CN1205665A

CN1205665A - Hand-held electric tool

Info

Publication number: CN1205665A
Application number: CN96199107A
Authority: CN
Inventors: S·乌恩施; P·斯蒂尔勒; R·福赫斯; J·米勒尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1995-12-19
Filing date: 1996-10-26
Publication date: 1999-01-20
Anticipated expiration: 2016-10-26
Also published as: DE19547331A1; EP0868264B1; CN1070406C; WO1997022444A1; EP0868264A1; DE59608572D1; JP2000501030A

Abstract

The invention relates to an electric hand-held power tool (10,100) having a housing (11,111) in which a motor (16) and a drive shaft (50) are arranged, and having an eccentric journal (51,52) which moves in a circular manner, and having a tool (88,188,288) which is connected to the eccentric journal (51,52) and which can be moved back and forth and has a clamping end (77) which is held in the housing (11,111) and has a recess (90,91,93), wherein a movement-transmitting catch (68,69) is arranged between the tool (88,188) and the eccentric journal (51,52), the catch (68,69) having a bore (72, 72') in which the eccentric journal (52) is rotatably inserted. The production is simplified and the costs are reduced by the catch (68,69) being detachably inserted by means of a projection (70,71), in particular a journal, into a recess (90,91,93) of the clamping end (77) of the insertion tool (88,188,288,388,488, 588).

Description

Hand-held electric tool

The invention relates to a hand-held electric power tool according to the preamble of claim 1.

Document DE-OS 4235278 discloses a hand-held power tool of this type, whose file-shaped insertion tool is driven back and forth by an eccentric shaft via a catch. The rod-shaped clamping means, which can be moved from the outside by the actuating element into the clamping and release positions, but which also have to follow the movements of the catch and of the insertion tool, are detachably inserted into mutually aligned openings of the insertion tool and of the catch. The production of the clamping mechanism for coupling the insertion tool to the catch is therefore relatively expensive.

The hand-held power tool according to the invention with the features of claim 1 has the advantage that the clamping mechanism consists of only a few inexpensive individual parts, with which it is possible to connect the catch in an easy manner with a few simple handles, so that it is also possible to remove or replace it quickly.

The risk of the operator being cut by the blade of the insertion tool is reduced by the simplicity of operation. Simple tool replacement is also advantageous in this way to improve the safety of the work.

The catch itself is detachably inserted by means of a projection into a recess in the clamping end of the insertion tool, whereby a particularly simple-structured, easy-to-handle clamping system for a scraping tool or the like of a structure of the insertion tool is provided.

Further advantages of the invention are obtained by the features set forth in the dependent claims, for example by the catch being resiliently supported axially displaceable relative to the eccentric journal, the catch being manually displaceable from the outside of the housing into the release position by simple pressure button operation. The plug-in tool can thus be separated from the drive by simple components, so that it can be easily removed or replaced.

The catch can be disengaged from the insertion tool by displacement, whereby the insertion tool is separated from the drive mechanism and can be easily removed, so that operation can be carried out with simple components, namely a pressure button, by means of which the catch can be displaced manually. This feature is particularly simple and comfortable because the pressure button is supported on a catch which can be moved in the same direction as the catch into the release position. In addition, the pressure button has hooks, by means of which it is prevented from falling off in the direction opposite to the operating direction inside the housing, and radial ribs, by means of which it is supported axially on the plunger, so that it can be made very easily as a thin hollow body with a plurality of spring elements joined together.

The pressure button is held in a release position of the insertion tool by the latching means in relation to the housing and can be released again when the latching means is inserted by the tool, so that the pressure button does not have to be held in the depressed state during insertion of the tool. The operator can thus grasp the hand-held power tool with one hand and use the other hand for removing the tool. This significantly facilitates the replacement of the insertable tool. The release function of the press button can also be easily achieved by providing it with snap-hook-like retention elements which snap against an edge of the interior of the housing when the press button reaches the release position.

