CN106488831B

CN106488831B - Electric machine tool with slide switch

Info

Publication number: CN106488831B
Application number: CN201580037805.6A
Authority: CN
Inventors: M·卢茨; T·朔米施
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2014-07-10
Filing date: 2015-05-05
Publication date: 2021-03-09
Anticipated expiration: 2035-05-05
Also published as: AU2015287069A1; CN106488831A; WO2016005072A1; KR20170032286A; DE102014213394A1

Abstract

The invention relates to an electric power tool (10) having a tool receptacle (20) and a tool housing (24) in which a drive motor (12) for driving the tool receptacle (20) is arranged, wherein a slide switch axially preloaded by a restoring spring for manually switching the drive motor (12) on and off is arranged on the tool housing (24) so as to be longitudinally movable in the direction of the tool housing (24) and/or so as to be pivotable relative to a longitudinal axis (32). At least one holding geometry is provided in the electric power tool, which holding geometry is designed to hold the slide switch in a holding state when a predetermined holding force (F) is manually applied to the slide switch by a user and to automatically place the slide switch in a non-operating state when the slide switch is released by the user, wherein the drive motor (12) is switched on in the holding state and switched off in the non-operating state.

Description

Electric machine tool with slide switch

Background

The invention relates to an electric power tool having a tool receptacle and a tool housing in which a drive motor for driving the tool receptacle is arranged, wherein a slide switch axially preloaded by a restoring spring for manually switching the drive motor on and off is arranged on the tool housing so as to be longitudinally displaceable in the direction of a longitudinal axis of the tool housing and/or so as to be pivotable relative to the longitudinal axis.

Electric power tools of this type are known from the prior art, which are provided, for example, with a tool housing in the form of a rod and are designed according to the type of angle grinder. Such angle grinders are often operated by means of a slide switch which, in order to facilitate operation, can be permanently latched in its on position, for example by a combined sliding and tilting movement, so that the permanent actuation of the slide switch is dispensed with or the user presses it against the force of a restoring spring. However, to turn off the angle grinder, the user is required to unlock the slide switch by an active flip and slide motion.

A disadvantage of the prior art is that in such angle grinders, the latching of the slide switch on the tool housing is designed to be self-retaining. This can lead to an uncontrolled, automatic restart of the electric power tool after a fault in the operation of the electric power tool, for example after a brief interruption of the respective current supply, and thus, for example, to a breakdown of the associated insertion tool.

Disclosure of Invention

The object of the present invention is therefore to provide a new electric power tool in which an uncontrolled restart after an interruption of the associated current supply can be prevented.

The problem is solved by an electric power tool having a tool receptacle and a tool housing in which a drive motor for driving the tool receptacle is arranged. The slide switch, which is axially preloaded by a restoring spring and is used for manually switching on and off the drive motor, is arranged on the tool housing so as to be longitudinally movable in the direction of the longitudinal axis of the tool housing and/or so as to be pivotable relative to the longitudinal axis. At least one holding geometry is provided, which is designed to hold the slide switch in a holding state when a predetermined holding force is manually applied to the slide switch by a user and to automatically place the slide switch in a non-operating state when the slide switch is released by the user, wherein the drive motor is switched on in the holding state and switched off in the non-operating state.

The invention therefore makes it possible to provide an electric power tool in which a continuous operation of the drive motor with the switch-on operation can be achieved by the user by applying a low holding force to the slide switch, and the slide switch can be safely and reliably prevented from self-locking after it is released.

According to one embodiment, an electrical on/off switch in electrically conductive connection with the drive motor is mechanically coupled to the slide switch via the slide member.

Thus, in a simple manner, the on and off function of the drive motor can be realized by the slide switch. Furthermore, a spatial separation between the slide switch and the electrical on/off switch is provided.

Preferably, the sliding part has a connection geometry for pivotably coupling the sliding switch in an associated pivot point of pivoting.

Thereby providing a spatially defined movement of the slide switch.

Preferably, the slide switch has an operating side facing away from the tool housing and a functional side facing the tool housing, wherein at least one sliding geometry and a driver for the sliding part are provided on the functional side.

Due to the preferably ergonomically configured operating side of the slide switch, a comfortable operation by the user is provided. The functional side of the slide switch allows a defined movement sequence to be achieved and the on/off switch to be activated when the slide switch is operated by a user.

According to one embodiment, the sliding geometry is formed by a projection on the functional side, which is guided on the tool housing and is arranged in the region of a first axial end of the sliding switch facing the tool receptacle, wherein an edge of the sliding switch facing away from a second axial end of the tool receptacle, which edge points toward the tool housing, and a retaining surface of a recess in the tool housing, which retaining surface is inclined relative to the longitudinal axis of the tool housing, form a retaining geometry for latching the sliding switch in the retaining state.

