DE102019003733B4 - Hand machine tool and method for changing a working tool of a hand machine tool - Google Patents

Abstract

Hand machine tool (100), comprising a tool holder (108), in particular a spindle, for holding a working tool (110), a machine part (102) on which the tool holder (108) is arranged, a drive motor (112) for driving the tool holder (108), a guide body (104) for guiding the hand-held machine tool (100) on a workpiece surface, the machine part (102) being pivotably connected to the guide body (104), a depth stop (124, 166) for setting a stop position ( 154, 190) of the machine part (102) when it is pivoted relative to the guide body (104), a stop guide device (106, 158) for guiding the depth stop (124, 166), the depth stop (124, 166) being mounted on the stop guide device (106, 158 ) and is designed to be adjustable at a distance from the guide body (104),a switch element (126, 168) which is arranged on the depth stop (124, 166), the switch element (126, 168) being switchable between a first switch position (128 ), in which the depth stop (124, 166) can be displaced along the stop guide device (106, 158), and a second switching position (142) in which the depth stop (124, 166) is fixed on the stop guide device (106, 158) and the Tool holder (108) can be locked in a rotationally fixed manner in the stop position (154, 190) of the machine part (102), is designed to be transferrable, the machine part (102) having at least one locking element (146, 148, 180) which, by means of the switching element (126, 168) and at least one adjusting element (144, 176) can be transferred into a locked position, in which the tool holder (108) is locked in a rotationally fixed manner.

Description

technical field

The invention relates to a hand-held machine tool, comprising a tool holder, in particular a spindle, for holding a working tool, a machine part on which the tool holder is arranged, a drive motor for driving the tool holder, an unlocking switch and a guide body for guiding the hand-held machine tool a workpiece surface. It also relates to a method for changing a working tool of a hand-held machine tool.

State of the art

Such handheld power tools are known in principle in the prior art.

For example, describes the DE 10 2013 020 723 A1 a hand-held machine tool, in particular a sawing machine, with a tool holder arranged on a machine part for holding a work tool, in particular a saw blade, and with an in particular electric drive motor for driving the tool holder, the hand-held machine tool having a guide body, in particular a guide plate, for guidance a workpiece surface, wherein the machine part with the tool holder is movably mounted with respect to the guide body by means of a depth adjustment bearing between a first and at least a second depth position. The hand-held power tool has a safety device for securing the movement of the tool holder for a tool change of the working tool, the safety device being activated by an actuating element between a safety position in which the safety device mechanically blocks switching on of the drive motor and/or the tool holder against being driven by the drive motor , and an operating position, in which the drive motor and/or the tool holder are released for operation of the hand-held power tool, the hand-held power tool having a holding device with a first holding element for holding, in particular latching, the housing in the first depth position . The actuating element is movement-coupled to the first holding element in such a way that when the safety device is moved into the safety position with regard to the hold, in particular the latching, in the first depth position it is moved into a release position and the machine part with the tool holder is thus moved from the first depth position to the as Tool change position serving at least one second depth position is adjustable, in which the tool holder is accessible for changing the working tool.

The pamphlet DE 10 2015 015 640 A1 describes a machining device having a base with a contact surface adapted to be brought into contact with a workpiece, a machining device main body supported so that it can be moved toward and away from the base, an electric motor and a rotary blade configured to be rotated by the electric motor as a drive source and configured to be moved toward the base to cause the rotary blade to protrude from the contact surface of the base for machining the workpiece, and a stopper device configured to limit a movable position of the processing device main body toward the base, and having a fine adjustment mechanism configured to allow manual adjustment of the movable position of the processing device main body toward the base.

Furthermore, US 2013/0 318 801 A1 discloses a circular sawing machine that can be used in two different operating modes. The circular saw machine comprises a tool body, an attachment means which, in use, enables a circular saw blade to be attached to the tool body, and a base plate associated with the tool body for supporting the tool body, in use, on a workpiece or surface, said tool body being arranged to capable of pivotal movement relative to said base plate to enable a circular saw blade, in use, to be pivoted to a desired depth of cut relative to a workpiece. Furthermore, guide means are provided for guiding the movement of the tool body relative to the base plate in each of the different modes of operation; there being provided a single mode selection means for enabling the selection of the different modes of operation for each different mode of operation, at least part of the single mode selection means being movable with respect to the guide means when moving the tool body between the different modes of operation;

Furthermore describes the EP 2 045 055 A2 a hand tool having a tool housing translatably or pivotally attached to a footplate; a rotatable cutting blade whose axis of rotation is fixed with respect to the housing; an electric motor for driving the saw blade; an electrical switch, which can be switched manually using a switch button, to power the motor; and a latch for controlling movement of the housing with respect to the footplate. The latch has a manually operable control button mounted on either the housing or the footplate. The control knob interacts with a channel which is fixed with respect to the rest of the housing or footplate to allow the control knob to select between different modes of operation.

