Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
  • B25D16/006—Mode changers; Mechanisms connected thereto
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
  • B25D2216/0007—Details of percussion or rotation modes
  • B25D2216/0023—Tools having a percussion-and-rotation mode
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
  • B25D2216/0007—Details of percussion or rotation modes
  • B25D2216/0038—Tools having a rotation-only mode
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
  • B25D2216/0007—Details of percussion or rotation modes
  • B25D2216/0046—Preventing rotation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
  • B25D2216/0069—Locking means

Definitions

• the present invention relates to an electric hand tool at least comprising the elements, features and components defined in the preamble of the appended single main claim number 1.
• Such movable operating elements are substantially known in general, for instance from DE-10.2004.055.236.
• a blocking embodied as a slide which acts on a toothed wheel of the transmission on the drive shaft and which can be driven with a cam on an outer side of a rotating disc.
• a user has to move the slide to a blocking position counter to a spring force with the rotary knob.
• the blocking is released and the motor can set the tool holder into motion.
• the present invention has for its object to provide a solution for, or to at least (considerably) reduce, the above-mentioned and/or other problems and drawbacks of the known art, for which purpose the elements, features and components are additionally provided as defined in the characterizing part of the appended single main claim number 1.
• curve tracks as opposed to for instance cams
• many functions and functionalities can be actuated, selected, controlled or set using a single operating element, for instance a rotary knob or possibly even a slide element.
• followers can then be oriented on a single curve track or on different curve tracks, whereby a plurality of followers can co-act with one or more than one curve track and can each be associated with a different function or functionality.
• the configuration with a locking plate with a locking catch or cam which engages round the drive shaft moreover provides the option of realizing a self-actuating locking or blocking.
• a curve oriented and running toward the drive shaft can be pressed away from the drive shaft.
• a single spring element can be used here to urge the locking plate with the blocking catch toward the drive shaft, wherein the blocking catch acts on the drive shaft only when the curve yields and the spring is able to urge the locking plate with the blocking catch toward the drive shaft.
• the hand tool has a blocking catch acting on a drive shaft and the blocking catch lies opposite the operating element relative to the drive shaft.
• the follower is preferably directed toward the operating element here, and a compact and elegantly simple configuration is also found to result here, in which the blocking extends round the drive shaft between the follower and the blocking catch.
• the hand tool can have the feature of having at least two curve tracks and at least two followers. With more than one follower for one of the curve tracks the number of followers can even be greater than the number of curve tracks. At least as many functionalities and functions can thus be set, selected or controlled by a user as the number of curve tracks on the inner side of the operating element.
• the hand tool can have the alternative or additional feature that the curve track comprises a guide surface for guiding the follower which varies in height relative to the side of the operating element facing toward the interior of the housing.
• the curve track or tracks can also comprise a milled track which can be followed by a follower.
• the variations in (depth or) height along the curve track correspond to adjustments in functions or functionalities which can be selected, controlled and/or set using the operating element.
• lateral variations relative to a longitudinal direction of a curve track can be defining for this purpose.
• the hand tool can have the alternative or additional feature that the operating element is a rotary knob.
• a rotary knob is per se known, although not in the sense that a rotary knob comprises at least one curve track, and this embodiment results in an extremely compact
• the curve track may be concentric relative to a rotation axis of the rotary knob. Diverse other curve tracks can then extend at other diametric distances from the rotation axis of the knob, this also contributing toward a compact and elegantly designed combination of many functions and
• the blocking may otherwise also be very advantageous for the blocking to co-act with a resilient element in order to be urged under spring force to a blocking position and to be selectively moved via the follower into or out of the blocking position with the curve track.
• the blocking "searches for" the blocking position under the influence of the resilient element as long as or as soon as the position of the follower relative to or along the curve track requires the thus blocking position (as soon as or when the user sets such a position of the operating element or opts to activate the blocking) .
• the hand tool can have the alternative or additional feature that the follower is at least connected to or co-acts with a main switch for selectively enabling or disabling a connection of the hand tool to an electrical power supply.
• the follower is at least connected to or co-acts with a main switch for selectively enabling or disabling a connection of the hand tool to an electrical power supply.
• a manual switch can still always be provided here for a user to selectively switch the motor on and off in an enabled mode of the main switch. The user can then use a knob on for instance a handle of the hand tool in a usual manner to set the hand tool into operation.
• This manual switch can then also effect a setting of intensity or rotation speed or motor power or, in yet another design, this setting or control can also be realized in the operating element, wherein the manual switch is limited to an on/off function.
• a blocking and a main switch it may be advantageous for the curve track or tracks for the blocking and for the main switch to be embodied such that the power supply is simultaneously disabled via the main switch in a blocking position of the blocking.
• the purpose hereof has already been elucidated above.
• the hand tool can have the alternative or additional feature that the follower is at least connected to or co-acts with a hammer selector for selectively activating and deactivating a vibration or hammer mechanism.
• the hammer selector for the vibration or hammer mechanism can operate by not switching on this mechanism or by not mechanically connecting this mechanism to the drive or transmission or to the motor.