A particularly simple and uncomplicated retaining function of the slide switch on the tool housing can thus be achieved.

Preferably, the sliding geometry is formed by a projection on the functional side, which is guided on the tool housing, which is arranged in the region of a first axial end of the slide switch facing the tool receptacle, and a projection pointing toward the tool housing is formed on the slide switch, axially spaced apart from the projection, in the direction of a second axial end of the slide switch facing away from the tool receptacle, wherein an abutment surface of the projection on the tool housing and a retaining surface of the recess in the tool housing, which is inclined in relation to the longitudinal axis of the tool housing in each case to the abutment surface, form a retaining geometry for latching the slide switch in the retaining state.

This provides a holding function of the slide switch on the tool housing of the electric power tool, independently of the respective rear edge of the slide switch.

Preferably, a distance is provided between the projection of the slide switch and the abutment surface of the projection.

Thereby, the retaining functionality of the slide switch can be configured efficiently when the slide switch is depressed by the user.

Preferably, a predefined lever length is formed between the projection of the slide switch and the second axial end, wherein the ratio between the aforementioned distance and the lever length lies in the range from 0.2 to 0.8.

The holding force exerted by the user can thus be adjusted in such a way that an ergonomically and in particular fatigue-free continuous operation of the electric power tool is possible.

Preferably, the angle between the retaining surface of the recess in the tool housing and the longitudinal axis of the tool housing is between 35 ° and 85 °.

Thus, the lug is prevented from sliding uncontrolled off the retaining face of the tool housing.

Preferably, the depression height of the recess in the tool housing is less than or equal to the height of the projection of the slide switch.

Thereby avoiding excessive material weakening of the tool housing.

According to one embodiment, the axial end edge on the functional side forms the sliding geometry and, when the sliding switch is pivoted, forms a pivot point.

This provides a particularly simple design of the slide switch.

According to one embodiment, a sliding ramp for the sliding geometry of the sliding switch is formed on the tool housing.

Due to the sliding ramp, a pronounced pivoting movement of the sliding switch relative to the longitudinal axis can be achieved.

According to one embodiment, the holding geometry is formed with an abutment surface of a projection on the slide switch, which is inclined with respect to the longitudinal axis of the tool housing, and a holding surface of a recess of the tool housing, which is inclined with respect to the longitudinal axis of the tool housing, wherein the projection is formed on the functional side of the slide switch in the region of a first axial end of the slide switch, which faces the tool receptacle, and wherein a projection forming the slide geometry is arranged in the region of a second axial end of the slide switch.

This enables a mirror-image arrangement of the holding geometry and the sliding geometry on the sliding switch.

According to one embodiment, the pivot point is located between the first and second axial ends of the slide switch, and a retaining geometry is provided on each side of the pivot point.

In this way, the user can exert a holding force in the region of the first or second axial end of the slide switch or on both sides of the pivot point in order to lock the slide switch in the holding state for the continuous operation of the drive motor of the electric power tool.

According to one embodiment, the pivot point is arranged on the first or second axial end of the sliding switch and is provided with at least one, preferably three, holding geometries.

This enables a particularly reliable latching of the slide switch in the holding state. Furthermore, since the slide switch is hinged to the slide part at the end side, a very effective leverage is provided which requires a small holding force.

According to one embodiment, the slide switch is configured to be movable parallel to a longitudinal axis of the tool housing, wherein the retaining geometries are arranged in the region of the first and second axial ends of the slide switch, respectively.

The design of the slide switch is thereby simplified, since the pivot point is eliminated and the retaining geometry assumes the function of a spherical sliding geometry, for example.

According to one embodiment, a radially inwardly directed projection is formed on the motor housing associated with the drive motor, which projection has a holding surface inclined relative to the longitudinal axis of the tool housing, which holding surface forms a holding geometry with a correspondingly inclined contact surface of the radially outwardly directed projection on the sliding part relative to the tool housing.

The holding geometry can thereby be realized independently of the slide switch and within the tool housing of the electric power tool.

According to a further embodiment, a retaining hook is provided on a first axial end of the sliding switch facing the tool receptacle, which retaining hook can be latched to a latching hook formed on the tool housing, wherein the retaining hook and the latching hook form a retaining geometry.

Due to the latching hooks formed on the inside of the tool housing, a covering retaining geometry for the sliding switch can be achieved.