The known hand-held power tools do a good job in their basic function, but are unfortunately relatively complicated, cumbersome and/or expensive to operate. Especially when changing a work tool, for example a

Saw blade, relatively many steps must be performed and conditions are met before the work tool can be removed from the hand machine tool.

Presentation of the invention

The object of the invention is to create a hand-held power tool that enables simple and efficient operation.

The object is achieved by the features of claim 1. The invention includes a hand-held machine tool with a tool holder, in particular a spindle, for holding a working tool, a machine part on which the tool holder is arranged, a drive motor for driving the tool holder, and a guide body for guiding the hand-held machine tool on a workpiece surface. wherein the machine part is pivotably connected to the guide body, a depth stop for setting a stop position of the machine part when pivoting relative to the guide body, and a stop guide device for guiding the depth stop, the depth stop being arranged on the stop guide device and being designed to be adjustable at a distance from the guide body. In addition, the handheld power tool according to the invention comprises a switching element, which is arranged on the depth stop, the switching element between a first switching position, in which the depth stop can be displaced along the stop guide device, and a second switch position, in which the depth stop is fixed on the stop guide device and the Tool holder in the stop position of the machine part can be locked in a rotationally fixed manner, is designed to be transferrable.

As a result, the technical advantage is achieved, for example, that the tool holder can be locked at any stop position of the machine part, which is set as desired, and thus a simple and quick change of the working tool is possible. In addition, any cutting depth can be checked with a significantly reduced risk of injury, since the tool holder can also be used to lock the working tool in any adjustable position.

In the following, setting the stop position means both setting the position of the machine part and setting a position of the depth stop itself relative to the guide body.

A working tool is to be understood as an object that does not belong permanently to the hand-held power tool, which can be attached to the tool holder and with the help of which a direct goal of the hand-held power tool is achieved. For example, the working tool is in the form of a saw blade in order to cut or saw up a workpiece.

The drive motor is preferably an electric motor for driving the tool holder and thus the working tool. It can also be operated with a battery, for example.

The guide body is preferably a plate or other body with a flat surface, and at the same time forms a kind of base for arranging or attaching the machine part and the stop guide device. The guide body is guided along the surface of the workpiece when the hand-held power tool is actuated in a purposeful manner, with the flat surface lying against the workpiece.

The machine part is a component of the handheld power tool that is pivotably connected to the guide body and to which the drive motor and the tool holder are attached. The machine part is connected to the guide body by means of a pivot axis in order to guide the work tool, which is arranged rotatably on the tool holder, onto and into the workpiece.

A depth stop within the meaning of the invention is to be understood as a component whose position can be adjusted, the set position defining a stop position of the machine part and thereby a cutting depth of the working tool in the workpiece.

The stop guide device is a component that supports the depth stop, along which the depth stop moves into a desired Position can be guided and fixed there. The stop guide device is firmly connected to the guide body.

According to a preferred embodiment, the handheld power tool has an unlocking switch for mechanically blocking an on/off switch, the machine part having a blocking element which mechanically blocks the unlocking switch when the switching element is transferred to the second switching position and the machine part is arranged in the stop position. In this case, the blocking element is preferably designed with a switch-off lever, which blocks an unlocking function of the unlocking switch, in particular a latching means to be released for unlocking the unlocking switch. The second switching position of the switching element thus includes an additional functionality and makes the operation and handling of the handheld power tool even easier and safer.

According to a special embodiment, the depth stop has a spring-loaded latching element. In this case, the latching element can preferably be unlocked using a push button. In this way, the machine part can be fixed easily and quickly in its pivoting position relative to the guide body. Likewise, the latching element can be disengaged very easily by pressing the push button and releasing the latching element against the spring force. This releases the machine part.

In addition, the spring-loaded latching element is preferably arranged on the switching element. As a result, a fixing function for the machine part is assigned to a specific, preferably the second, switching position of the switching element, and a further functionality is thus integrated into the switching element.

According to an additional embodiment, a rotary knob for fine adjustment of the stop position is arranged on the depth stop. By turning the rotary knob, the depth stop can be displaced in a controlled manner by very small distances along the stop guide device, and a more precise position adjustment of the depth stop can thus be undertaken.

In addition, the turning knob preferably has a toothed wheel or a worm wheel which is in engagement with a curved toothed rack on the fence guide device. As a result, the knob and rack form a toothed or worm gear, which is particularly suitable for fine adjustment. In particular, the worm gear allows a particularly precise fine adjustment of the depth stop.