By providing spring members between the pawl and the housing that are substantially aligned with the drive shaft, these spring members bear on the pawl and the pressure button, thereby reliably returning the pressure button to its starting position when the pressure button is released or when the tool is clamped. By supporting the spring element relative to the housing and the pawl via the annular washer, wear between the spring and the part transmitting the movement is reduced.

The catch is fitted with a rolling bearing, in particular a needle bearing, in its recess for the passage of the eccentric journal, so that friction and wear during the transmission of forces between the drive mechanism and the insertion tool are greatly reduced.

By making the catch as a disc, with the holes and protrusions arranged in alignment with each other, the catch is very simple and inexpensive to construct. A catch of this design is advantageous when the recess of the clamping end of the insertion tool is a slot extending transversely to the direction of movement, which slot has substantially the same diameter in the direction of movement as the projection of the catch. A further advantageous configuration of the catch is obtained if the recess of the clamping end of the insertion tool also has a larger diameter in the direction of movement than the projection inserted therein.

By making the catch of the link type and having a head provided with a projection, which is guided in a vibration-damped manner in a groove of the longitudinal guide, an undesired rotation of the catch inside the housing is avoided and a very quiet, low-wear operation of the hand tool is achieved. The axially parallel arrangement of the projections to the eccentric journal and the radial spacing from the recesses then limit the rotatability of the catch relative to the eccentric journal, so that friction and wear between the eccentric journal, the catch and the insertion tool are avoided. It is then advantageous when the recess of the clamping end of the insertion tool is circular and has substantially the same diameter as the projection of the catch.

Instead of a circular recess, it can also be an elongated bore-shaped clamping end recess extending in the longitudinal direction in the direction of movement of the insertion tool, the length of which is greater than the stroke of the eccentric. In this way, the movement is transmitted from the drive to the workpiece via the catch only when the insertion tool is retracted relative to the projection of the catch, for example when it is pressed against the workpiece, so that the journal can be supported on the edge of the slot, so that its reciprocating movement is transmitted to the insertion tool. During idle operation, the insertion tool is stationary during rotation of the motor and the catch, so that the wear on the motion transmission part is significantly reduced.

The tool is guided in the region of its clamping end in a longitudinal guide in a precise and low-friction manner, so that the influence of transverse forces and thus varying frictional forces occurring during operation on the drive mechanism and the housing is reduced.

Once the housings are screwed together, a longitudinal guide as a separate component is immovably mounted to the inside of the housing. The longitudinal guide means in the direction of movement of the guided insertion tool bears against a front wall of one of the housings, so that it is held in place without loss and without play, but at the same time is easily replaceable, since the longitudinal guide means can be removed from the front region of the housing after the housings have been separated slightly from one another.

Since the longitudinal guide is a separate component, it receives the bending forces transmitted to the housing via the handle of the insertion tool in a cassette-like manner and guides these forces further to the housing over a large area, so that the housing is subjected to only small bending and twisting forces. And can be designed to be lightweight. The rolling bodies at the two ends of the guide groove of the longitudinal guide avoid wear or friction between the longitudinal guide and the tool, so that here only rolling friction is present, not sliding friction.

The longitudinal guide has a roller body of a needle roller structure above the guide groove on its side facing the opening and a roller body of a needle roller structure below the guide groove on its side facing away from the opening, whereby twisting of the tool shank is avoided and rolling friction is ensured instead of sliding friction.

A sealing cap encloses an opening in the front region of the housing, which opening is penetrated by the shank of the insertion tool and serves as a sliding guide and damping for the insertion tool.

The insertion tool can be a chisel, blade, spatula or the like made of metal, for example hard metal or high-speed steel for increased durability. Such tools have a variety of uses, for example for scraping, removing paint, pasting paper, carpet glue, foam residues, needle felts, PVC, but also for cleaning work, for example removing residual dirt such as glue droplets, mortar, plaster, putty, glue, paint and silicon residues, mortar and cement residues on building boards, etc. Finally, a base layer preparation, such as preparation of seamless ground and cement, leveling of welds and projections, crack repair, and removal of floor tile glue, may also be performed.