Drawings

The invention is explained in detail in the following description on the basis of embodiments shown in the drawings. The figures show:

figure 1 is a perspective view of the power tool of the present invention configured as an angle grinder,

figure 2 a perspective and partially open partial view of the angle grinder of figure 1,

figure 3 shows a first embodiment of a slide switch usable with the electric power tool of figure 1 in a non-operating state,

figure 4 the slide switch of figure 3 is in the hold state,

figure 5 a second embodiment of a slide switch usable with the power tool of figure 1 in a holding state,

figure 6 the slide switch of figure 5 is in a non-operating state,

fig. 7-13 are other embodiments of a slide switch that may be used with the power tool of fig. 1, an

Fig. 14 to 16 show a further alternative embodiment of a slide switch which can be used with the electric power tool of fig. 1 when transitioning from an inoperative state into a holding state.

Detailed Description

Fig. 1 shows an exemplary electric power tool 10, which is illustratively designed according to the type of hand-held angle grinder and has a drive motor 12, which can be any motor type, for example an electronically commutated motor or a direct current motor. The drive motor 12 serves to drive a drive shaft 14, which is connected via a bevel gear 16 and a driven shaft 18 to a tool receptacle 20, wherein the tool receptacle 20 is designed to receive a rotatably drivable insertion tool 22, such as a grinding, roughing or dividing disc. The drive motor 12 can be switched at least on and off by means of a slide switch 30 arranged on the preferably rod-shaped tool housing 24 of the power tool 10. The slide switch 30 is preferably at least movably configured along a longitudinal axis 32 of the tool housing 24. The energy supply of the drive motor 12 takes place, for example, via the mains line 34 or alternatively by means of one or more associated battery packs.

It should be noted, however, that the manner of functioning and the design of suitable drive motors or suitable angle grinders are sufficiently known to the expert from the prior art. Therefore, their description is omitted here for simplicity and conciseness of the description. It should furthermore be noted that the invention is not limited to hand-held angle grinders which are operated as a function of the electrical power supply system, but rather can be used entirely in general in electric power tools which are operated as a function of the electrical power supply system or independently of the electrical power supply system (for example via an associated battery pack) and which have a slide switch for switching on and off an associated drive motor, for example in polishing machines, sanding machines, milling machines, jigsaw saws, etc. The invention can also be used in hand-held power tools that can be operated without electricity and can be switched on and off by an associated slide switch.

Fig. 2 shows the electric power tool 10 of fig. 1, which according to one specific embodiment has an electrical on/off switch 40, which is mechanically coupled to the slide switch 30 of fig. 1 via a slide 50. The sliding switch 30 is prestressed axially, i.e. parallel to the longitudinal axis 32, by means of a restoring spring 52 arranged on the sliding part 50, so that the sliding switch 30 released by the user is automatically pulled back in the direction of the network line 34. The on/off switch 40 is in electrical contact with the drive motor, for example via two

lines

42,44, and with two

further lines

46,48 of the power supply line 34, so that the drive motor can be switched on and off by moving the slide switch 30 against the restoring force exerted by a restoring spring 52 and/or by tilting the slide switch relative to the longitudinal axis 32.

In the following description, reference is made to fig. 3 and 4 simultaneously, fig. 3 and 4 showing a first embodiment of a slide switch 100 that can be used with the electric power tool 10 of fig. 1. The slide switch preferably has an actuating side 102, which is preferably designed ergonomically, and a functional side 104, which has a slide geometry 106 and faces the tool housing 24, and which points away from the tool housing 24 of the electric power tool 10 from fig. 1. The sliding part 108 for the mechanical coupling of the sliding switch 100 with the electrical on/off switch 40 of fig. 2 has a connection geometry 110 for swingably coupling the sliding switch 100 up in a swing fulcrum 112.

The sliding geometry 106 is preferably formed by a projection 116 of the functional side 104, which projection 116 is guided on the tool housing 24, wherein the projection 116 has a preferably at least approximately semicircular cross-sectional geometry and is arranged in the region of a first axial end 118 of the sliding switch 100, which end faces the tool receptacle 20 of fig. 1 by way of example. When a user manually applies a sufficiently high holding force F to the slide switch 100 perpendicularly to the longitudinal axis 32, for example by means of a finger, in the region of the second axial end 120 of the slide switch 100 pointing away from the first axial end 118, the edge 122 and the holding surface 124 of the recess 126 of the tool housing 24, which is formed obliquely to the longitudinal axis 32, form a holding geometry 128 for latching the slide switch 100 in the holding state when the drive motor is switched on (see fig. 4).

In order to switch on the drive motor of the electric power tool 10 of fig. 1, the user must move the slide switch 100, starting from the inoperative state illustrated in fig. 3, in the direction of the arrow 130 parallel to the longitudinal axis 32 and against the restoring force of the restoring spring 52 of fig. 2, until the holding state of the slide switch 100 illustrated in fig. 4 is reached, in which the edge 122 rests against the holding surface 124 by a holding force F applied by the user and acting on the slide switch 100 in the figure substantially perpendicularly to the longitudinal axis 32. Due to the lever action of the slide switch 100 pivotably coupled to the slide part 108, in the holding state of the slide switch 100, the user only has to apply a small manual holding force F, so that the holding state of the slide switch 100 can be maintained without causing fatigue over a long period of time with the drive motor switched on for the continuous operation of the electric power tool 10 of fig. 1.