According to a further embodiment, the depth stop is associated with a spring element in order to clamp the depth stop on the stop guide device with an elastic spring force. The spring element is preferably designed with a leaf spring, with the depth stop and the leaf spring preferably being arranged on opposite sides of the stop guide device and being connected by means of a connecting element, preferably a screw, leading through the stop guide device. By means of clamping by the spring element, it is possible to fix the depth stop in a set stop position in a manner that is easy to handle.

According to the invention, the depth stop is advantageously designed with a grip element, the depth stop being displaceable by actuating the grip element against the elastic spring force of the spring element along the stop guide device. When the grip element is actuated, the depth stop is preferably at least partially spaced from the stop guide device and is thereby released from the engagement of the worm wheel or any other non-slip fixing device. After the stop position has been shifted or reset, the depth setting can be fixed again simply by releasing the grip element. As a result, the worm wheel re-engages with the curved toothed rack. The arrangement of the spring and grip element thus represents a particularly simple and efficient way of setting the stop position for a user.

The depth stop is preferably clamped in both switching positions of the switching element by the spring force of the spring element on the stop guide device. Jamming of the depth stop is preferably ensured with the aid of the already mentioned detent or other non-slip fixing device. The depth stop is jammed by the spring force during initial assembly or immediately after the stop position of the depth stop has been set, ie while the switching element is in the first switching position. If the switching element is transferred or has been transferred to the second switching position, the depth stop remains clamped on the stop guide device in the same way. The advantages of jamming or clamping with the help of the spring element listed above also apply here.

According to a particular embodiment, the switching element can be converted into a third switching position, which is arranged between the first switching position and the second switching position, the depth stop being in the third switching position tion is fixed to the stop guide device. The third switching position forms a functional intermediate stage between the first and second switching position. In a preferred exemplary embodiment, in the third switch position, on the one hand, the depth stop can no longer be displaced along the stop guide device, as in the first switch position, and, on the other hand, the tool holder is not yet locked in a non-rotatable manner in the stop position of the machine part, as in the second switch position. Due to the third switching position, a clearly visible and unambiguous gradation of the functionalities of the switching element is implemented. The third switch position corresponds, for example, to the operating position. Here the switching element is fixed to the stop guide device, as a result of which the machine part can be brought into the stop position and the entire hand-held power tool can be operated.

According to a further embodiment, the machine part has at least one locking element, which can be transferred into a locked position by means of the switching element and at least one adjustment element, in which position the tool holder is locked in a rotationally fixed manner. In this case, the locking element is preferably arranged in the blocking position precisely when the switching element is transferred into the second switching position and the machine part is arranged in the stop position. A tensile or compressive force acts on the locking element by means of the adjustment element, as a result of which this is transferred into the blocking position. In this way, the tool holder can be locked quickly and easily. It should be noted that this is at least one locking element. It is also possible, for example, for two locking means to be transferred into a combined locking position by means of the adjustment element in order to lock the tool holder.

The adjusting element is preferably designed here as a magnet or a compression spring. The magnet is preferably designed as a permanent magnet. The compression spring is preferably attached to a bolt and is designed to press a latching means against the locking element. However, other configurations of the adjustment element are also possible.

According to a further embodiment, the machine part has a projection which is designed so that it can be brought into engagement with the depth stop in order to hold the machine part in the stop position. The projection is preferably arranged on the machine part in such a way that when the machine part is pivoted into the stop position, it is first guided past the switching element and then strikes the depth stop. The machine part can then be fixed, for example, by the switching element being or being transferred to the second switching position, thereby forming or bringing about a barrier which blocks the machine part from pivoting back from the stop position. Particularly preferably, however, the projection is arranged on the machine part such that it can be pivoted or displaced and is designed to be spring-loaded. As a result, the projection snaps under the depth stop or into an opening in the depth stop as soon as the machine part has reached the stop position. In this way, the machine part can be fixed in its pivoted position relative to the guide body in a simple, quick and reliable manner.

With regard to a further aspect of the present invention, the object is achieved by a method for changing a working tool of a hand-held power tool according to one of the preceding embodiments. Accordingly, the method includes the steps of transferring the machine part to the stop position, transferring the switching element to the second switching position, and changing the working tool.

The advantages of the method according to the invention correspond in a similar form to the advantages of the hand-held power tool according to the invention, whereby, for example, the tool holder can be locked at any set stop position of the machine part and thus a simple and quick change of the working tool is possible.