The plug-in tool has a flat, in particular right-angled cross section in the region of the shank, which can be guided in a longitudinal guide, in particular in a flat groove, and the resilient floor spring receives the bending forces during the scraping operation. This prevents the insertion tool from rotating about its longitudinal axis and also elastically dampens the impact between the workpiece and the operator during operation of the scraper.

Since the insertion tool is a wear part, its quick replaceability is a great advantage. This advantage is achieved by the interaction of the latching element of the insertion tool with the latching element of the hand-held power tool. Both the hand-held power tool, in particular the hand-held power tool combined with the clamping mechanism and the guide mechanism, and the insertion tool have the inventive features.

In the following description, the invention will be described in detail with reference to some embodiments shown in the drawings. Wherein,

figure 1 shows an exploded view of one embodiment of a hand held power tool according to the present invention,

figure 2A is a longitudinal cross-sectional view of figure 1 with the section ii partially assembled,

figure 2B is a detail view of the end support of the drive shaft of figure 2A,

figure 3 is an enlarged view of some of the corresponding parts indicated by reference number iii in figure 1,

figure 4A is a longitudinal cross-sectional view of a portion of another embodiment of a hand held power tool in accordance with the present invention,

figure 4B is a detail view of the end support of the drive shaft of figure 2B,

figure 5 is an exploded view similar to figure 4 of some of the components of the machine tool of figure 4A,

fig. 6 and 7 are an elevation view and a plan view, respectively, of a plug-in tool, which is assigned to the machine tool shown in fig. 1 to 3, has a corresponding longitudinal guide and engages with a catch,

figure 8 is an exploded view of a longitudinal guide with rolling bodies,

figures 9, 10, 11 show several variants of a cartridge-type tool for a scraper,

figure 12 is a longitudinal section of another embodiment of the scraper before the assembly of the tool,

figure 13 is a view of the scraper machine shown in figure 12 after insertion of the plug-in tool,

fig. 14 is a detail view of the push button for releasing the insertion tool from the clamping position in the scraper.

Fig. 1 shows an exploded view of an embodiment of a hand-held electric power tool (scraper 10 for short) for scraping a workpiece, and fig. 2A is a partial longitudinal sectional view thereof. The cylindrical outer shell 11 is formed by two

plastic shell halves

12, 14, the rear part of the outer shell 11 having a thickened portion 30 and the front part having a neck portion 32 which is inclined with respect to the axis of the outer shell. The shell portion between the neck portion 32 and the thickened portion 30 is formed as a handle 28. The housing halves 12, 14 may be joined together by screws 26.

A cable, not shown, can be secured to the housing 11 by another screw 24 and clamped with a clamp. Inside the housing 11, a motor 16 is mounted, which is equipped with a fan wheel 18, the drive shaft 19 of which is mounted in a ball bearing 20 and is connected to a conical pinion 22 in a rotationally fixed manner. The pinion 22 meshes with a conical disk gear 48 which is non-rotatably mounted on a drive shaft 50, the axis of rotation 36 of the disk gear 48 being at right angles to the drive shaft 19.

The bearing point of the drive shaft 50 remote from the tool is formed by an annular slide bearing 40 which can be inserted into a cylindrical bearing seat 38 of the housing 12, a compression spring 42, a washer 44 and a ball 46, the ball 46 being seated in a central recess 43 in the upper end face of the drive shaft 50.

The bearing area of the drive shaft 50 close to the tool is formed by an annular bearing sleeve 56, an annular washer 54 and a rolling bearing or needle bearing 58.

An eccentric journal 52 (with eccentric axis 53) arranged on the tool-proximal end of the drive shaft 50 passes through the bearing sleeve 56, the free end of which is inserted from above into a bore 72 of a rod-like catch 68, the catch 68 being supported axially downward on a pressure button 76.

The distance of the eccentric axis 53 from the axis of rotation 36 determines the eccentricity, wherein the double eccentricity determines the lift H of the eccentric journal 52 or catch 68 (fig. 7).