If the user releases the slide switch 100 unintentionally or in a controlled manner, the holding force F no longer acts on the slide switch 100, and the restoring spring 52 of fig. 2 pulls the slide switch 100 back from its holding state of fig. 4 via the sliding part 108 until the inoperative state of the slide switch 100 illustrated in fig. 3 is reached again and the drive motor of the electric power tool 10 of fig. 1 is switched off, wherein the edge 122 slides back via the holding surface 124 due to the lack of the holding force F and due to the force action of the restoring spring 52. In this case, the slide switch 100 first executes a longitudinal movement, which is superimposed on the tilting movement, relative to the longitudinal axis 32. The guide of the sliding switch 100 takes place here by means of the sliding geometry 106 in the form of the projection 116 and by means of the connecting geometry 110 and the edge 122 sliding along the inclined retaining surface 124 of the recess 126, which together form the retaining geometry 128.

In the following description, reference is made to fig. 5 and 6, which show a second embodiment of a slide switch 200 that can be used with the electric power tool 10 of fig. 1. The slide switch preferably has an operating side 202, which is preferably ergonomically designed and points away from the tool housing 24 of the electric power tool 10 of fig. 1, and a functional side 204, which has a slide geometry 206 and faces the tool housing 24. The sliding part 208 for the mechanical coupling of the sliding switch 200 with the electrical on/off switch 40 of fig. 2 has a connection geometry 210 for swingably coupling the sliding switch 200 on in a swing fulcrum 212.

The sliding geometry 206 is preferably formed by means of a spherical projection 216, shown in the figures, of the functional side 204, which projection 216 is guided on the tool housing 24, wherein the projection 216 has a preferably at least approximately semicircular cross-sectional geometry and is arranged in the region of a first axial end 218 of the sliding switch 200, which end faces the tool receptacle of the electric power tool 10 in fig. 1. When a user manually applies a retaining force F to the slide switch 200 perpendicular to the longitudinal axis 32, for example by means of a finger, in the region of the second axial end 220 of the slide switch 200 pointing away from the first axial end 218, the projection 222 pointing toward the tool housing 24 also forms a retaining geometry 230 in combination with the retaining surface 226 of the recess 228 of the tool housing 24, which is formed obliquely to the longitudinal axis 32, for locking the slide switch 200 in the retaining state when the drive motor is switched on. The contact surface 224 of the projection 222 and the retaining surface 226 of the recess 228 are each inclined by an angle α relative to the longitudinal axis 32, so that in the retaining state of the slide switch 200 shown in fig. 5 with the drive motor switched on, the contact surface 224 of the projection 222 at least partially contacts the retaining surface 226 of the recess 228 of the tool housing 24, preferably with a low retaining force F sufficient to maintain the retaining state permanently.

If the user releases the slide switch 200 in a controlled or, if necessary, uncontrolled manner, the contact surface 224 of the projection 222 slides along the holding surface 226 of the recess 228, while the slide switch 200 pivots about the pivot point 212 until the contact surface 224 of the projection 222 can be moved past the holding surface 226 of the recess 228 in the axial direction, so that the slide switch 200 can be moved back parallel to the longitudinal axis 32, starting from the holding state according to fig. 5, on the basis of the force effect of the restoring spring 52 of fig. 2, until the inoperative state shown in fig. 6 is reached, and the drive motor of the electric power tool 10 of fig. 1 is switched off. Here, the slide switch 200 slides along the tool housing 24 by means of its slide geometry 206 in the form of a semicircular projection 216. In the transition from the holding state to the inoperative state and vice versa, the slide switch 200 preferably executes a pivoting or tilting movement about the pivot point 212 in conjunction with a linear movement of the projection 216 on the tool housing 24 along the longitudinal axis 32.

In order that the slide switch 200 can be continuously held in the holding state with the drive motor 12 switched on in fig. 1 even with the application of a low holding force F and, with a controlled or uncontrolled release of the slide switch by the user, can be switched into the inoperative state in a timely and absolutely reliable manner for switching off the drive motor, a spacing a is preferably present between the apex 232 of the projection 216 and the contact surface 224 of the projection 222, while a predefined lever length L is preferably formed between the projection 216 and the second axial end 220 of the slide switch 200. The numerical ratio between the distance a and the lever length L is preferably between 0.2 and 0.8, including the corresponding interval boundaries. The angle α between the retaining surface 226 of the recess 228 in the tool housing 24 and the longitudinal axis 32 of the tool housing 24 is preferably between 35 ° and 85 ° with the interval boundaries included according to fig. 6. Here, the depression height H of the depression 228 of the tool housing 24 is preferably less than or equal to the height H of the projection 222 shown in the representation on the underside of the slide switch 200.