According to a particular embodiment, when the switching element is moved into the second switching position, the tool holder is locked in a rotationally fixed manner, with a locking element being moved into a position locking the tool holder in a rotationally fixed manner by means of an adjusting element. As already mentioned, the tool holder is locked in a particularly simple and quick manner in this way, with safety aspects in particular being taken into account.

Further advantageous embodiments and combinations of features of the invention result from the following detailed description and the entirety of the patent claims.

character list

• 1 eine erste Seitenansicht einer ersten Ausführungsform einer erfindungsgemäßen Hand-Werkzeugmaschine in einer Ausgangseinstellung,
• 2a das Detail II gemäß 1 mit einem Schaltelement in einer ersten Schaltposition,
• 2b das Detail II gemäß 1 mit dem Schaltelement in einer zweiten Schaltposition,
• 3 das Detail III gemäß 1,
• 4 die Hand-Werkzeugmaschine aus 1 in einer Arbeitswerkzeug-Wechseleinstellung,
• 5 das Detail V gemäß 4,
• 6 eine erste Seitenansicht einer zweiten Ausführungsform einer erfindungsgemäßen Hand-Werkzeugmaschine in einer Ausgangseinstellung,
• 7a das Detail VII gemäß 6 mit einem Schaltelement in einer ersten Schaltposition,
• 7b das Detail VII gemäß 6 mit dem Schaltelement in einer dritten Schaltposition,
• 7c das Detail VII gemäß 6 mit dem Schaltelement in einer zweiten Schaltposition,
• 8 das Detail VIII gemäß 6,
• 9 die Hand-Werkzeugmaschine aus 6 in einer Arbeitswerkzeug-Wechseleinstellung,
• 10 das Detail X gemäß 9 in einer Längsschnitt-Darstellung,
• 11 eine zweite Seitenansicht der erfindungsgemäßen Hand-Werkzeugmaschine gemäß 1 oder 6,
• 12 eine schematische Rückseiten-Teilansicht einer erfindungsgemäßen Anschlagführungseinrichtung aus 1, und
• 13 eine schematische Rückseiten-Teilansicht einer erfindungsgemäßen Anschlagführungseinrichtung aus 6.

The drawings used to explain the embodiment show:

• 1 a first side view of a first embodiment of a hand-held power tool according to the invention in an initial setting,
• 2a the detail II according to 1 with a switching element in a first switching position,
• 2 B the detail II according to 1 with the switching element in a second switching position,
• 3 the detail III according to 1 ,
• 4 the hand machine tool 1 in a work tool change setting,
• 5 the detail V according to 4 ,
• 6 a first side view of a second embodiment of a hand-held power tool according to the invention in an initial setting,
• 7a the detail VII according to 6 with a switching element in a first switching position,
• 7b the detail VII according to 6 with the switching element in a third switching position,
• 7c the detail VII according to 6 with the switching element in a second switching position,
• 8th the detail VIII according to 6 ,
• 9 the hand machine tool 6 in a work tool change setting,
• 10 the detail X according to 9 in a longitudinal section representation,
• 11 according to a second side view of the handheld power tool according to the invention 1 or 6 ,
• 12 a schematic rear partial view of a stop guide device according to the invention 1 , and
• 13 a schematic rear partial view of a stop guide device according to the invention 6 .

In principle, the same parts are provided with the same reference symbols in the figures.

Ways to carry out the invention

The 1 shows a handheld power tool 100 in a first embodiment and in an initial setting. The hand-held power tool 100 includes a machine part 102 , a guide body 104 and a stop guide device 106 . The machine part 102 comprises a tool holder 108 with a working tool 110, here a spindle with a saw blade, and a drive motor 112 (not shown here) for driving the tool holder 108, and an unlocking switch 114 for mechanically blocking the on/off switch. In addition, a locking mechanism 116 is arranged on the machine part 102 between the tool holder 108 and the stop guide device 106, which will be described in more detail later. The machine part 102 is pivotably connected to the guide body 104 by means of a pivot axis 118 . The stop guide device 106 is fixedly arranged on the guide body 104 . The stop guide device 106 comprises a curved toothed rack 120 and a guide gap 122 on which a depth stop 124 is arranged in a displaceable manner. The depth stop 124 has a switching element 126, which is located here in a first switching position 128 and is described in more detail below.

The hand-held power tool 100 of the first embodiment is ready for operation in the initial setting shown because the depth stop 124 is already fixed here. The machine part 102 can thus be pivoted about the pivot axis 118 in the direction of the guide body 104 until the machine part 102 strikes the depth stop 124 . The on/off switch of the drive motor 112 can then be unlocked mechanically by means of the unlocking switch 114 and the hand-held power tool 100 can be guided over a workpiece surface by means of the guide body 104 .

