CN108262721B

CN108262721B - Machine tool with a switching device

Info

Publication number: CN108262721B
Application number: CN201810161195.6A
Authority: CN
Inventors: A·乌尔里希; H·弗勒林
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2012-12-20
Filing date: 2013-12-20
Publication date: 2021-08-27
Anticipated expiration: 2033-12-20
Also published as: DE102012223931A1; CN103878752B; CN103878752A; CN108262721A

Abstract

The invention relates to a power tool having a switching device with a main switch and a locking switch, which is received in a guide track formed between two housing half-shells of a housing of the power tool.

Description

Machine tool with a switching device

The present application is a divisional application of an invention patent application having an application number of 201310713076.4, an application date of 2013, 12 and 20, and an invention name of "machine tool with switch device".

Technical Field

The invention relates to a power tool, in particular a hand-held power tool, having a switching device for switching on and off a drive motor.

Background

DE 10345136 a1 describes an electric screwdriver which has an electric drive motor in a housing with two housing half-shells, which is switched on and off by means of a switching device. The switching device comprises a switching element which is mounted so as to be movable between two housing half-shells. An electrical contact is closed by the operation of the switching element, thereby operating the electric drive motor. The switch is loaded into its off position by the force of a spring element.

It is also known that: in the case of an electric tool, in addition to a main switch for switching on and off the electric drive motor, a locking switch is provided, which is held on the housing in a manner adjustable between a release position and a locking position, wherein in the locking position the main switch is locked in its on position. This has the advantage that, during operation of the power tool for a long period of time, the main switch does not have to be pressed manually into the on position for a long time. Such latching switches are held or guided either on a component of the main switch or on a cup-shaped housing part of the power tool.

Disclosure of Invention

The invention is based on the object of providing a power tool, which is equipped with a switching device for locking a main switch, in a simple construction and in a manner that is easy to assemble and easy to operate.

This object is achieved according to the features of the invention. Suitable modifications are described in the specification.

The power tool according to the invention is, in particular, a hand-held power tool having a drive motor, preferably an electric drive motor, and having a switching device by means of which the drive motor can be switched on and off. The switching device has a main switch, which is arranged on the housing of the power tool and can be adjusted between an on position and an off position and by means of which the drive motor is switched on and off. The switching device further comprises a locking switch which is held on the housing of the power tool in a manner adjustable between a release position and a locking position, wherein in the locking position the main switch is locked in its on position. In contrast, in the release position, the main switch can be returned into its switched-off position again, in particular under the action of a spring element acting on the main switch. Advantageously, a spring element acts also on the locking switch, which spring element acts with a force on the locking switch in the direction of the release position. The latching switch can have a cylindrical latching section, on which a spring element, which is embodied as a compression spring, can be positioned if necessary, as a result of which a compact embodiment is achieved.

The latching switch is a component which is designed separately from the main switch and which is not held on the main switch or on a component connected to the main switch in a manner adjustable between a latching position and a release position, but rather is arranged in a guide track of the housing in a manner adjustable. The housing consists of two housing halves between which the drive motor and, if appropriate, a transmission are received. The switching device with the main switch and the locking switch is also held between the housing half shells. The guide track in which the locking switch is guided is formed by two housing halves. The guide rails are in particular symmetrical with respect to a central bisector through the machine tool, relative to which the two housing halves are also arranged symmetrically. The guide rail can be open, in particular in the region of one or both end sides, so that dust which has intruded in does not block the guide rail, but is conveyed out of the guide rail again.

This positioning of the latching switch in the guide track between the two housing half-shells has the advantage that the assembly can be carried out easily and without problems. The housing half shells are produced, for example, as plastic cast components and are connected to one another by suitable connecting elements, in particular screws. During assembly, the switching device, including the locking switch, is first inserted into one housing half-shell and subsequently the second housing half-shell is connected to the first housing half-shell. In the assembled state, the latching switch can be assembled in the main assembly direction without requiring a pivoting of the housing. Furthermore, a space-saving embodiment can be realized.

The locking switch is mounted so as to be movable in a guide track formed by or delimited by the two housing half-shells. The reaction forces acting on the latching switch are thus received directly by the two housing half-shells via the guide rails.

According to a suitable embodiment, the locking switch secures the main switch in its locking position in a form-locking manner. This is achieved, for example, by: a projection on the locking switch projects into an associated recess on the main switch, wherein a recess is incorporated into the projection on the locking switch, against which recess a wall section of the main switch rests in the locking position. The projection is configured, for example, as a cylindrical component of the locking switch. A laterally projecting projection (wultst) can be arranged on the end flank of the projection, against which projection the axially directly front shell surface of the cylindrical component, for example a recess, is radially set back. If necessary, a recess is additionally added.

