摘要:
A hand held electrically powered hammer comprises a housing, a motor, and a hollow spindle. A piston and a ram are located for reciprocation within the spindle. A casing encloses at least part of the spindle so as to define a chamber between the spindle and the casing. A damping mass is slideably supported by a spacer and is located within the chamber and is connected to the hammer housing via a spring so as to oscillate back and forth along the spindle to minimize the vibration of the hammer housing and also so as to generate air flows within the chamber for facilitating heat transfer from the spindle to the metal casing.
摘要:
A rotary spindle 4 for a power tool such as a hammer drill is disclosed. The spindle 4 comprises a first spindle part 402 for rotation about its longitudinal an axis by means of a motor and having an inwardly directed rim 406, and a second spindle part 404 for supporting a drill bit of the hammer drill and having an outwardly directed rim 410. The second spindle part 404 extends through an aperture 408 in the first spindle part 402 and rims 406, 410 cooperate with each other to prevent removal of the second spindle part 404 from the first spindle part 402. A circlip 414 locks the first and second spindle parts 402, 404 together and maintains o-rings 412 under compression.
摘要:
A fastener driving tool arranged to drive fasteners into a workpiece includes at least one electric motor having a central stator and an external rotor arranged to rotate around the stator. The rotor may be in the form of a flywheel. The tool includes an energy transfer member such as a driver arranged to transfer kinetic energy from the rotor to a fastener held in the tool, thereby to drive the fastener from the tool into a workpiece. The electric motor may be a brushless motor. The tool may include two such motors, arranged such that both of their rotors propel the driver simultaneously.
摘要:
A fastener driving tool arranged to drive fasteners into a workpiece includes a support, a pair of sub-assemblies movably mounted on the support, each sub-assembly comprising a motor and an associated flywheel, and a nose part retractable relative to the support. The tool is arranged such that, in use, when the nose part is retracted, its movement relative to the support mechanically forces the sub-assemblies toward each other. The forcing of the sub-assemblies toward each other by the retraction of the nose part may move the sub-assemblies from an inoperative position to an operative position.
摘要:
A fastener driving tool arranged to drive fasteners into a workpiece includes a support, at least one wheel movably mounted on the support, a driver arranged to contact and he guided by the wheel when the wheel is in an operative position in use, a nose part retractable relative to the support, and a connection mechanism to operatively interconnect the nose part with the wheel. The tool is arranged such that, in use, the retraction of the nose part causes the connection mechanism to move the wheel from an inoperative position to the operative position. Subsequent forward movement of the driver guided by the wheel toward the nose part causes the operative interconnection between the nose part and the wheel to be broken. Forward movement of the nose part relative to the support, subsequent to the operative interconnection between the nose part and the wheel being broken, causes the operative interconnection between the nose part and the wheel to be re-formed.
摘要:
A fastener driving tool arranged to drive fasteners into a workpiece includes at least one electric motor having a central stator and an external rotor arranged to rotate around the stator. The rotor may be in the form of a flywheel. The tool includes an energy transfer member such as a driver arranged to transfer kinetic energy from the rotor to a fastener held in the tool, thereby to drive the fastener from the tool into a workpiece. The electric motor may be a brushless motor. The tool may include two such motors, arranged such that both of their rotors propel the driver simultaneously.
摘要:
A fastener supply assembly for a fastener driving tool includes an outlet passage arranged to expel fasteners from the assembly to a workpiece during use, a magazine comprising a plurality of supply channels arranged to hold fasteners and supply them to the outlet passage, and a channel selector. The channel select has an opening and is arranged to selectively connect, via its opening, the outlet passage with each respective supply channel of the magazine, by movement of the channel selector relative to both the magazine and a longitudinal axis of the outlet passage. The movement of the channel selector may comprise rotation about the longitudinal axis of the outlet passage.
摘要:
A fastener outlet assembly for a fastener driving tool includes: an outlet passage arranged to expel fasteners from the assembly to a workpiece during use, the outlet passage having one or more walls; and a detector arranged to detect whether a fastener is present in the outlet passage. The detector comprises at least part of a cover that provides at least part of a wall of the outlet passage, the cover being movable with respect to the remainder of the outlet passage to open the outlet passage and gain access thereto.
摘要:
A fastener supply assembly for a fastener driving tool includes an outlet passage arranged to expel fasteners from the assembly to a workpiece during use, a magazine comprising a plurality of supply channels arranged to hold fasteners and supply them to the outlet passage, and a channel selector. The channel select has an opening and is arranged to selectively connect, via its opening, the outlet passage with each respective supply channel of the magazine, by movement of the channel selector relative to both the magazine and a longitudinal axis of the outlet passage. The movement of the channel selector may comprise rotation about the longitudinal axis of the outlet passage.
摘要:
A hand held motor driven electrically powered tool, in particular a rotary hammer, comprising a spindle (40) for rotatingly driving a tool or bit (68), a spindle rotary drive train (14, 5, 10) for rotatingly driving the spindle (40) and an arrangement for detecting blocking events (16, 17). Blocking events occur when the tool or bit of the tool become rotationally fixed in the material being bored in which case the rotary drive on the spindle from the motor causes the tool housing to rotate in a user's grip. According to a first aspect of the invention an overload clutch (14) is provided in the spindle rotary drive train for transmitting rotary drive to the spindle below a predetermined torque and slipping above the predetermined torque arranged such that the overload clutch cuts off rotary drive to the spindle, for example by reducing the predetermined torque at which the overload clutch (14) slips when a blocking event is detected so as to cut off rotary drive to the spindle in response to a blocking event being detected. According to a second aspect of the invention there is provided a mode change mechanism (45, 47, 49, 43) for selectively disengaging a clutch (10, 7) so as to cut off the rotary drive to the spindle (40) and the clutch is disengaged when a blocking event is detected so as to cut off rotary drive to the spindle in response to a blocking event being detected.