The 2a shows the depth stop 124 1 with the switching element 126 in a first switching position 128. For the sake of clarity, here and in the following 2 B the toothed rack 120 and the guide gap 122 of the stop guide device 106 are also shown in a partial view. In addition to the switching element 126, the depth stop 124 has a rotary knob 130 connected to a worm wheel 132 (not visible here), a gripping element 134, here in the form of a pulling lever, and a spring element 136 (not visible here), here in the form of a leaf spring. Spring element 136 is arranged behind stop guide device 106 and is connected to depth stop 124 through guide gap 122, shown in FIG 12 . A push button 138 is also arranged on the switching element 126, which is coupled to a spring-loaded latching element 140--not visible here--which is also arranged on the switching element 126 here.

In the first switching position 128 of the switching element 126, the depth stop 124 is clamped by means of a spring force of the spring element 136 on the stop guide device 106 and is thereby fixed in its position, supported by the worm gear 132 engaging in the toothed rack 120. By actuating or pulling the handle element 134 the depth stop 124 can be displaced against the spring force of the spring element 136 along the stop guide device 106, more precisely along the guide gap 122. the beauty ckenrad 132 is released from the rack 120 or disengaged. The depth stop 124 can be fixed at a desired position by releasing the grip element 134 . The position of the depth stop 124 can then be fine-tuned by turning the rotary knob 130 . The fine adjustment is possible by means of the worm wheel 132 which is connected to the turning knob 130 and which, together with the toothed rack 120, forms a worm wheel gear. The function of the push button 138 and the spring-loaded latching element 140 will be discussed later.

The 2 B shows the depth stop 124 1 with the switching element 126 in a second switching position 142. Apart from the switching position 142, the depth stop 124 is the same here in 2 B the in 2a . In the second switching position 142 of the switching element 126, the depth stop 124 is fixed in its position and can no longer be displaced or adjusted by means of the rotary knob 130. Further effects of the second switching position 142 are explained in the descriptions 4 and 5 executed.

The 3 12 shows the locking mechanism 116. FIG 1 in an initial setting, in which the locking mechanism 116 includes an adjustment element 144, designed here as a compression spring, and a first locking element 146 and a second locking element 148. The first locking element 146 is designed as a rotary locking element and the second locking element 148 is designed as a locking disk placed on the tool holder 108 . In addition, 3 a projection 150 and a switch-off lever 152 visible, to which later in the description 10 is still received.

The 4 shows the hand-held power tool 100 1 in a work tool change setting. The components shown therefore fully correspond to those in 1 . However, this one is in 4 illustrated work tool change setting characterized in that the switching element 126 is in the second switching position 142, as already in 2 B shown, and that the machine part 102 is guided into a stop position 154 . In the stop position 154, the machine part 102 rests against the depth stop 124, as a result of which a cutting depth for the working tool 110 is defined. To change the working tool 110, the switching element 126 must be in the second switching position 142, since only then is the tool holder 108 and thus also the working tool 110 locked in a rotationally fixed manner. The corresponding locking mechanism 116 in the work implement change setting is described in more detail below.

The 5 12 shows the locking mechanism 116. FIG 4 in the work tool change setting. A partial view of the depth stop 124 is shown with the switching element 126 in the second switching position 142, the adjustment element 144, and the two locking elements 146 and 148. The switching element 126 rests on the adjustment element 144, which is designed as a compression spring, whereby this moves in the direction of the first locking element 146 is pressed. As a result, the first locking element 146 embodied as a rotary locking element is locked with the second locking element 148 embodied as a locking disk, and the tool holder 108 is thus locked in a rotationally fixed manner. In addition, 5 the pushbutton 138 arranged on the switching element 126 is shown, which is coupled to the spring-loaded latching element 140 (not visible).

The 6 shows a handheld power tool 100 in a second embodiment and in an initial setting. The hand-held machine tool 100 is similar to the hand-held machine tool 100 according to FIG 1 , And also has a machine part 102, a guide body 104 and--albeit of a different type--stop guide device 158. A tool holder 108, a working tool 110--not shown here--a drive motor 112, an unlocking switch 114, a locking mechanism 160--albeit of a different type--and a pivot axis 118 are included again. As already indicated, the handheld power tool 100 differs in the here in 6 illustrated second embodiment in the construction of the stop guide device 158 and the locking mechanism 160 from the first embodiment.

The stop guide device 158 includes a toothed rack 162 which is integrated into a guide gap 164 . A depth stop 166 is displaceably arranged on the toothed rack 162 and the guide gap 164 and has a switching element 168 which is in the first switching position 128 here. The depth stop 166 will be discussed in more detail below. The locking mechanism 160 will also be described later in more detail.