If the cylindrical projection projects into the recess in the main switch, the wall section of the main switch which delimits the recess engages behind the end face of the cylindrical section and comes into engagement with the recess in the wall face of the cylindrical section. The laterally projecting projections prevent an unintentional release of the locking. The form-locking is retained without external influence by the force of the spring element which loads the main switching force into the switched-off position. If the main switch is manually pressed slightly in the direction of the switched-on position, i.e. against the force of the spring element, the form-locking between the latching switch and the main switch can be released and the latching switch can be moved back into its released position. This preferably takes place under the action of a spring element acting on the locking switch.

The adjustment movement of the locking switch between the release position and the locking position is preferably implemented as a translatory movement. Accordingly, the guide tracks between the housing half-shells are constructed linearly. In principle, however, a rotary actuating movement or a mixed rotary translational actuating movement of the latching switch is also possible, wherein the guide track is correspondingly configured and, for example, has a curved course.

The adjusting movement of the main switch is preferably also a translatory displacement movement between the on position and the off position. If necessary, a rotary actuating movement or a mixed rotary/translational actuating movement is also considered for the main switch.

Suitably: the actuating movement of the main switch and the actuating movement of the latching switch run at an angle to one another. The tracks of the main switch and the locking switch intersect, wherein the locking switch blocks the movement of the main switch in the locking position.

According to a further advantageous embodiment, guide ribs are arranged on the two housing half shells, which guide ribs delimit the guide tracks. These guide ribs can form two parallel, opposite walls or wall sections of the guide rail, wherein each housing half shell with its guide ribs advantageously forms a wall flank of the guide rail. A plurality of ribs of a housing half shell are arranged in a row, which may have a spacing relative to one another. The guide ribs are expediently formed on the housing half-shells, which are produced in a plastic casting process.

The spring element, which acts to urge the locking switch into its release position, is supported on a housing component according to other suitable embodiments. The support is preferably carried out only on one housing half shell, which facilitates the assembly of the latching switch with the spring element loading it.

The locking switch can be actuated in particular manually and can be adjusted between its locked state and its released state. For this purpose, the locking switch has an actuating section which can be formed in one piece with the locking switch and projects outward through a recess in the housing half shell, so that the locking switch can be actuated from the outside by a user.

The power tool can optionally be equipped with a battery for the current supply of the drive motor.

Drawings

Further advantages and suitable embodiments are derived from the description, the drawing description and the drawing. Wherein:

fig. 1 shows a hand-held power tool embodied as an electric screwdriver or electric drill, with a housing half-shell and a switching device for switching on and off a drive motor;

fig. 2 shows the hand-held power tool in a view from the front;

fig. 3 shows a guide track in a housing half-shell for a locking switch;

FIG. 4 shows a view similar to FIG. 3 but with a locking switch in the guide track;

fig. 5 shows the locking switch in the guide track, which is formed by two housing halves.

In these figures, like components are provided with like reference numerals.

Detailed Description

Fig. 1 and 2 each show a hand-held power tool 1, which is embodied as an electric screwdriver or an electric drill and has a housing 2, which is composed of two

housing halves

2a, 2 b. The two

housing halves

2a, 2b are substantially mirror-symmetrically configured relative to one another. An electric drive motor is received in the housing 2, the drive movement of which can be transmitted via a transmission to a tool, which is received in a receiving device 3 (head holder). In the lower part of the housing, there is a receiving space for receiving a battery pack, by means of which the electric drive motor can be supplied with current.

The hand-held power tool 1 has a switching device 4, by means of which the drive motor is switched on and off. The switching device 4 comprises a main switch 5, which is arranged on the outer side of the housing 2 and is axially displaceable between an on position and an off position, wherein in the on position of the main switch 5 an electrical contact is made for closing an electrical circuit of the electric drive motor. The actuating movement of the main switch 5 takes place in a translatory manner, the axis of the actuating movement running approximately parallel to the motor axis of the drive motor or parallel to the tool axis of the tool to be received.