Fig. 7 shows another embodiment of a slide switch 300 that can be used with the electric power tool 10 of fig. 1. The slide switch preferably has an operating side 302, which is preferably ergonomically designed, and a functional side 304, which faces the tool housing 24, and which points away from the tool housing 24 of the electric power tool 10 from fig. 1. On the functional side 304 of the slide switch 300, the axial end edge 306 facing the tool holder 20 of fig. 1 serves at the same time as a sliding geometry 308 and as a pivot point 310. In the region of the axial end 312 of the sliding switch 300 pointing away from the end edge 306, a retaining geometry 314 is preferably formed, which, according to one embodiment, is formed by a projection 316 formed on the functional side 304 and a recess 318 formed in the tool housing 24. The protrusion 316 and the recess 318 are each configured to be inclined on one side. The detailed functional manner of the holding geometry 314 corresponds to the manner of operation of the holding geometry of the two first embodiments of the sliding switch 100 of fig. 3 and 4 and of the sliding switch 200 of fig. 5 and 6, so that the description of fig. 3 to 6 is referred to in order to avoid repetitions.

In the state shown in fig. 7, the slide switch 300 is in the inoperative state, so that the drive motor 12 of the electric power tool 10 of fig. 1 is switched off or de-energized. In the holding state with the switched-on drive motor, the projection 316 is preferably in at least partially form-locking engagement with the recess 318, so that this state can again be maintained by a holding force F to be applied manually by the user, preferably with a low force. The mechanical actuation of the electrical on/off switch 40 of fig. 2 takes place via a driver 320 which is integrally formed on the functional side 304 of the slide switch 300 and which is in turn engaged via a suitable connecting geometry 322 for actuating a slide element 324 of the electrical on/off switch.

Fig. 8 shows another embodiment of a slide switch 400 that can be used with the electric power tool 10 of fig. 1. In contrast to the embodiment of fig. 7, the slide switch has a sliding geometry 410, which is formed by a preferably semicircular spherical projection 408, on a functional side 404 opposite a preferably ergonomically designed actuating side 402 in the region of a first axial end 406 facing the tool holder 20 shown in fig. 1. The projection 408 is guided on a sliding ramp 412, shown concavely curved, which is preferably constructed integrally with respect to the tool housing 24. When switching between the non-operating state of the slide switch 400 indicated by the solid line to the holding state of the slide switch 400 indicated by the chain line under the action of the holding force F, the projection 408 slides on the slide slope 412. At the second axial end 414, a retaining geometry 416 is again formed on the functional side 404, which again corresponds in design and functional manner to the aforementioned retaining geometry.

Fig. 9 shows another embodiment of a slide switch 500 that can be used with the electric power tool 10 of fig. 1. The slide switch has an operating side 502 facing away from the tool housing 24 shown in fig. 1 and a functional side 504 facing the tool housing 24.

In contrast to the sliding switch embodiment illustrated in fig. 3 to 8, a projection 508 is provided in the region of the first axial end 506 facing the tool receptacle 24, which projection has an inclined contact surface 510 with respect to the longitudinal axis 32, which contact surface in turn forms a retaining geometry 516 in cooperation with a correspondingly inclined retaining surface 512 of a recess 514 of the tool housing 24. In the region of the second axial end 518, a preferably semicircular projection 520 is provided as a sliding geometry 522.

In the holding state shown in fig. 9, in which the drive motor of the power tool 10 shown in fig. 1 is switched on, the holding force F causes the contact surface 510 of the projection 508 to at least partially contact the holding surface 512 of the recess 514, as a result of which this state can be maintained by the user by overcoming the force of the return spring 52 of fig. 2 with a minimum force. If the user releases the slide switch 500, the inclined contact surface 510 of the projection 508 slides on the holding surface 512 of the recess 514 as a result of the force of the return spring 52 of fig. 2 until the projection 508 and the recess 514 are disengaged and the slide switch 500 reaches the inoperative state, indicated by the dash-dotted line, in which the drive motor of the electric power tool 10 shown in fig. 1 is switched off. The operation of the electrical on/off switch 40 shown in fig. 2 is in turn carried out by means of a sliding part 524 which is coupled by means of its connection geometry 526 with a driver 528 constructed on the functional side 504.