An anti-rotation element 62 and a washer 66 are disposed between the latch 68 and the bearing housing 56, and a spacing spring element 64 is disposed therebetween. An anti-rotation element 62 in the form of a spacer or a toothed ring is fitted over the bearing sleeve 56 in a form-fitting manner. The button 76 closes an opening 60 in the lower housing 14 in a dust-tight manner and terminates there flush with the housing contour.

Behind a front opening 34 of the housing 11, a longitudinal guide 82 for a plug-in tool 88 is fixed in the interior of the housing 11, the opening 34 being formed by a corresponding shaping of the

housings

12, 14. In the region of the opening 34, a transverse wall 13 is arranged in the upper plastic housing 12, and this transverse wall 13 engages partially with the outer end face 82' of the longitudinal guide 82, preventing the longitudinal guide 82 from being unintentionally removed from the opening 34 or from being lost. The shank 89 of the insertion tool 88 can be moved in a straight line forwards and backwards in the longitudinal guide 82. The catch 68 is rotatably inserted from above by means of a projection 70 of a journal arrangement into a circular recess 90 of the clamping end 77 of a shank 89 of a plug-in tool 88. Once the drive shaft 50 rotates, the eccentric journal 52 will rotate about the axis of rotation 36, with the catch 68 acting with it. Since the projection 70 of the catch 68 is hinged in the recess 90 of the handle 89, the eccentric journal 52 only transmits its partial forward and backward movement to the insertion tool 88, so that the recess 90 can be circular or does not have to be formed as a slotted slot as shown in fig. 4A, 5.

Fig. 2A and 3 show that, in order to achieve a better low-friction bearing of the eccentric journal 52, the catch 68 is provided with a rolling bearing 73, in particular a needle bearing, in its bore 72 for the passage of the eccentric journal 52. The projections 70 cooperating with the recesses 90 are arranged at a distance axially parallel to the bore 72 or the roller bearing 73.

As shown in fig. 2A, the free end of the shank 89 abuts the hole 72 for the eccentric journal 52 on the rim of the flange 71' of the catch 68. The projection 70 here also serves to prevent the loss of the insertion tool 88, wherein the collar 71' can also transmit the movement of the eccentric journal 52 to the clamping end 77. In the stop position, the recess 90 in the clamping end 77 is positioned exactly flush with the projection 70 of the catch 68. This makes it possible to easily install the insertion tool 88, since when the insertion tool 88 is felt to be well stopped on the collar 71', it is ensured that the projection 70 engages in the recess 90, so that the correct clamping position of the insertion tool 88 is reached, so that the pressure button 76 can be released.

As can be seen from fig. 1 to 3, the catch 68 is mounted in a guided, elastically axially displaceable manner along the eccentric journal 52, and the projection 70 of the catch 68 can be disengaged from the recess 90 of the insertion tool 88 during its axial displacement, so that the insertion tool 88 can be disengaged from the drive. This allows the insertion tool 88 to be easily removed by hand for replacement.

The latch 68 is moved to the release position by a pressure button 76 that can be pushed by the finger of the operator. The pressure button 76 is movably mounted in the housing 14 in the opening 60 of the housing 11 like an engine piston in a cylinder, in which case the pressure button 76 can move in the same direction as the catch 68 (the pressure button 76 is supported on the catch 68).

Between the catch 68 and the lower housing 14 is mounted a pressure spring 64 which is flush and concentric with the drive shaft 50 and whose ends bear on the catch 68 and the pressure button 76 via an annular gasket 66 and press the pressure button 76 in its original position. The pressure spring 64 is supported relative to the latch 68. The annular washer 66 prevents the reciprocating motion of the latch 68 from being transmitted to the pressure spring 64.

It can also be seen that the pressure button 76 is prevented from falling out by means of

hooks

75, 79 which stop inside the housing 14. Radial ribs 8 and 9 are provided on the pressure button 76 for support relative to the link-like catch 68.

