HAND MACHINE TOOL

Description

[0001] The present invention relates to a chiseling hand-held power tool. The hand-held power tool has a locking switch that enables continuous operation without the user having to constantly hold down a power button. EP1864761 A1 discloses a hand-held power tool according to the preamble of claim 1. DISCLOSURE OF THE INVENTION

[0002] The handheld power tool according to the invention has a percussion mechanism, an electric motor for driving the percussion mechanism, and a monostable operating button having a stable switching position and a pressed switching position. A device control switches the electric motor off in response to the stable switching position and activates the electric motor in response to the pressed switching position. A locking switch has a sliding direction, an actuating knob, a pawl, and a sliding block, wherein the actuating knob can be moved by the user along the sliding direction from a release position to a locking position. The pawl can be pivoted between a first position and a second position in a pivoting direction perpendicular to the switching direction.In the first position, the latch is disengaged from the operating button, and in the second position, the latch engages the operating button, inhibiting the operating button in the pressed position. The latch has a guide surface on one side facing in the pivoting direction that is inclined relative to the sliding direction. The sliding block rests against the guide surface in the released position.

[0003] In the released position, the sliding block releases the latch from the operating button. The switching mechanism is robust against dust and wear.

[0004] In one embodiment, the latch has a spring that applies force to the latch in the opposite direction to the pivoting direction. The spring acts in the same direction as the sliding block.

[0005] The latch may have a side facing opposite to the pivoting direction, on which a further inclined guide surface is provided relative to the sliding direction, and a finger is rigidly connected to the actuating knob, the finger resting against the further guide surface.

[0006] The monostable operating button can have a reset element which biases the operating button against the switching direction.

[0007] The monostable operating button may have a switch cap graspable by a user, which has a locking surface interacting with the latch.

[0008] In the second position of the latch, the sliding block may be disengaged from the sliding surface. SHORT DESCRIPTION OF THE CHARACTERS

[0009] The following description explains the invention using exemplary embodiments and figures. The figures show: Fig. 1 a hammer drill Fig. 2 Rest position of the operating button Fig. 3 Pressed position of the operating button Fig. 4 Locked position of the operating button Fig. 5 Detailed view in section VV Fig. 6 Detailed view in section VI-VI Fig. 7 Detailed view of the handle

[0010] Identical or functionally equivalent elements are indicated by identical reference numerals in the figures, unless otherwise stated. EMBODIMENTS OF THE INVENTION

[0011] Fig. 1 shows a hammer drill as an example of a hand-held power tool 1. The exemplary hammer drill 1 has a tool holder 2, in which a tool 3 can be inserted and locked. The tool 3 is for example a drill, a chisel, etc. The exemplary embodiment shown rotates the tool holder 2 around a working axis 4and at the same time periodically strikes the tool along the working axis 4 The hand tool 1 can have a mode selector switch 5 which allows the user to selectively activate and deactivate the rotary movement and the impact operation. The user can use the hand tool 1 with a monostable operating button 6 put into operation.

[0012] The hand tool 1 has a handle 7. The user can use the hand tool 1 during operation with the handle 7 hold and guide. Preferably, the operating button 6 on the handle 7 positioned so that the user can press the operating button 6 with which the handle 7 gripping hand. The handle 7 can be from a machine housing 8be decoupled via damping elements.

[0013] The hand tool 1 has a rotary drive 9, which with the tool holder 2 The rotary drive 9 can include a reduction gear 10, a slip clutch 11 An output shaft 12 of the rotary drive 9 is attached to the tool holder 2 connected. The rotary drive 9 is connected to an electric motor 13 The user can control the electric motor 13 by pressing the operating button 6 on and off, whereby the operating button 6 accordingly a power supply of the electric motor 13 In one embodiment, a speed of the electric motor 13 via the operating button 6 be set.

[0014] The hand tool 1 has a pneumatic percussion mechanism14. The pneumatic percussion mechanism 14 has an excitation piston 15 and a percussion piston 16. The excitation piston 15 is rigidly connected to the electric motor 13 coupled. An eccentric wheel 17 and a connecting rod 18 transform the rotational movement of the electric motor 13 into a translational movement on the working axis 4. The excitation piston 15 and the percussion piston 16 close a pneumatic chamber between each other 19 A radial closure of the pneumatic chamber 19 In the illustrated embodiment, it is provided with a guide tube 20 which also controls the excitation piston 15 and the percussion piston. In other embodiments, the percussion piston can be hollow and the excitation piston 15 is guided in the percussion piston or vice versa. The pneumatic chamber 19trapped air is forced through the excitation piston 15 compressed and decompressed. The pressure changes couple the striker piston to the movement of the exciter piston 15 the pneumatic chamber 19 behaves analogously to a spring, hence the name air spring. The piston 16 can be applied directly to the tool 3 or indirectly via a Döpper 21 hit the tool.