Fig. 10 illustrates another embodiment of a slide switch 600 that may be used with the power tool 10 of fig. 1, the slide switch illustratively having first and second axial ends 602, 604. The sliding member 606 for mechanically operating the electrical on/off switch of fig. 2 has a connection geometry 608 for swingably coupling the upper sliding switch 600 in a swing fulcrum 610. On a functional side 612 facing the tool housing 24 shown in fig. 1, the fulcrum 610 is preferably centrally located between the axial ends 602, 604. On both sides of the pivot point 610, first and second holding geometries 614,616 are arranged on a functional side 612 of the slide switch 600, which functional side, starting from the inoperative state shown here, maintains the holding state after reaching the holding state under a holding force F, wherein the holding force F acts on the slide switch 600 only in the region of the first or second holding geometries 612,614 or of the first or second axial ends 602,604, respectively. The retaining geometries 614,616 correspond in their design configuration and their functional manner to the retaining geometries already described above, so that reference can be made to the description of fig. 5 to 9 in respect of further design details.

In order to further facilitate the actuation of the slide switch 600, which is mounted so as to be pivotable in a two-armed manner about a pivot point 610 and axially displaceable in the direction of the arrow 618, the actuating side 620 preferably has in the region of the first axial end 602 and in the region of the pivot point 610 a ramp-like elevation 622,624, respectively, which can be felt tactually by the user and is ergonomically designed. Starting from the inoperative state of the slide switch 600 shown here, the slide switch can be brought into a holding state by the user by being pushed parallel to the longitudinal axis 32 in the direction of the arrow 618, the holding geometries 614,616 each entering their engagement state and being held in this engagement state continuously by the application of a holding force F on one side.

Fig. 11 illustrates another embodiment of a slide switch 700 that may be used with the power tool 10 of fig. 1, preferably having first and second axial ends 702, 704. The sliding element 706 for mechanically operating the electrical on/off switch 40 shown in fig. 2 has a connection geometry 708 for pivotably coupling the sliding switch 700 on in a pivot point 710. The pivot point 710 is preferably located in the region of the first axial end 702 on a functional side 712 facing the tool housing 24 shown in fig. 1. Unlike all the sliding switch embodiments described in fig. 3 to 10, the sliding switch 700 in the region of its functional side 712 has, by way of example, preferably three retaining geometries 714,716,718. In other respects, the functional manner and the design configuration of the retaining geometry 714,716,718 correspond to the retaining geometry of the sliding switch 100 of fig. 3 and 4 and of the sliding switch 200 of fig. 5 and 6, so that, in order to avoid repetitions, reference is made to the description of fig. 3 to 6.

Starting from the inoperative state illustrated in fig. 11 and the drive motor of the electric power tool 10 illustrated in fig. 1 being switched off, the holding state is reached by a translational movement of the slide switch 700 parallel to the longitudinal axis 32 in the direction of the arrow 720 and is maintained by the holding force F acting on the concave actuating side 722 facing away from the tool housing 24. In the holding state of the slide switch 700, all three holding geometries 714,716,718 are in engagement, as a result of which an excellent latching action is provided in the holding state of the slide switch 700 even with a low holding force F.

Fig. 12 illustrates another embodiment of a slide switch 800 that may be used with the power tool 10 of fig. 1, the slide switch illustratively having first and second axial ends 802, 804. A driver 808, preferably of integral design, is formed on the functional side 806 of the slide switch 800 facing the tool housing 24. The sliding part 810 has a connection geometry 812 for coupling the upper sliding switch 800 slightly swingably or tiltably relative to the longitudinal axis 32. The driver 808 is preferably positioned at least approximately centrally between the axial ends 802,804 on the functional side 806. On both sides of the driver 808 or of the first and second axial ends 802,804, first and second holding geometries 814,816 are arranged on the functional side 806 of the slide switch 800, which, starting from the inoperative state of the slide switch 800 shown here, maintains the holding state after reaching the holding state under a holding force F, wherein the holding force F acts on the slide switch 800 only in the region of the first or second holding geometries 814,816 or of the first or second axial ends 802,804, respectively. The retaining geometries 814,816 correspond in their design configuration and their functional manner to the retaining geometries already described above, so that other design details can likewise be referred to in the description of fig. 5 and 6.

In order to further facilitate the actuation of the pivotably and axially displaceably mounted sliding switch 800 in the direction of the arrow 818, the actuating side 820 has in the region of the first axial end 802 and in the region of the driver 808 in each case a ramp-like elevation 822,824 which is preferably easily perceptible by the user in the sense of touch and is preferably ergonomically designed. Starting from the inoperative state of the slide switch 800 shown here, the slide switch can be brought into a holding state by a user by moving it parallel to the longitudinal axis 32 in the direction of the arrow 818, the holding geometries 814,816 each entering their engagement state and being held in this engagement state continuously by the application of a holding force F on one side.