The insertion tool 88 is mounted in the longitudinal guide 82 with its portion between its working end 92 with a cutting edge and its clamping end 77. The longitudinal guide 82 has a structure (see also fig. 8) which surrounds the flat shank 89 of the insertion tool 88 in a box-like manner, thereby absorbing the transverse forces occurring during the machining. The longitudinal guide 82 is embodied as a cube or cuboid which can be inserted into the housing 11 and has a through-going, flat, right-angled guide slot 67 (see fig. 3 and 8) for the passage of a shank 89 of the insertion tool 88. The longitudinal guide 82 has a cutout 83 on the side facing the catch 68, which centers the head 65 of the catch 68 inserted in the recess 90 of the clamping end 77 of the insertion tool 88, and the catch 68 has a projection 70 which is inserted into the clamping end 77 of the insertion tool 88 and carries the insertion tool 88.

According to fig. 4A, 5, 6 and 8, the

longitudinal guides

82 and 87 have a transverse recess 81 and in the lower housing 14A recess 81' which is flush with the recess 81 and through which lubricant can be introduced when the tool is not inserted or through which the two

plastic housings

12, 14 can be connected or disconnected by means of a screwdriver. The longitudinal guide means 87 is influenced by the structure of the disc-shaped catch 69 without the cut-out 83, unlike the longitudinal guide means 82.

The longitudinal guides 82 and 87 do not have to be hexahedral, and may have different configurations as necessary.

Fig. 2B shows a detail of the upper support of the drive shaft 50 in the housing 11, as in fig. 4B, wherein the pressure spring 42, the central slot 43, the washer 44, the ball 46 and the upper part of the drive shaft 50 are clearly visible.

As can be seen from fig. 1 to 5, the bearing region of the drive shaft 50 facing the tool is formed by a bearing bush 56 which supports a rolling bearing 58, the bearing bush 56 being axially adjustable relative to a non-illustrated counter-ring wedge of the housing 14 by means of a ring wedge 57 which acts like a steep thread after the anti-rotation element 62 has been released and being accessible from the outside, for example by means of a screwdriver or the like, after the pressure button 76 and the catch 68 have been removed.

Instead of the annular wedge 57, the bearing bush 56 can also be provided with an external thread which has to be screwed into a matching internal thread on the housing side.

The anti-rotation part 62 of the bearing sleeve 56 is designed as an externally toothed snap ring which is snapped into two opposing grooves 59 on the lower outer side of the bearing sleeve 56 by two radial springs 61 on its inner side. The compression spring 64 is supported on the anti-rotation part 62, so that the anti-rotation part 62 tensions the compression spring 64 axially relative to the bearing sleeve 56 or the housing 11, thereby fixing it. The anti-rotation element 62, i.e. the snap ring, is connected in a rotationally fixed manner to the housing 14 via an external toothing, in particular projections, which engage with external toothings of the anti-rotation element 62, not shown in the figures, on the housing side, in order to prevent rotation of the bearing sleeve 56.

According to fig. 1 to 5, the

tool

88 or 188 projects through the opening 34 in the front region of the housing 11, which is closed by a sealing cap 86. The blade or working end 92 of the

insertion tool

88 or 188 may be provided with a protective sleeve 94 to protect the blade from damage and to prevent the user from being cut by the blade, particularly during transport of the scraper 10.

According to fig. 4A to 5, a catch 69 of the perforated plate arrangement is provided, which differs from the catch 68 of the link arrangement in fig. 1 to 3. An eccentric journal 51 of the drive shaft 50 is inserted into a central bore 72' of the catch 69, the eccentric journal 51 being significantly shorter than the eccentric journal 52 in fig. 1 to 3. This short dimension is necessary because the eccentric journal 51 is thus not directly engaged with the recess 91 of the clamping end of the insertion tool 188, so that the insertion tool 188 can be removed in the transverse direction of the eccentric journal 51 (movably past its free end).

The central bore 72' can also be equipped with a needle bearing 73, like the bore 72 in fig. 2A to 3, in order to transmit the movement of the eccentric journal 51 to the catch 69 and the insertion tool 188 with low wear.