[0015] The hand tool 1 is controlled by the operating button 6 on and off. The power button 6 is in the handle 7 The operating button 6 has a switch cap 22, which the user can grasp. The switch cap 22 is in a rest position of the operating button 6 from the handle 7 against a switching direction 23 before ( Fig. 2 ). The switch cap 22is preferably located on a stop 24 of the machine housing 8 The user can adjust the switch cap 22 in switching direction 23 press into a depressed switching position ( Fig. 3 ). The switch cap 22 can be placed in the handle 7 slide or swivel in. The switch cap 22 can be pivoted around a bearing point or guided linearly, as shown in the example. The switch cap 22 is away from the attack 24. The switch cap 22 is protected by a reset element 25, e.g. a coil spring, subjected to a force which is opposite to the switching direction 23 The reset element 25 is more tensioned in the pressed switching position than in the rest position, whereby the switching cap 22 is only stable in the rest position. The switch cap 22returns to the rest position when the user releases the switch cap 22 The switching direction 23 is preferably antiparallel to the working direction 26 in which the tool 3 points.

[0016] The switch cap 22 is equipped with a switching mechanism 27 the operating button 6 coupled. The switching mechanism 27 deactivates the electric motor 13, when the switch cap 22 is in the rest position. The switching mechanism 27 activates the electric motor 13, when the switch cap 22 is in the pressed position. The switching mechanism 27 may include an electromechanical, optical, magnetic or other sensor for determining the position of the switch cap 22 The switching mechanism 27 In one version, a speed or power consumption of the electric motor 13depending on the different pressure levels.

[0017] The hand tool 1 has a locking switch 28. The locking switch has a release position ( Fig. 2 ; Fig. 3 ) and a locking position ( Fig. 4 ). The locking switch 28 has a pivoting handle 29, which in the locking position into the switch cap 22 engages. The handle 29 inhibits the movement of the switch cap 22 opposite to the switching direction 23 and thus the return of the switch cap 22 into the rest position. The operating button 6 remains in the depressed switch position. The electric motor 13 remains activated even if the user removes the switch cap 22 lets go.

[0018] The handle 29 interacts with the switch cap 22. The switch cap 22 has a restricted area30, on which the handle 29 in the locking position. The locking surface 30 can be achieved by the outer contour of the switch cap 22 or by an externally accessible rib or similar. The blocking surface 30 is preferably largely perpendicular to the switching direction 23. The restricted area 30 points opposite to the switching direction 23 and towards the handle 29.

[0019] The handle 29 is in a swivel direction 31 pivotable, which is perpendicular to the switching direction 23 is. The handle 29 can be switched between a first position associated with the releasing position and a second position associated with the locking position in the switching direction 23 The handle 29 is in the releasing position without overlap with the blocking surface 30.The overlap refers to the switching direction 23, ie the overlap can be projected onto a plane perpendicular to the switching direction 23 be determined. The handle 29 is in the locking position with the locking surface 30 overlapping. A tip 32 the handle 29 is in switching direction 23 at the restricted area 30 The top 32 exerts a counterforce to the return element analogous to the gripping hand, whereby the operating button 6 remained pressed.

[0020] The position of the tip 32 along the switching direction 23 corresponds to the position of the blocking area 30 along the switching direction 23 with the power button pressed 6. The summit 32 can be accessed via the restricted area 30 in switching direction 23 protrude when the operating button 6is in the rest position. The locking switch 28 is switched off when the hand tool is 1 nonfunctional.

[0021] The handle 29 For example, an elastic spring 33 hung. The spring 33 can be realized, for example, by a leaf spring, which at one end 34 with the machine housing 8 The spring 33 exerts a counter-swivel direction 31 force acting on the handle 29 out. The spring 33 can be relaxed in the released position, ie force-free. The spring 33 is more tense in the locked position than in the released position. The latch 29 has a tendency to move automatically from the locked position to the released position.

[0022] The locking switch 28 has an operating knob 35,which is within reach of the user. The user can press the operating knob 35 between a first position and a second position in the sliding direction 36 The first position is the release position of the locking switch 28 and the second position is the locking position of the locking switch 28 associated. The sliding direction 36 is preferably parallel to the switching direction 23 the operating button 6. A backdrop 37 couples the operating knob 35 with the handle 29.

