A work tool includes a spindle, a clamp shaft and at least one biasing part. The spindle is configured to be reciprocally rotated within a specified angle range around a driving axis. The spindle has a first inclined face inclined in a direction crossing the driving axis. The clamp shaft includes a shaft part and a head part. The shaft part is configured to be coaxially inserted into the spindle. The head part is formed on a lower end portion of the shaft part and configured to clamp the tool accessory in cooperation with the spindle while a second inclined face of the tool accessory is pressed against the first inclined face. The at least one biasing part is provided in the spindle and configured to always bias the tool accessory downward while the tool accessory is clamped by the head part and the spindle.

A modular power tool apparatus provides a plurality of tool heads that are interchangeable between a selected tool head and any other comparable tool head, providing a user or operator the means to rapidly reconfigure a power tool for multiple roles and functions. The power unit is provided with an output shaft, a receiving cavity, and at least one locking mechanism. The output shaft is configured to engage to an input socket of the selected tool head a surrounding shell wall is positioned into the receiving cavity. The at least one locking mechanism captures at least one shelf on the shell wall to releasably fix the selected tool head into an operable configuration with the power unit.

Tool fitting device for a power tool, in particular a chipping hammer, including a holding device for receiving and holding a tool shank, a tool cap, and a dust protection device for preventing the penetration of dust into the tool fitting device. The tool cap includes at least one receiving element and the dust protection device includes at least one protruding element corresponding to the receiving element, such that the tool cap and the dust protection device are able to be connected together in a form-fitting manner. Dust protection device for use in a tool fitting device.

Tool fitting device for a power tool, in particular a chipping hammer, including a holding device for receiving and holding a tool shank, a tool cap, and a dust protection device for preventing the penetration of dust into the tool fitting device. The tool cap includes at least one receiving element and the dust protection device includes at least one protruding element corresponding to the receiving element, such that the tool cap and the dust protection device are able to be connected together in a form-fitting manner. Dust protection device for use in a tool fitting device.

A saw blade for a hand-operated machine tool, in particular a reciprocating saw blade, includes a blade portion having a cutting edge and an opposite blade rear, in particular a cutting edge which is defined by a large number of saw teeth. The saw blade further includes a chucking shaft provided to be received by a clamping chuck of the hand-operated machine tool and a lower edge and an opposite upper edge. A transition region is constructed between the chucking shaft and the blade portion, in which a difference in spacing between the spacing of the lower edge and upper edge of the chucking shaft and the spacing between the cutting edge and the blade rear is bridged. A transition region lower edge has a raised portion, in particular a raised portion for stress relief, between the lower edge of the chucking shaft and the cutting edge.

A saw blade for a hand-operated machine tool, in particular a reciprocating saw blade, includes a blade portion having a cutting edge and an opposite blade rear, in particular a cutting edge which is defined by a large number of saw teeth. The saw blade further includes a chucking shaft provided to be received by a clamping chuck of the hand-operated machine tool and a lower edge and an opposite upper edge. A transition region is constructed between the chucking shaft and the blade portion, in which a difference in spacing between the spacing of the lower edge and upper edge of the chucking shaft and the spacing between the cutting edge and the blade rear is bridged. A transition region lower edge has a raised portion, in particular a raised portion for stress relief, between the lower edge of the chucking shaft and the cutting edge.

A front grease retention unit is provided under a front plunger and a wall is provided between the retention unit and a gear accommodation unit. Furthermore, a front grease receiving member is provided under the front plunger and a front metal bearing, and grease falling into the front grease receiving member is sent toward the outer circumferential face of the front plunger. The grease is pushed out by using the vertical oscillation of a front metal anchor bolt in orbital mode. A rear grease receiving member is provided under a rear plunger and a rear metal bearing, and grease falling into the rear grease receiving member is sent toward the outer circumferential face of the rear plunger. The grease in a grease reservoir groove is pushed out by using the vertical oscillation of a rear metal anchor bolt in orbital mode.

A front grease retention unit is provided under a front plunger and a wall is provided between the retention unit and a gear accommodation unit. Furthermore, a front grease receiving member is provided under the front plunger and a front metal bearing, and grease falling into the front grease receiving member is sent toward the outer circumferential face of the front plunger. The grease is pushed out by using the vertical oscillation of a front metal anchor bolt in orbital mode. A rear grease receiving member is provided under a rear plunger and a rear metal bearing, and grease falling into the rear grease receiving member is sent toward the outer circumferential face of the rear plunger. The grease in a grease reservoir groove is pushed out by using the vertical oscillation of a rear metal anchor bolt in orbital mode.

A reciprocating saw includes a blade assembly having a spindle and a blade clamp. The blade clamp includes a cover rotatably coupled to the spindle, and a detent movable in a radial direction to adjust the blade clamp between a locked configuration and an unlocked configuration. The cover is rotatable between a first rotational position relative to the spindle coinciding with the locked configuration, and a second rotational position relative to the spindle coinciding with the unlocked configuration. The reciprocating saw further includes a barrel surrounding at least a portion of the blade clamp. The barrel includes a plurality of projections extending from the barrel toward the blade clamp. At least one of the projections is engageable with the cover to rotate the cover from the second rotational position to the first rotational position, thereby adjusting the blade clamp from the unlocked configuration toward the locked configuration.

A reciprocating saw includes a blade assembly having a spindle and a blade clamp. The blade clamp includes a cover rotatably coupled to the spindle, and a detent movable in a radial direction to adjust the blade clamp between a locked configuration and an unlocked configuration. The cover is rotatable between a first rotational position relative to the spindle coinciding with the locked configuration, and a second rotational position relative to the spindle coinciding with the unlocked configuration. The reciprocating saw further includes a barrel surrounding at least a portion of the blade clamp. The barrel includes a plurality of projections extending from the barrel toward the blade clamp. At least one of the projections is engageable with the cover to rotate the cover from the second rotational position to the first rotational position, thereby adjusting the blade clamp from the unlocked configuration toward the locked configuration.