• the hand tool can have the alternative or additional feature that the follower is at least connected to or co-acts with a screwing or drilling selector for selectively activating and deactivating a screwing or drilling mechanism.
• the screwing or drilling mechanism can be a single mechanism, the rotation speed and/or an applied motor power of which define ( s ) a desired application .
• Fig. 1 is a perspective view of (a part of) a drill as embodiment of an electric hand tool according to the present invention
• Fig. 2 is a perspective view of a part of a rotary knob facing inward into the drill as embodiment of an operating element according to the present invention
• Fig. 3 is a perspective view of a part of the internal mechanism of a drill such as that in Fig. 1 with a removed rotary knob;
• Fig. 4 is a view in even further detail relative to Fig. 3 in which a holder for the rotary knob has been removed;
• Fig. 5 is a perspective cross-sectional view of the drill of Fig. 1;
• Fig. 6 is a perspective view of particularly a blocking according to the present invention.
• Fig. 7 is a perspective view of particularly a vibration or hammer mechanism.
• Fig. 8 is a perspective view of particularly a detail of a main switch.
• Drill 1 shows a drill as possible embodiment of an electric hand tool according to present invention.
• Drill 1 comprises a housing 2 and a drill chuck 3 as possible embodiment of a tool holder, since a drill can after all be placed and locked therein as embodiment of a tool .
• housing 2 forms a housing for a motor and a transmission which transmits power from the motor to drill chuck 3.
• the motor and transmission are not shown in fig. 1.
• What fig. 1 does show is a rotary knob 4 as embodiment of an operating element according to the present invention.
• Fig. 2 shows a view of rotary knob 4 on the side thereof facing toward the interior of housing 2 in the mounted position of rotary knob 4 as shown in fig. 1.
• Fig. 2 shows that curve tracks 5, 6 and 7 are arranged on the side of rotary knob 4 shown therein.
• Curve tracks 5 and 6 lie at the same diameter relative to the centre of rotary knob 4, where a hole is arranged to enable fixed mounting of rotary knob 4 on housing 2.
• the third curve track 7 extends at a smaller diameter relative to continuous hole 8.
• Three curve tracks 5, 6 and 7 are therefore provided in this way on the inward facing side of rotary knob 4. Each of these curve tracks can be used to actuate, control, select or set a specific function or functionality.
• follower elements lie against curve tracks 5, 6 and 7.
• These follower elements can take the form of the cams 9, 10 and 11 shown in fig. 3, which come to lie against the respective curve tracks 5, 6 and 7 when rotary knob 4 of fig. 2 is mounted against and in a cylindrical holder 12 on housing 2 (which is largely broken away in fig. 3) .
• Cam 9 co-acts here with curve track 5, cam 10 co-acts with curve track 6, and cam 11 co-acts with curve track 7 at a distance from a screw 13, with which knob 4 can be mounted in hole 8 on housing 2, which is shorter than that of cams 9 and 10.
• Fig. 2 shows that (at least) curve track 6 comprises a dip 23 as embodiment of a relatively shallow recess. This serves to provide an auditive or tactile indication of having reached a position corresponding to a functionality during turning of the rotary knob.
• a follower element for instance cam 10, is received here in dip 23 but does not impede further turning of rotary knob 4.
• the user will notice from a clicking sound or from a tapping sensation on his or her hand that the knob is being rotated beyond a position associated with one of the possible functionalities.
• Each of the curve tracks or a selection thereof can comprise one or more than one dip in order to thus provide an indication each time a position associated with a desired functionality or combination of functionalities is reached.
• Visual indicators are preferably also arranged on housing 2, this not being shown, such as pictograms, for the purpose of visually indicating the associated functionalities to the user.
• FIGs 4, 5 and 6 show a locking plate 14.
• An outer end of locking plate 14 forms the cam 10.
• locking plate 14 comprises a central passage through which protrudes a shaft 15 around which a release sleeve 16 is arranged.
• Locking plate 14 is pressed by means of a spring 17 in the direction of shaft 15 and of rotary knob 4, wherein spring 17 acts on the part of locking plate 14 lying opposite cam 10 relative to shaft 15 or the passage.
• a blocking catch embodied as protrusion 18 comes to lie here against locking plate 14 in a recess 19 in shaft 15 in order to lock shaft 15.
• Curve track 7 acts on a slide plate 21 which is also pressed toward rotary knob 4 under the influence of the spring force of a spring 22. With a rotation of rotary knob 4 and a desired form of curve track 7, this curve track 7 can press cam 11 aside in order to thus set a hammer and/or vibration mechanism into operation.
• a user In an unlocked state of shaft 15 and with power to be supplied to the motor (main switch 20 is switched on) a user can thus opt for a drilling and/or screwing position or a hammer and vibrating position.
• the hammer and/or vibration mechanism (not shown) can, with its own drive, be set into operation or be mechanically connected to and uncoupled from the transmission between the motor (not shown) of drill 1 and shaft 15 and drill chuck 3.
• Most usual in the field of drills is for a mechanical and selectively switchable coupling to be applied between the hammer and/or vibration mechanism and shaft 15.
• Locking plate 14 need thus only be displaced over a distance which is a little greater than the dimensions of cam 18 in order to unlock shaft 15, this distance being determined by an appropriate variation in height of the associated curve track 6. Conversely, the adjustment of another setting can require a displacement over a longer or shorter distance, for which purpose an associated individual curve track must have a matching height variation, which may differ from the variation in height of curve track 6.
• the transmission can thus be formed wholly by the drive shaft, which need not even comprise more than a motor shaft of the motor, wherein the tool holder can be arranged on the drive shaft and no further elements or components need be provided other than the motor and the shaft thereof, and the tool holder.
• the blocking can act here directly on the motor shaft.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Drilling And Boring (AREA)
• Portable Power Tools In General (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=45811602

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (5)

• 2011
  • 2011-03-01 NL NL2006319A patent/NL2006319C2/nl not_active IP Right Cessation
• 2012
  • 2012-02-24 EP EP12707947.3A patent/EP2681012A1/en not_active Withdrawn
  • 2012-02-24 WO PCT/NL2012/050109 patent/WO2012118370A1/en active Application Filing
  • 2012-02-24 RU RU2013143949/02A patent/RU2013143949A/ru not_active Application Discontinuation

Non-Patent Citations (1)

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