[0023] The backdrop 37 has an upper side with an inclined backdrop surface 38. The upper side faces the opposite direction of rotation 31, is e.g. the operating knob 35 The inclined backdrop surface 38 is opposite to the switching direction 23 inclined. The inclined backdrop surface 38is preferably in the releasing position and the locking position relative to the switching direction 23 inclined. The inclined backdrop surface 38 falls along the switching direction 23 in swivel direction 31 off. The operating knob 35 has a finger 39, which against the inclined backdrop surface 38 presses. The finger 39 shifts the scenery 37 in the swivel direction 31, when the operating knob 35 is moved into the locking position. The latch 29 can be done by the spring 33 pre-tensioned against the finger 39 Press, both in the release position and the locking position. The latch 29 returns automatically from the locking position to the releasing position when the finger 39 applied contact pressure during its movement along the inclined guide surface 38subsides.

[0024] The backdrop 37 has a lower side with an inclined backdrop surface 40. The lower side points in the swivel direction 31, is e.g. from the operating knob 35 The inclined backdrop surface 40 is opposite to the switching direction 23 inclined. The inclined backdrop surface 40 increases along the switching direction 23 in swivel direction 31 The inclined backdrop surface 40 is preferably in the releasing position and the locking position relative to the switching direction 23 tilted. The operating knob 35 has a sliding block 41, which is the backdrop 37 engaging behind the inclined backdrop surface 40 The sliding block 41 can the handle 29 from the locking position to release the spring 33 to support. The handle 29,the backdrop 37 and the feather 33 are preferably implemented as leaf springs.

[0025] Fig. 7 shows the scenery 37 and the handle 29 in a view of the lower side. The position of the locking switch 28 corresponds to the Fig. 4 . In the locking position, the sliding block is 41 preferably not in engagement with the backdrop 37. The intervention of the sliding block 41 is, for example, through a narrower section 42 the backdrop 37 realized. The narrower section 42, for example, a recess in the leaf spring, borders on the inclined link surface 40 The backdrop area 40 overlaps laterally with the sliding block 41. Accordingly, the sliding block 41 on the backdrop 40 in the releasing position, as in Fig. 3 and Fig. 5 illustrated. The narrower section 42 forms an opening in which the sliding block 41 lying, the backdrop area 40 The arrangement and dimensions of the narrower section 42 are chosen in such a way that the sliding block 41 with the section 42 does not overlap when the locking switch 28 is in the locking position (see Fig. 6 ).

Claims

1. Hand-held power tool comprising a hammer mechanism (14), an electric motor (13) for driving the hammer mechanism (14), a monostable operating button (6) which has a stable switching position and a pressed switching position, a device control which switches off the electric motor (13) in response to the stable switching position and which activates the electric motor (13) in response to the pressed switching position, a locking switch (28) which has a sliding direction (36), an actuating knob (35), a catch (29) and a sliding block (41), the actuating knob (35) being movable by the user in the sliding direction (36) from a releasing position into a locking position, the catch (29) being pivotable in a pivoting direction (31) perpendicular to the switching direction (23) between a first position and a second position, the catch (29) being disengaged from the operating button (6) in the first position and the catch (29) engaging in the operating button (6) in the second position, arresting the operating button (6) in the pressed position, the catch (29) having, on a side facing in the pivoting direction (31), a slotted-guide face (40) inclined relative to the sliding direction (36), characterized in that the sliding block (41) is rigidly connected to the actuating knob (35) and rests against the slotted-guide face (40) in the released position.

2. Hand-held power tool according to claim 1, characterized in that the catch (29) has a spring (33) by which the catch (29) is force-loaded counter to the pivoting direction (31).

3. Hand-held power tool (1) according to either claim 1 or claim 2, characterized in that the catch (29) has a side facing opposite to the pivoting direction (31), on which side a further inclined slotted-guide face (38) is provided relative to the sliding direction (36), and a finger (39) is rigidly connected to the actuating knob (35), the finger (39) resting against the further slotted-guide face (38).

4. Hand-held power tool (1) according to any of the preceding claims, characterized in that the monostable operating button (6) has a restoring element (25) which preloads the operating button (6) counter to the switching direction (23). Hand-held power tool (1) according to any of the preceding claims, characterized in that the monostable operating button (6) has a switching cap (22) which can be gripped by a user and which has a blocking face (30) which interacts with the catch (29).

5. Hand-held power tool (1) according to any of the preceding claims, characterized in that the sliding block (41) is disengaged from the slotted-guide face (40) in the second position of the catch (29).