with the motor output wherein the motor output has a first engagement member (32) for complimentary engagement with a second engagement member (62) on the tool head drive. The first engagement member (32) is recessed within the body (14) and accessible through an aperture (44) therein. And the second engagement member (62) is recessed within the tool head (52) and accessible through a second aperture therewithin.

Abstract: A brush assembly preferably for a universal motor comprises a tubular brush holder 13, a carbon brush 33, an arm 31 for biasing the brush and a spring 85 for biasing the arm. The brush is slidably mounted in the cavity 21 of the holder. A stop 61 is formed between the brush and the holder and has a disengaged position to permit travel of the brush partially through the inner end 25 of the holder and an engaged position to limit travel of the brush through the inner end 25 of the holder. The electrically conductive arm 31 is pivotally mounted on the support and extends through a slot 29 of the holder. A distal end 60 of the brush engages the outer end 53 of the brush and biases the brush 33 toward the inner end 25 of the cavity. The spring 85 is connected between the support 15 and the arm 31 for biasing the arm 31 into engagement with the brush 33. The arm is spaced outwardly of the end of the slot to apply a bias to the brush when the stop is in an engaged position.

Abstract: A sanding apparatus (1) is provided with a platen (2) formed of several layers and with a flat surface to which an abrasive sheet is attached. The platen (2) has a peripheral edge (7) with at least one point (4). A conductive means (18, 20) is provided through the layers of the platen (2) to act as a heat sink adjacent to the point (4) to remove heat from the surface point (4).

Abstract: A lock-off mechanism (80) for a power tool (2) comprises a longitudinally extended locking member (80) pivotally mounted within the power tool and having one end (86) resiliently biased into engagement with a power switch (12). The mechanism further comprising an actuation member extending substantially perpendicular to the locking member (80) so as to be displaceable transversely with respect to the locking member (80) and engagable therewith to effect cam engagement between a cam surface (300) of the actuation member and a cam surface (90) of the lever member (80) upon such transverse displacement of the actuation member, so as to pivotally displace the locking member (80) out of engagement with the switch (12).