An annular projection 71 of the catch 69, which is concentric with the recess 91, projects from the free end of the eccentric journal 51 and engages in a recess 91 of the clamping end 77 of the insertion tool 188, which is designed as a slotted hole. The slot 91 of the slotted arrangement is provided close to the free end of the clamping end 77, with its longitudinal extension being arranged transversely to the direction of movement of the insertion tool 188, and the stroke H being at least twice as long as the eccentricity of the eccentric journal 51 as the diameter of the eccentric journal 51. The width of the groove 91 is such that the projection 71 can be inserted into the groove without play. The handle 89 of the insertion tool 188 in fig. 4A is longer than in fig. 2A because the insertion point to the catch 69 is deeper inside the housing 11, but the position of the blade relative to the opening 34 of the housing 11 is consistent with the embodiment shown in fig. 2A, 3.

Fig. 6 and 7 show a plug-in tool 288 of the scraper 10 of fig. 1 to 3. The insertion tool 288 differs from the insertion tool 88 of fig. 1 to 3 in that it has a recess 93 in the clamping end 77, which is a slot extending in the longitudinal direction of the movement direction, the width of which depends on the size of the outer diameter of the journal 70, which is circular in cross section. Its longitudinal extension is greater than the outer diameter of the eccentric journal 52 by a distance H or more than twice the eccentricity of the eccentric journal 52. Thus, when the insertion tool 288 is subjected to a force applied from the front, it can only be moved or driven back and forth when the motor is rotating, so that the projections 70 can be jointly supported on the front edge 193 of the recess 90. Thus, once the insertion tool 288 is lifted from the workpiece, it stops moving, although the motor 16 is on. Thus, the loss of energy, the generation of noise and the wear on the longitudinal guide 82 and on all the components of the scraper 10 which transmit movement, for example between the catch 68 and the clamping end 77, are small. Furthermore, the recess 93 is further away from the free end of the clamping end 77 than the recess 91 of the plug-in

tool

188, 388, 488, 588 shown in fig. 4A, 5 and 9.

Fig. 8 shows an enlarged view of the longitudinal guide 82 from fig. 1. The longitudinal guide 82 is provided with

roller bodies

78 and 84, similar to a needle bearing, which are mounted in front of and behind the right-angled flat guide groove 67 and on which the

tools

88, 188, 288, 388, 488 and 588 are rollingly supported. The rolling

bodies

78 and 84 are mounted in corresponding grooves 85 of the longitudinal guide 82. By arranging the rolling

bodies

78 and 84 in this way, the sliding friction in the longitudinal guides 82 is greatly reduced, their load-bearing capacity is increased, the generation of heat and wear on the scraper 10 are reduced, and the bending stresses of the plug-in tools 88-588 are prevented by the housing 11.

The cooperation between the longitudinal guide 82 and the link-type latch 68 is illustrated in fig. 1, 2A, 3 and 7. The catch 68 has a head 65 provided with a projection 70, the head 65 being rotatably snapped into a cutout 83 as a guide groove of a longitudinal guide 82. It is thus ensured that when the scraper 10 is without the mounting

tools

88, 288 and in this situation the electric motor 16 is again activated, the head 65 and thus the catch 68 are now also guided in the housing 11.

Fig. 9, 10 and 11 each show a plug-in type tool, which are a cutting chisel 388, a wide scraper 488, and a spatula 588, for the scraper 10 shown in fig. 4A and 5.

Fig. 12 shows a scraper 100 according to the invention, which corresponds to a large extent to that shown in fig. 1, 2A and 3. The main difference is a pressure button 176 which is provided with two positioning tabs 177, 178 on its side adjacent to the tool, beside the hooks 175, 179. The detent tabs 177, 178 engage an edge 101 of the housing 111 when the pressure button 176 is moved axially upward into the release position and hold the pressure button 176 in place in this position. As the tool 288 is advanced into the longitudinal guide 182, the free end 77' of the gripping end 77 of the tool 288 passes over the locator cards 177, 178 after passing the projection 170 of the detent 168 and presses the locator cards 177, 178 out of their retaining positions. Whereby the pressure button 176 returns from the release position to its starting position.