Fig. 13 shows another embodiment of a slide switch 850 that can be used with the power tool 10 of fig. 1. The slide switch has a square driver 856 for a slide element 858 on a functional side 854 of a motor housing 852, which faces a drive motor 12 of the electric hand power tool 10 shown in fig. 1. The sliding member 858 is in turn used for mechanically operating the electrical on/off switch 40 shown in fig. 2 via a sliding switch 850 and has for this purpose a connection geometry 860. The motor housing 852 has a radially inwardly directed projection 862 with a holding surface 864 embodied obliquely to the longitudinal axis 32.

A radially outwardly pointing projection 868 with an abutment surface 870 configured at least approximately in accordance with the inclination of the retaining surface 864 is preferably integrally formed on the end 866 of the sliding element 858 pointing away from the tool receptacle 20 shown in fig. 1. The retaining surface 864 of the motor housing-side projection 862 cooperates with the contact surface 870 of the sliding-part-side projection 868 to form a retaining geometry 872 for latching the sliding switch 850 in its retaining state, illustrated here by solid lines, in which a retaining force F to be exerted by a user acts on the actuating side 874 of the sliding switch 850 substantially perpendicularly to the longitudinal axis 32.

If the user releases the slide switch 850, the slide switch is automatically pulled back in the direction of the arrow 876, due to the later lack of the holding force F, in conjunction with the force of the restoring spring 52 shown in fig. 2, until the slide switch reaches the inoperative state of the slide switch 850, which is marked by a dash-dotted line, and the drive motor of the electric power tool 10 shown in fig. 1 is switched off. To reset the slide switch 850 from the inoperative state into the holding state and to hold it in the holding state, the slide switch 850 is moved in the direction of the arrow 876 substantially parallel to the longitudinal axis 32 until it reaches the holding state of the slide switch 850, indicated by solid lines, with the drive motor switched on and can be maintained by applying the holding force F. In the holding state of the slide switch 850, the holding geometry 872 is in the engaged state, i.e., the holding surface 864 of the projection 862 on the motor housing side comes to bear at least partially against the contact surface 870 of the projection 868 on the sliding part side. In other respects, the functional and design embodiment of the retaining geometry 872 follows, for example, that of the sliding switch described in fig. 5 and 6, so that, in order to avoid repetitions, reference is made to the description of fig. 5 and 6.

In order to further improve the operation of the slide switch 850, which can be pivoted or tilted and moved about the longitudinal axis 32, the actuating side 874 preferably has, in the region of the slide switch 850 facing the first axial end 878 of the tool holder 20 shown in fig. 1, an ergonomically designed, preferably ramp-shaped or one-sided concavely curved elevation 880, in particular for finger or thumb actuation. The raised portion terminates flat as shown on a second end 882 of slide switch 850 that points away from first axis end 878. In the region of the second axial end 882 of the slide switch 850, the functional side 854 acts at least partially as a sliding geometry abutting on the motor housing 852 for guiding the pivotable or reversible slide switch 850, so that a spherical projection of the functional side 854 as a sliding geometry is not necessary in this embodiment.

Referring concurrently to fig. 14-16 in the following description, fig. 14-16 illustrate another alternative embodiment of a slide switch 900 that may be used with the power tool 10 shown in fig. 1. The slide switch is shown with a slide member 606 shown in fig. 10 for mechanically operating the electrical on/off switch 40 shown in fig. 2 and with a connection geometry 608 shown in fig. 10 for pivotably coupling the slide switch 900 in an associated pivot point. The pivot point is arranged, like the pivot point 610 shown in fig. 10, on the functional side 902 of the slide switch 900 facing the tool housing 24 shown in fig. 1 and is positioned in the transition region between the functional side 902 and the connection geometry 608, which, however, is not separately designated for the sake of simplicity and clarity of the drawing.

The first axial end 910 of the slide switch 900 faces the tool receiving portion 20 of fig. 1. In the region of this end 910, a retaining hook 914 is formed on an actuating side 912 of the slide switch 900 which points away from the functional side 902 and which, in the retained state of the slide switch 900, can engage with a latching hook 916 which points radially inward and is formed in an opening 918 of the tool housing 24 in an at least partially form-locking manner. The retaining hook 914 of the slide switch 900 cooperates with the latching hook 916 of the tool housing 24 to form a retaining geometry according to the invention.

Preferably, in the region of the first axial end 910, a first ramp-shaped elevation 926, which is preferably ergonomically implemented, is preferably integrally formed on the operating side 912 of the slide switch 900 pointing away from the functional side 902. A second ramp-shaped elevation 930 of smaller height than the first ramp-shaped elevation is formed at a second axial end 928 of the slide switch 900 pointing away from the first axial end 910. In this way, an at least approximately concave profile of the actuating side 912 of the slide switch 900 is obtained between the elevations 926,930, which leads to a comfortable actuation by the user.

