EP0923096B1 - Elektrowerkzeug, insbesondere eine Oberfräse - Google Patents
Elektrowerkzeug, insbesondere eine Oberfräse Download PDFInfo
- Publication number
- EP0923096B1 EP0923096B1 EP98123657A EP98123657A EP0923096B1 EP 0923096 B1 EP0923096 B1 EP 0923096B1 EP 98123657 A EP98123657 A EP 98123657A EP 98123657 A EP98123657 A EP 98123657A EP 0923096 B1 EP0923096 B1 EP 0923096B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- trigger element
- locking element
- power tool
- electric power
- trigger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/20—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
Definitions
- the invention relates to an electric power tool comprising a housing in which is housed an electric motor and an on/off switch for the motor, a trigger element which is displaceable out of an off-position, in which an actuation surface of the trigger element projects from the housing, and into an on-position in which the on/off switch is activated, and a locking element which is mounted at the trigger element, which is displaceable and which in a non-displaced position prevents movement of the trigger element into the on-position and in its displaced position allows movement of the trigger element into its on-position.
- an elongated trigger element is present which at its one end is mounted pivotable in the housing of the angle grinder and at the other end of which a locking element is mounted which can be displaced against the force of a compression spring in the direction of the longitudinal extension of the trigger element.
- the locking element In its rest position, the locking element lies with a projecting surface opposite a hook-shaped stop element in the tool housing, so that, when an attempt is made to displace the trigger element in the direction of the on-position, the stop surface of the locking element comes to rest, against the stop element blocking the displacement movement.
- the stop element can dip, upon a pivot movement of the trigger element in the direction of its on-position, into a recess in the locking element, so that the displacement movement of the trigger element is no longer blocked, but the latter can reach the on-position.
- the trigger element for the on/off switch is integrated into one of the side-handles of the router, and a locking element which is articulated to the trigger element, projects with a gripping portion over the outer periphery of that part-portion of the trigger element which lies outside the handle housing when the trigger element is in the off-position. It is therefore also possible with this arrangement through an unfortunate concatenation of loading of locking element and trigger element, to firstly pivot the locking element out of its position blocking the trigger element against displacement into the on-position, with the result that the trigger element is possibly then unintentionally pivoted into the on-position, as a result of which, if the router is connected to the power supply, its electric motor starts up, i.e. the unsupervised operating state already mentioned above comes about.
- US 4879438 on which the preamble of claim 1 is based, discloses a lock-on/lock-off switch for a power tool wherein a trigger projecting from an actuating lever must be depressed before the actuating lever can be depressed to operate the power tool.
- the object of the invention is to improve an electric power tool in such a way that the danger of an unexpected displacement of the trigger element into its on-position, say as a result of the electric power tool being dropped, is at least considerably reduced.
- an electric power tool according to claim 1.
- the locking element does not project beyond the actuation surface of the trigger element, it cannot be accidentally touched or displaced, say if the electric power tool is dropped, from its undisplaced position against an acting spring force, as a result of which it would be possible to move the trigger element into its on-position. Rather, the user must grasp, or exert pressure on, the actuation surface of the locking element which is recessed relative to the actuation surface of the trigger element, in order to bring about the displacement of the locking element, and only then can the trigger element be manually moved into its on-position.
- the locking element is mounted on the trigger element.
- the actuation surface of the locking element is located for this purpose in a recess provided in the actuation surface of the trigger element. The user must therefore exert pressure on the locking element through this recess in order to move it out of its undisplaced position. An accidental displacement of the locking element, in particular if the electric tool is dropped, is thereby practically impossible.
- the trigger element is preferably mounted pivotable about an axis, and in the case of such a structure the locking element may be mounted, preferably pivotably mounted, in the trigger element towards the end of the remote from the axis.
- the povitably mounted locking element is L-shaped
- its first arm may form the actuation surface on which the user must exert pressure in order to displace the locking element against a spring force
- its second arm may lie opposite a lock surface provided in the housing when the locking element is in the non-displaced position, with the result that, when an attempt is made to shift the trigger element without prior pivoting of the locking element, the second arm engages with the lock surface, and prevents the movement of the trigger element into its on-position.
- an L-shaped locking element When an L-shaped locking element is used, it is possible in an easy way to also provide a locked on-position for the trigger element by forming, on the second arm of the L-shaped locking element, a hooked portion which, when the trigger element is in the on-position, can be made to engage with an engagement portion of a lock part in order to keep the trigger element in the on-position.
- the lock part can be manually displaced against spring force to engage the hooked portion. If, as is customary with such arrangements, the lock part holding the locking element is then manually displaced further against the action spring force, it ceases to engage with the hooked portion of the locking element, which is thereby pivoted back into its starting position as a result of an acting spring force. Upon release, the trigger element now returns to its off-position, while the lock part is likewise returned to its starting position after release as a result of an acting spring force.
- the router represented in Figure 1 has a motor housing 1 which is arranged in the customary way displaceable against spring force on guide columns 2, 3 which are secured to a shoe or baseplate 4.