The hand-held power tool 100 of the second embodiment in the initial setting shown is not yet ready for operation because the depth stop 166 is not yet fixed in the first switching position 128 of the switching element 168 . The reference numeral of the first switching position 128 is retained throughout the entire description of the figures, since the switching position 128 represents a basic switching element starting position in all of the embodiments.

The 7a shows the depth stop 166 6 with the switching element 168 in the first switching position 128. For the sake of clarity, here and in the following 7b and 7c a portion of the toothed rack 162 and the guide gap 164 of the stop guide device 158 is also shown. In addition to the switching element 168, the depth stop 166 has a rotary knob 170 connected to a toothed wheel 172--not yet visible here--and a guide element 174, which is guidably arranged in the guide gap 164--not yet visible here. The switching element 168 itself also has an adjustment element 176, which is designed here as a magnet and is inserted into the switching element 168.

In the first switching position 128 of the switching element 168, the depth stop 166 can be displaced along the stop guide device 158, more precisely along the guide gap 164. The position of the depth stop 166 can also be adjusted and fine-tuned by turning the rotary knob 170 . The setting is realized by means of the gear wheel 172 which is connected to the rotary knob 170 and which, together with the toothed rack 162, forms a gear mechanism.

The 7b shows the depth stop 166 6 with the switching element 168 in a third switching position 178. The term “third” switching position 178, which can be misleading under certain circumstances, is to be understood here as an intermediate switching element position. Apart from this switch position 178, the depth stop 166 here in 7b the in 7a .

In the third switching position 176 or the switching element intermediate position of the switching element 168, the depth stop 166 is fixed in its set position on the stop guide device 158 and can no longer be displaced or adjusted by means of the rotary knob 170. The depth stop 166 is fixed by pulling the guide element 174 when switching the switching element 168 from the first switching position 128 to the third switching position 178, as a result of which the guide element 174 is fixed in the guide gap 164. The description refers to the fixing of the depth stop 166 again 13 received.

The 7c shows the depth stop 166 6 with the switching element 168 in the second switching position 142. The reference numeral of the second switching position 142 is retained throughout the description of the figures, since the switching position 142 represents a basic switching element end position in all embodiments. Apart from the switch position 142, the depth stop 166 here in 7c the in the 7a and 7b .

In the second switching position 142 of the switching element 168, the depth stop 158 is still fixed, as for 7b already described. In addition, the adjusting element 176 is now used. The effect of the adjusting element 176 and other effects of the second switching position 142 are explained in the descriptions 9 and 10 listed.

The 8th 16 shows the locking mechanism 160. FIG 6 in the initial setting, which includes a locking element 180 . The locking element 180 can be displaced radially with respect to the tool holder 108 and has a link opening 182 through which the tool holder 108 is arranged. Link opening 182 is divided into a wide opening section 184 and a narrow opening section 186 . In the initial setting of the locking mechanism 160 shown here, the tool holder 108 is freely rotatably arranged in the wide opening section 184 . The locking element 180 also has an effective area 188 which contains a material which reacts attractively to magnetism. Alternatively, however, the entire locking element 180 can also be made of such a magnetic material as, for example, iron, cobalt or nickel. In addition, 8th the - already in 3 designated - switch-off lever 152 visible, which will be discussed later.

The 9 shows the hand-held power tool 100 6 in a work tool change setting. The components shown therefore fully correspond to those in 6 . However, this one is in 9 illustrated work tool change setting characterized in that the switching element 168 is in the second switching position 142, as already in 7c shown, and that the machine part 102 is guided into a stop position 190 .

In the stop position 190, the machine part 102 rests against the depth stop 166, as a result of which a cutting depth for the working tool 110 is defined. To change the working tool 110, the switching element 168 must be in the second switching position 142, since only then is the tool holder 108 and thus the working tool 110 locked in a rotationally fixed manner. The corresponding locking mechanism 160 in the work tool change setting will be described in the description 10 explained.

Both in the second embodiment shown here and in 1 and 4 illustrated first embodiment, the hand Machine tool 100 has a locking mechanism 192, of which only the associated switch-off lever 152 is visible here. The locking mechanism 192 is referred to in the description 10 received.

The 10 12 shows the locking mechanism 160 and the locking mechanism 192. FIG 9 in the work tool change setting. The locking mechanism 192 is visible here due to the depiction of a longitudinal section of the machine part 102 . In addition, here in 10 the - already in 3 designated - projection 150 visible, which will be discussed following the description of the locking mechanism 160 and the locking mechanism 192.