If the user now moves the sliding switch 900, starting from the inoperative state shown in fig. 14, in the direction of the arrow 932 parallel to the longitudinal axis 32 of the tool housing 24, the latching hook 914 is located below the retaining hook 916, as seen with reference to fig. 15, and the retaining geometry has almost reached its engagement state. Referring to fig. 16, the sliding switch 900 is moved axially parallel to the longitudinal axis 32 in the direction of the arrow 930 so far that the application of the holding force F on the user side causes the sliding switch 900 to pivot in such a way that the latching hook 914 catches the holding hook 916 from behind and the hook 914,916 is completely engaged when the drive motor of the electric power tool 10 shown in fig. 1 is switched on. This holding state can be maintained continuously and without causing fatigue with a small force by the action of the holding force F.

However, if the user releases the slide switch 900 again, controlled or uncontrolled, the holding force F is zero, and the slide switch 900 is pulled back, due to the force action of the restoring spring 52 shown in fig. 2 acting on the sliding part 606, from the holding state according to fig. 16 via the intermediate state of fig. 15 until the inoperative state according to fig. 14 is reached, in which the drive motor of the electric power tool 10 shown in fig. 1 is switched off, substantially parallel to the longitudinal axis 32 and in the direction of the arrow 930. In order to slide the slide switch 900 slightly toward the rear after it has been released, the retaining hook 914 on the slide switch 900 has a retaining surface 934 with a suitable inclination which slides past the latching hook 916 of the tool housing 24 when the slide switch 900 is released, i.e., when the retaining force F is removed, wherein the slide switch 900 simultaneously executes a pivoting movement in addition to its translational movement parallel to the longitudinal axis 32.

Claims

1. An electric power tool having a tool receptacle and a tool housing in which a drive motor for driving the tool receptacle is arranged, wherein a slide switch that is axially prestressed by means of a restoring spring is arranged on the tool housing for manually switching the drive motor on and off in a manner that can be moved longitudinally along a longitudinal axis of the tool housing and/or can be pivoted relative to the longitudinal axis, wherein at least one holding geometry is provided that is designed to hold the slide switch in a holding state when a predetermined holding force is manually applied to the slide switch by a user and to automatically place the slide switch in a rest state when the slide switch is released by the user, wherein the drive motor is switched on in the holding state and switched off in the rest state, an on/off switch in conductive connection with the drive motor is mechanically coupled to the slide switch via a sliding component having a connection geometry for the pivotable coupling of the slide switch on an associated pivot point,

a) the slide switch has an operating side facing away from the tool housing and a functional side facing the tool housing, wherein at least one sliding geometry and a driver for the sliding component are provided on the functional side, the sliding geometry being located on the functional side and being guided on the tool housing and being arranged in a first axial end region of the slide switch facing the tool receptacle,

b) the edge of the second axial end of the slide switch facing away from the tool receptacle, which edge points toward the tool housing, and the retaining surface of the recess in the tool housing, which retaining surface is inclined relative to the longitudinal axis of the tool housing, form the retaining geometry for locking the slide switch in the retaining state.

2. The electric power tool according to claim 1, characterized in that, instead of feature b), a projection directed toward the tool housing is formed on the slide switch axially spaced apart from the slide geometry in the direction of a second axial end of the slide switch facing away from the tool receptacle, wherein an abutment surface of the projection on the tool housing and a retaining surface of the recess in the tool housing, which is inclined in relation to the longitudinal axis of the tool housing in each case to this abutment surface, form the retaining geometry for locking the slide switch in the retaining state.

3. The electric power tool of claim 2, wherein the sliding geometry is comprised of protrusions.

4. The electric power tool of claim 3, wherein a space exists between the projection of the slide switch and the abutment surface of the projection.

5. The electric power tool according to claim 4, characterized in that a predefined lever length is formed between the projection of the slide switch and the second axial end, wherein the ratio between the distance and the lever length lies in a range between 0.2 and 0.8.

6. The power tool of claim 3, wherein an angle between the retaining surface of the recess in the tool housing and the longitudinal axis of the tool housing is between 35 ° and 85 °.

7. The electric power tool of claim 3, wherein a depressed height of the recess in the tool housing is less than or equal to a height of the projection of the slide switch.

8. An electric machine tool as claimed in claim 1, characterized in that, instead of features a) and b), a radially inwardly directed projection is formed on the motor housing associated with the drive motor, which projection has a holding surface inclined relative to the longitudinal axis of the tool housing, which holding surface forms the holding geometry with a correspondingly inclined contact surface of the radially outwardly directed projection on the sliding part relative to the tool housing.

9. The electric power tool according to claim 1, characterized in that, instead of features a) and b), a retaining hook is provided on a first axial end of the sliding switch facing the tool receptacle, which retaining hook can be latched onto a latching hook formed on the tool housing, wherein the retaining hook and the latching hook form the retaining geometry.