A hand-held power tool, in particular a rotary hammer, is indicated that includes a machine housing (10) with a tool fitting (12) integrated therein, the tool fitting (12) being rotatably drivable in a first mode and being non-rotatably fixable on the machine housing (10) in a second mode, and that
A hand-held power tool, in particular a rotary hammer, is indicated that includes a machine housing (10) with a tool fitting (12) integrated therein, the tool fitting (12) being rotatably drivable in a first mode and being non-rotatably fixable on the machine housing (10) in a second mode, and that includes a duty-type switch (20) with a coupling element (21) capable of being displaced to activate the modes, and an actuating element (22) that induces its displacement. To prevent maloperation and resultant damage to the machine when the operator switches between modes, the actuating element is designed as an electrical actuator (23), preferably as an electromagnet (25) controlled by an electronic control unit (24) (FIG. 1).
대표청구항▼
What is claimed is: 1. A hand held power tool, comprising: a machine housing (10), a tool fitting (12) integrated therein, the tool fitting (12) being drivable in a rotatory manner by an electric motor (19) in a first mode of operation and being non-rotatably fixable to the machine housing (10) in
What is claimed is: 1. A hand held power tool, comprising: a machine housing (10), a tool fitting (12) integrated therein, the tool fitting (12) being drivable in a rotatory manner by an electric motor (19) in a first mode of operation and being non-rotatably fixable to the machine housing (10) in a second mode of operation, a duty-type switch (20) and a coupling element (21) displaceable to activate the modes, and an actuating element (22) that includes a displacement of said coupling element, wherein the actuating element includes an electrical actuator (23) and an electronic control unit (24) that controls the actuator (23), wherein a manually operated, electric switch (36) for turning the machine on and off is located on the maching housing (10), electric switch (36) being designed such that it must be manually held against the force of a reset spring (38) in the mode with tool fitting (12) being driven in a rotating manner, wherein an electromagnet (39) controlled by the control device (24) is assigned to the electric switch (36), the magnetic force of which is greater than the spring force of the reset spring (38), and the control unit (24) is configured such that it supplies an excitation current for the electromagnet (39) assigned to the electric switch (36) with a tool fitting (12) installed on the machine housing (10). 2. The hand-held power tool as recited in claim 1, wherein the electric switch (36) is configured such that it is manually liftable away from the energized electromagnet (39) to be moved to its open position. 3. The hand-held power tool as recited in claim 2, wherein the electric switch (36) includes a flip switch (37) designed in the manner of a rectangular lever with a long and a short lever arm (371, 372), and is configured such that the switch (36) is movable into its closed position by a compressive force on the long lever arm (371), and such that it can be moved to its open position by a compressive force on the short lever arm (372) against the magnetic force of the energized electromagnet (39). 4. The hand-held power tool as recited in any one of the claims 2 or 3, wherein the duty-type switch (20) includes a sensor (41) connected to the control unit (24) for classifying a tool (13) inserted in the tool fitting (12), and wherein the control unit (24) triggers the actuator (23) for adjusting the tool (13) installed in the tool fitting (12) as a function of the classification signal from the sensor (41). 5. Hand-held power tools as recited in claim 1, wherein the actuator (23) is an electrical servomotor. 6. The hand-held power tool as recited in claim 1, wherein the actuator (23) is an electromagnet (25). 7. The hand-held power tool as recited in claim 1, wherein the coupling element (21) includes an engaging fork (26) actuated by the actuator (23), to which the intermediate ring (27) is fastened and on which the reset spring (28) acts. 8. The hand-held power tool as recited in claim 6, wherein the actuating element (22) includes a reset spring (28) with a spring force directed against the magnetic force of the electromagnet (25). 9. A hand held power tool, comprising: a machine housing (10), a tool fitting (12) integrated therein, the tool fitting (12) being drivable in a rotatory manner by an electric motor (19) in a first mode of operation and being non-rotatably fixable to the machine housing (10) in a second mode of operation, a duty-type switch (20) and a coupling element (21) displaceable to activate the modes, and an actuating element (22) that induces a displacement of said coupling element wherein the actuating element includes an electrical actuator (23) and an electronic control unit (24) that controls the actuator (23), wherein the tool fitting (12) is fixedly coupled to a drive sleeve (14) rotatably supported in the machine housing (10), a driven wheel (16) of toothed gearing (15)--preferably bevel gearing--coupled to an electric motor (19) is rotatably mounted on the drive sleeve (14), a gear rim (32) axially directly adjacent to the driven wheel (16) is rotatably mounted on the drive sleeve (14), the driven wheel (16) includes a gear rim (31), the tooth spacing of which matches that of the gear rim (32), and a toothed section (30) which has the same tooth spacing that encompasses the drive sleeve (14) and faces the gear rim (32) is located on the housing (10), the coupling element (21) includes an axially displaceable intermediate ring (27) with internal toothing (271) configured such that it is selectively engageable with the gear rim (32) and the toothed section (30) on the machine housing (10) or with the gear rim (32) or with the gear rim (32) and the gear rim (31) on the driven wheel (16), wherein the duty-type switch (20) includes a button (33) located on the machine housing (10) for preselection of the modes, the button (33) being connected to the control unit (24), wherein a manually operated, electric switch (36) for turning the machine on and off is located on the machine housing (10), electric switch (36) being designed such that it must be manually held against the force of a reset spring (38) in the mode with tool filling (12) being driven in a rotating manner, and wherein an electromagnet (39) controlled by the control device (24) is assigned to the electric switch (36), the magnetic force of which is greater than the spring force of the reset spring (38), and the control unit (24) is configured such that it supplies an excitation current for the electromagnet (39) assigned to the electric switch (36) during the mode with a tool fitting (12) installed on the machine housing (10), and wherein, when the electromagnet (25) is triggered, the intermediate ring (27) is moved to a displacement setting in which its internal toothing (271) is engaged with the gear rim (32) on the drive sleeve (14) and with the toothed section (30) on the machine housing (10). 10. The hand-held power tool as recited in claim 9, wherein the electromagnet (25) is triggered with reduced excitation current that ensures that the displacement of the intermediate ring (27) is sufficient to disengage its internal toothing (271) from the gear rim (31) on the driven wheel (16). 11. The hand-held power tool as recited in claim 9, wherein, in the mode with a rotatably driven tool fitting (12), the electromagnet (25) is de-energized and the intermediate ring (27) is moved by the reset spring (28) acting on the engaging fork (26), so that internal toothing (271) is engaged with the gear rim (31) on the driven wheel (16). 12. The hand-held power tool as recited in claim 9, wherein the sensor detects a movement quantity of the machine housing. 13. The hand-held power tool as recited in claim 12, wherein the movement quantity of the machine housing is selected from the group consisting of acceleration, speed, and path of rotation.
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이 특허에 인용된 특허 (10)
Greitmann, Ralf, Device for switching operating mode for hand tool.
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