The adjusting element 176, which is arranged in the switching element 168 and is designed as a magnet, is in contact with the effective region 188 of the locking element 180. Due to a magnetic force of attraction between the adjusting element 176 and the effective area 188, the switching element 168 and the locking element 180 are held together. As a result, the locking element 180 is in a position that is shifted from the initial setting, so that the tool holder 108 is now arranged in the narrow opening section 186 of the connecting link opening 182 and is thus locked in a rotationally fixed manner.

The locking mechanism 192 includes the switch-off lever 152, which is also shown in 3 and 8th is shown and labeled. In the working tool change setting shown here, in which the switching element 168 is in the second switching position 142 and the machine part 102 is guided into a stop position 190 against the depth stop 166, the switch-off lever 152 is located on the switching element 168 or on the one with the switching element 168 associated adjusting element 176. The switch-off lever 152 is arranged shifted in the direction of the machine part 102 for the initial setting, as a result of which a locking element 198 is fixed via a sliding element 194 and a transmission unit 196 . A safety device 200 that is to be actuated by means of the unlocking switch 114 and has an unlocking function or unlocking function is blocked due to the fixed locking element 198 .

The projection 150 fixes the machine part 102 in its stop position 190, provided that the switching element 168 is set in the second switching position 142, as here. Since the projection 150 is thus arranged below the switching element 168, the switching element 168 forms a barrier which blocks the machine part 102 from pivoting back from the stop position 190.

The 11 shows the hand-held power tool 100 1 or 6 from one in 1 or 6 opposite side. Since both the first embodiment and the second embodiment of the hand-held power tool 100 can be involved here, identical designations or reference symbols are only listed in both embodiments. The machine part 102, the guide body 104, the tool holder 108, the working tool 110 and the unlocking switch 114 are shown again 11 a protective housing 202 with a mounting opening 204 is shown. The assembly opening 204 is shown here as rather small, but can extend over an entire pivoting radius 206 of the tool holder 108 so that the working tool 110 can be changed in any position of the machine part 102 .

As additions to the two embodiments described are in the 12 and 13 Partial rear views of the respective stop guide devices 106, 158 are shown.

The 12 FIG. 14 shows a partial rear view of the stop guide device 106. FIG 1 . You can see the guide gap 122, the depth stop 124 and the spring element 136 designed as a leaf spring. The spring element 136 is here in 12 visible for the first time since it is arranged on the back of the stop guide device 106 . In this case, the depth stop 124 and the spring element 136 are arranged on opposite sides of the stop guide device 106 and are connected by means of a connecting element 208 leading through the guide gap 122, in this case a screw. The depth stop 126 is held in a set position on the stop guide device 106 by means of the spring force of the spring element 136 . The worm wheel 132 engaging in the toothed rack 120 provides additional support here.

The 13 FIG. 14 is a partial rear view of fence guide assembly 158. FIG 6 . The toothed rack 162, the guide gap 164 and the depth stop 166 can be seen. The gear wheel 172 and the guide element 174 are also shown and here in 13 visible for the first time. A first guide groove 210 and a second guide groove 212, by means of which the guide element 174 can be guided along the guide gap 164, are arranged inside the stop guide device 158 and starting from the guide gap 164.

As already mentioned, the toothed wheel 172 together with the rack 162 forms a toothed wheel gear for setting the position of the depth stop 166. The guide element 174 ensures guidance of the depth stop 166 along the guide gap 164. In addition, the guide element 174 contributes to a possible fixation of the depth stop 166 on the stop guide device 158. When the depth stop is transferred to a setting that deviates from the initial setting, for example to the work tool change setting, the guide element 174 is pulled up to the depth stop 166 . As a result, the guide element is firmly applied to the inner walls of the guide grooves 210, 212, and the depth stop 166 is thus fixed in its position.

In summary, it can be stated that the embodiments of the hand-held power tool according to the invention can be combined with one another. None of the features disclosed excludes the combination with another feature and individual combinations of features interact with one another and form synergetic effects.