- the baseplate 4 has a central opening which lies underneath the tool holder 6, which is formed at the lower end of the armature of the electric motor located in the motor housing 1 and in which a router bit can be held in clamping manner.
- the router bit is guided through the central opening 5 in the baseplate 4 and made to engage with the workpiece to be machined.
- the depth of penetration of the router bit can be limited to the desired depth in the usual way by mans of a stop pin 7 mounted in clamping manner on the motor housing 1 and stops provided at a stop support 8 rotatably attached to the baseplate 4.
- Handles 10, 11 are arranged at the side of the motor housing 1, and an on/off switch 22 is located in the handle 10, via which the electric motor located in the motor housing 1 is activated, which can be connected to a power source via a cable, not shown, which is guided into the motor housing 1 through a guard 9.
- the handle 10 just like handle 11, is formed from two half-shells 12, 13, half-shell 12 having an upper projection 16 and a lower projection 14 which are fixedly connected to the motor housing 1 by means of screws extending in these areas through both half-shells 12, 13.
- the two half-shells form an inner space in which the on-off switch 22 for the router is arranged in the customary manner by means of ribs provided in the half-shells.
- This switch has a switch-actuating pin 23, with a supporting flange 23' formed at the outer end, between which and a stationary part of the switch housing a compression spring 24 is arranged. If the switch-actuating pin 23 is shifted against the force of the spring 24 in the direction of the switch housing and into the latter, the on/off switch assumes its on-position and the electric motor of the router is activated if the latter is connected to a power source.
- the trigger element 20 is essentially designed in the form of a box. It is open at the inner side facing the on/off switch 22, and has there a cross-rib coming to rest against the supporting flange 23'. It is held pivotable about an axis 21 formed underneath the opening in the handle 10.
- the axis 21 may be designed as a pin in one piece with a half-shell of the handle 10.
- An opening 20' is formed in the outwardly directed wall of the trigger element 20 at the end remote from the pivot axis 21, and in this area a locking element 25 is pivotably mounted in the trigger element 20.
- the locking element 25 is essentially L-shaped and lies with its one arm 28 in the area of the opening 20' of the trigger element 20 and there forms with its outer surface 29 an actuation surface 29 for the user.
- the other arm 30 extends roughly at right angles to the one arm 28 and forms a hooked section 31 at its outer upper end.
- the locking element 25 is biased by a compression spring 27 in the direction of an anti-clockwise rotation ( Figures 3 to 5).
- the compression spring 27 encloses a housing-fixed pin 19 and rests with its end remote from the locking element 25 against a part of the half-shell 12.
- the locking element 25 In the unloaded state, the locking element 25 is kept by the force of the spring 27 in the position according to Figure 3, in which it rests with its arm 30 against a stepped section 17 of the half-shell 12 and is thus impeded from a further anti-clockwise rotation.
- the actuation surface 29 of the arm 28 of the locking element 25 is situated underneath or recessed relative to the actuation surface of the trigger element 20 that is not covered by the half-shells 10, 11.
- the surface forming the actuation surface 29 lies completely within the inside space of the box-shaped trigger element 20. Therefore, in order to displace the locking element 25 against the force of the spring 27, the user must reach into the opening 20' formed in the trigger element 20. Therefore, an accidental displacement, even say through the striking of an edge or corner if the router is dropped, is clearly reduced.
- the locking element 25 is in the position according to Figure 3, then, as already mentioned, its arm 30 engages with a stepped portion 17 of the half-shell 12, and a displacement of the trigger element 20 about the axis 21 is prevented by resting of the arm 30 against the lock surface formed by the stepped portion 17. Only when the user has consciously, by acting on the actuation surface 29 of the locking element 25, caused the latter to pivot about the axis 26 into the position according to figure 4, can he also pivot the trigger element 20 about the axis 21 and bring the on/off switch 22 into the on-position, with the result that the motor of the router is activated.
- a lock part 32 Projecting from the upper end of the handle 10 is the actuation head of a lock part 32 which is biased by the force of a spring 34 in the direction of an outwardly displaced position according to Figures 3 and 4.
- the lock part 32 has a hook-shaped engagement portion 33 which, by shifting of the lock part 32 against the force of the spring 34, moves inwards into the region of the hooked portion 31 of the locking element 25 which has been pivoted out of its blocked position. In this way the positive engagement shown in Figure 5 between locking element 25 and lock part 32 is produced, and through this the trigger element 20 which has been displaced into the on-position is held in this on-position and thus the on/off switch 22 is also held in the on-position.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling, Drilling, And Turning Of Wood (AREA)
Claims (9)
- Elektrowerkzeug, aufweisend:ein Gehäuse, in dem ein Elektromotor und ein Ein/Aus-Schalter (22) für den Motor untergebracht ist,ein Betätigungselement (20), das aus einer Aus-Stellung, in der es mit einer Betätigungsfläche aus dem Gehäuse vorsteht, und in eine Ein-Stellung verlagerbar ist, in der der Ein/Aus-Schalter (22) aktiviert ist, undein verlagerbares Verriegelungselement (25), das derart benachbart zum Betätigungselement (20) angeordnet ist, dass es in einer unverlagerten Stellung die Bewegung des Betätigungselements in die Ein-Stellung verhindert und in einer verlagerten Stellung die Bewegung des Betätigungselements in seine Ein-Stellung gestattet,
- Elektrowerkzeug nach Anspruch 1, dadurch gekennzeichnet, dass das Verriegelungselement (25) am Betätigungselement (20) angebracht ist.
- Elektrowerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Betätigungsfläche (29) des Verriegelungselements (25) sich in einer in der Betätigungsfläche des Betätigungselements (20) vorgesehenen Aussparung (20') befindet.
- Elektrowerkzeug nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Betätigungselement (20) um eine Achse (21) verschwenkbar gehaltert ist.
- Elektrowerkzeug nach Anspruch 4, dadurch gekennzeichnet, dass das Verriegelungselement (25) in Richtung auf das von der Achse (21) entfernte Ende des Betätigungselements (20) an diesem befestigt ist.
- Elektrowerkzeug nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verriegelungselement (25) schwenkbar am Betätigungselement (20) angebracht ist.
- Elektrowerkzeug nach Anspruch 6, dadurch gekennzeichnet, dass das Verriegelungselement (25) L-förmig ist und einen ersten Arm (28), der die Betätigungsfläche (29) aufweist, und einen zweiten Arm (30) hat, der sich gegenüber einer gehäusefesten Riegelfläche (18) befindet, wenn das Verriegelungselement (25) in der unverlagerten Stellung ist.
- Elektrowerkzeug nach Anspruch 7, dadurch gekennzeichnet, dass der zweite Arm (30) einen Hakenbereich (31) hat, der in der Ein-Stellung des Betätigungselements mit einem Eingriffsbereich (33) eines Riegelteils (32) in Eingriff bringbar ist, um das Betätigungselement in der Ein-Stellung zu halten.
- Elektrowerkzeug nach Anspruch 8, dadurch gekennzeichnet, dass das Riegelteil (32) für den Eingriff mit dem Hakenbereich (31) verschiebbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19756290 | 1997-12-11 | ||
DE19756290A DE19756290A1 (de) | 1997-12-11 | 1997-12-11 | Elektrowerkzeug mit einem Ein/Aus-Schalter |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0923096A2 EP0923096A2 (de) | 1999-06-16 |
EP0923096A3 EP0923096A3 (de) | 2000-05-10 |
EP0923096B1 true EP0923096B1 (de) | 2004-09-15 |
Family
ID=7852367
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98123657A Expired - Lifetime EP0923096B1 (de) | 1997-12-11 | 1998-12-11 | Elektrowerkzeug, insbesondere eine Oberfräse |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0923096B1 (de) |
DE (2) | DE19756290A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19915559C2 (de) * | 1999-04-07 | 2001-06-28 | Itw Befestigungssysteme | Wandschlitzfräse |
SE522871C2 (sv) * | 2001-11-28 | 2004-03-16 | Electrolux Abp | Elektrisk arbetsmaskin |
US20040035495A1 (en) * | 2002-08-21 | 2004-02-26 | Hessenberger Jeffrey C. | Router |
DE102006061242A1 (de) * | 2006-12-22 | 2008-06-26 | Robert Bosch Gmbh | Oberfräse |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781579A (en) * | 1973-01-03 | 1973-12-25 | Black & Decker Mfg Co | Protected lock means for electrically-operated,hand-manipulated tools |
US4006334A (en) * | 1975-03-17 | 1977-02-01 | Mcgraw-Edison Company | Safety switch for power tool |
JPS6114403Y2 (de) * | 1980-03-26 | 1986-05-06 | ||
DE8604618U1 (de) * | 1986-02-21 | 1986-04-17 | Metabowerke GmbH & Co, 7440 Nürtingen | Elektromotorisch angetriebene Handkreissäge |
US4879438A (en) * | 1988-08-01 | 1989-11-07 | Ryobi Motor Products Corp. | Lock-on/lock-off switch for power tool |
DE9320029U1 (de) * | 1993-01-30 | 1994-06-01 | Robert Bosch Gmbh, 70469 Stuttgart | Elektrohandwerkzeug mit Schaltsperre |
US5428197A (en) * | 1993-06-01 | 1995-06-27 | Ryobi Motor Products Corp. | Electric tool actuator switch |
DE4407418C2 (de) * | 1994-03-03 | 1998-02-19 | Black & Decker Inc | Schalteranordnung, insbesondere für eine Oberfräse |
DE4439590C2 (de) * | 1994-11-05 | 1997-04-24 | Bosch Gmbh Robert | Handwerkzeugmaschine |
-
1997
- 1997-12-11 DE DE19756290A patent/DE19756290A1/de not_active Ceased
-
1998
- 1998-12-11 DE DE69826222T patent/DE69826222T2/de not_active Expired - Lifetime
- 1998-12-11 EP EP98123657A patent/EP0923096B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69826222T2 (de) | 2005-11-17 |
DE69826222D1 (de) | 2004-10-21 |
EP0923096A2 (de) | 1999-06-16 |
EP0923096A3 (de) | 2000-05-10 |
DE19756290A1 (de) | 1999-06-17 |
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