The switching device 4 furthermore comprises a locking switch 6, which is arranged in the housing 2 below the main switch 5. The locking switch 6 has an actuating section 7 which projects outward through a recess in the housing and can be actuated by a user. The main switch 5 can be locked in its on position by the translatory locking switch 6 which is held adjustably in the housing 2. For this purpose, the locking switch 6 has a cylindrical locking section 8 which can be brought into engagement with a recess 9 on the underside of the main switch 5. The actuating direction of the latching switch 6 runs transversely to the actuating direction of the main switch 5, and the two

switches

5, 6 are acted upon by the force of a spring element in the direction of their initial position, i.e. the main switch 5 is moved into its switched-off position and the latching switch 6 is moved into its released position. The spring element 14 acting on the locking switch 6 is designed as a compression spring and is fitted onto the cylindrical locking section 8.

The locking switch 6 is mounted so as to be movable in a guide track 10 (fig. 3) which is formed in the housing half-

shells

2a, 2b and is delimited by

guide ribs

11a, 11b (fig. 3, 4, 5). The

guide ribs

11a, 11b are formed on the respective housing half-

shells

2a, 2b and together form the guide rail 10 in such a way that the

guide ribs

11a and 11b form opposite wall sections of the guide rail 10. Between the

guide ribs

11a and 11b following one another in the axial direction, there is a gap.

A further guide element 12, which is formed integrally with one of the housing half shells, for example with the housing half shell 2b, is located in front of the guide rib 11 and serves to receive the cylindrical locking section 8. The guide element 12 can simultaneously serve to support the spring element, which loads the locking switch 6 into its release position. It is sufficient that only one guide element 12 is provided in the housing 2 for supporting the cylinder-shaped locking section 8 and for supporting the spring element.

As shown in fig. 4, a radially projecting projection 13 is provided on the end face of the cylindrical locking section 8, which projection extends at least on one side of the section 8. The projection 13 serves for form-locking protection if the tip of the cylindrical locking section 8 projects into the recess 9 on the underside of the main switch 5. A relative depression or a return is thereby formed on the lateral surface of the cylindrical locking section 8 directly in front of the projection 13, against which the wall of the main switch 5 that engages the recess 9 rests in the locked position. The main switch 5 is loaded by spring force to press the wall against the recess or rebound on the side surface of the cylindrical locking section 8, wherein the projecting protrusion 13 prevents: the latching switch 6 is again deflected into its release position by the force of a spring element acting thereon.

The locking position can be cancelled by the main switch 5 being pressed slightly in the direction of the on position, so that the cylinder-shaped locking section 8 can be released out of the recess 9 in the main switch 5 and moved back into the released position. The main switch 5 can then also be returned from the on position into the off position.

Claims

1. Machine tool having a switching device (4) for switching on and off a drive motor, wherein the switching device (4) has a main switch (5) held adjustably on a housing (2) between an on position and an off position, and a latching switch (6) held adjustably on the housing (2) between an off position and a latching position, and which latches the main switch (5) in the on position in the latching position, characterized in that the housing (2) has two housing halves (2a, 2b), between which the switching device with the main switch and the latching switch is held, which together form a guide track (10) for a connection between the two housing halves (2a, 2b), 2b) The guide rail is openly configured such that dust can be conveyed out of the guide rail (6).

2. Machine tool according to claim 1, wherein the latching switch (6) secures the main switch (5) in the latched position in a form-locking manner.

3. Machine tool according to claim 2, characterized in that in the locking position a projection (8) on the locking switch (6) projects into an associated recess (9) on the main switch (5), wherein a recess is introduced into the projection (8) for the purpose of establishing the form-locking.

4. Machine tool according to one of claims 1 to 3, characterized in that the main switch (5) is translationally adjustable between the on position and the off position.

5. Machine tool according to one of claims 1 to 4, characterized in that the latching switch (6) is translationally adjustable between the release position and the latching position, wherein the adjustment direction of the latching switch (6) runs at an angle to the adjustment direction of the main switch (5).

6. Machine tool according to one of claims 1 to 5, characterized in that the latching switch (6) is loaded into the release position by a spring element (14) force.

7. Machine tool according to claim 6, characterised in that the spring element (14) is supported on only one housing half shell (2a, 2 b).

8. Machine tool according to one of claims 1 to 7, characterised in that the guide tracks (10) on the housing half-shells (2a, 2b) are delimited by guide ribs (11) which are formed on the two housing half-shells (2a, 2 b).

9. Machine tool according to claim 8, characterised in that the guide ribs (11) of the housing half shells (2a, 2b) are arranged offset relative to one another and engage one another in the assembled state.

10. The machine tool according to one of claims 1 to 9, wherein the locking switch (6) has an actuating section (7) for manual adjustment, which projects outward through a cutout in the housing half-shells (2a, 2 b).

11. Machine tool according to claim 1, wherein the machine tool is a hand-held machine tool (1).