Reference List

100

hand machine tool

102

machine part

104

guide body

106

fence guide device

108

tool holder

110

working tool

112

drive motor

114

unlock switch

116

locking mechanism

118

pivot axis

120

rack

122

guide gap

124

depth stop

126

switching element

128

first switch position

130

knob

132

worm wheel

134

grip element

136

spring element

138

push button

140

spring-loaded locking element

142

second switch position

144

adjustment element

146

first locking element

148

second locking element

150

head Start

152

switch-off lever

154

stop position

158

fence guide device

160

locking mechanism

162

rack

164

guide gap

166

depth stop

168

switching element

170

knob

172

gear

174

guide element

176

adjustment element

178

third shift position

180

locking element

182

scenery opening

184

wide opening section

186

narrow opening section

188

effective range

190

stop position

192

locking mechanism

194

sliding element

196

transmission unit

198

blocking element

200

security device

202

protective housing

204

mounting hole

206

swing radius

208

fastener

210

guide groove

212

guide groove

Claims (14)

Hand-held machine tool (100), comprising a tool holder (108), in particular a spindle, for holding a working tool (110), a machine part (102) on which the tool holder (108) is arranged, a drive motor (112) for driving the Tool holder (108), a guide body (104) for guiding the hand-held power tool (100) on a workpiece top surface, the machine part (102) being pivotably connected to the guide body (104), a depth stop (124, 166) for setting a stop position (154, 190) of the machine part (102) when it is pivoted relative to the guide body (104), a stop guide device (106, 158) for guiding the depth stop (124, 166), wherein the depth stop (124, 166) is arranged on the stop guide device (106, 158) and is designed to be adjustable at a distance from the guide body (104), a switching element (126 , 168) which is arranged on the depth stop (124, 166), the switching element (126, 168) being displaceable between a first switching position (128) in which the depth stop (124, 166) can be displaced along the stop guide device (106, 158). and a second switching position (142) in which the depth stop (124, 166) is fixed to the stop guide device (106, 158) and the tool holder (108) can be locked in a rotationally fixed manner in the stop position (154, 190) of the machine part (102). , is designed to be transferrable, wherein the machine part (102) has at least one locking element (146, 148, 180) which can be transferred into a locked position by means of the switching element (126, 168) and at least one adjustment element (144, 176), in which the Tool holder (108) is locked in a rotationally fixed manner. Hand machine tool (100) after claim 1 , characterized in that the hand-held power tool (100) has an unlocking switch (114) for mechanically blocking an on/off switch, the machine part (102) having a blocking element (198) which mechanically blocks the unlocking switch (114) when the switching element (126, 168) into the second switching position (142) and the machine part is arranged in the stop position (154, 190). Hand-held power tool (100) according to one of the preceding claims, characterized in that the depth stop (124, 166) has a spring-loaded latching element (140). Hand-held power tool (100) according to one of the preceding claims, characterized in that the spring-loaded latching element (140) is arranged on the switching element (126, 168). Hand-held power tool (100) according to one of the preceding claims, characterized in that a rotary knob (130, 170) for fine adjustment of the stop position (154, 190) is arranged on the depth stop (124, 166). Hand machine tool (100) after claim 5 , characterized in that the rotary knob (130, 170) has a gear (172) or a worm wheel (132) which engages with a curved toothed rack (120, 162) on the fence guide device (106, 158). Hand-held power tool (100) according to one of the preceding claims, characterized in that the depth stop (124, 166) is assigned a spring element (136) in order to hold the depth stop (124, 166) on the stop guide device (106, 158) with an elastic clamp spring force. Hand machine tool (100) after claim 7 , characterized in that the depth stop (124, 166) is designed with a grip element (134), the depth stop (124, 166) being moved by actuating the grip element (134) against the elastic spring force of the spring element (136) along the stop guide device (106 , 158) can be moved. Hand machine tool (100) after claim 7 or 8th , characterized in that the depth stop (124, 166) is clamped in both switching positions (128, 142) of the switching element (126, 168) by the spring force of the spring element (136) on the stop guide device (106, 158). Hand machine tool (100) according to one of Claims 1 until 6 , characterized in that the switching element (126, 168) can be transferred into a third switching position (178), which is arranged between the first switching position (128) and the second switching position (142), the depth stop (124, 166) in the third switching position (178) on the stop guide device (106, 158) and the tool holder (108) in the stop position (154, 190) of the machine part (102) is non-rotatably lockable. Hand machine tool (100) after claim 10 , characterized in that the adjusting element (144, 176) is designed as a magnet or a compression spring. Hand-held power tool (100) according to one of the preceding claims, characterized in that the machine part (102) has a projection (150) which is designed to be engageable with the depth stop (124, 166) in order to rotate the machine part (102) in to hold the stop position (154, 190). Method for changing a working tool (110) of a hand-held machine tool (100) according to one of Claims 1 until 12 , with the steps: - transferring the machine part (102) to the stop position (154, 190), - transferring the switching element (126, 168) to the second switching position (142), and - changing the working tool (110). procedure after Claim 13 , characterized in that when the switching element (126, 168) is transferred into the second switching position (142), the tool holder (108) is locked in a non-rotatable manner, with a locking element (146, 148, 180) being is moved into a position locking the tool holder (108) in a rotationally fixed manner.

Images