When changing tools, the pressure button 176 does not have to be held in the pressed state until the projection 170 of the push rod 168 snaps into the

recesses

90, 93 of the detent 177 of the plug-in tools 88-588, but rather the user's hand is merely used to hold the scraper 100 securely.

Fig. 13 shows the scraper 100 of fig. 10 after the insertion tool 188 has been installed, in which the pressure button 176 has been moved back down into its starting position, and the projection 170 of the catch 168 has been inserted into the recess 93. As soon as the end 77 'of the clamping end 77 of the insertion tool 288 has stopped against the rim 71' of the catch 168, the projection 170 automatically snaps into this recess 93 under the force of the spring 164.

The longitudinal section of the longitudinal guide 82 is clearly visible in fig. 12 and 13, in which the front roller pin 84 is supported above the guide groove 67 and the rear roller pin 78 is supported above the guide groove 67 in the guide groove 82, so that bending of the shank 89 of the tool 288 by forces guided via the working ends 92 or cutting edges of the plug-in tools 88-588 during operation of the hand-held power tool is eliminated and rolling friction, rather than sliding friction, is ensured.

Fig. 14 shows a detail of the pressure button 176 with the positioning tab 177.178, wherein a clasp not shown in detail can also be seen.

In addition to the eccentric drive between the motor and the tool, which is described and illustrated in the exemplary embodiment of the scraper, other known variants of eccentric drives can also be used in order to convert the rotary motion of the motor into a reciprocating motion of the tool.

Claims

1. Hand-held electric power tool (10, 100) having a housing (11, 111) in which a motor (16) and a drive shaft (50) are arranged, and having an eccentric part (51, 52), in particular of eccentric journal construction, and having a reciprocatingly movable insertion tool (88, 188, 288, 388, 488, 588) which is connected to the eccentric part (51, 52) and has a clamping end (77) which is held in the housing (11, 111) and has a recess (90, 91, 93), wherein a motion-transmitting catch (68, 69) is arranged between the insertion tool (88, 188, 288, 388, 488, 588) and the eccentric part (51, 52), which catch (68, 69) interacts rotatably with the eccentric part (52) via a connection (72, 72'), in particular of bore construction, the locking device is characterized in that the catch (68, 69) is detachably inserted into a recess (90, 91, 93) of the clamping end (77) of the insertion tool (88, 188, 288, 388, 488, 588) by means of a projection (70, 71), in particular in the form of a journal.

2. Hand-held electric power tool according to claim 1, characterized in that the catch (68, 69) surrounds the eccentric part in the form of the eccentric journal (51, 52) with its connection in the form of a bore (72, 72') and is mounted so as to be displaceable in the longitudinal direction of the eccentric part, in particular guided along the eccentric part.

3. Hand-held electric tool machine according to claim 2, characterised in that the catch (68, 69) can be disengaged from the insertion tool (88, 188, 288, 388, 488, 588) by an axial movement, whereby the insertion tool (88, 188, 288, 388, 488, 588) is separated from the drive mechanism and can be easily removed from the housing (11, 111).

4. Hand-held power tool according to claim 3, characterized in that the machine has a pressure button (76, 176) with which the catch (68, 69) can be moved manually in the axial direction.

5. Hand-held electric tool machine according to claim 4, characterised in that the pressure button (76, 176) is supported on the catch (68, 69) and is mounted in the housing (11, 111) so as to be movable into the release position in the same direction as the catch (68, 69).

6. Hand-held electric power tool according to claim 5, characterized in that the pressure button (176) is provided with a latching hook (177, 178) which is fixed in a release position relative to the housing (111), in particular by latching an edge (101) located in the interior of the housing (111), the latching hook (177, 178) being released together with the insertion tool (288) when the insertion tool (288) is inserted into the shaving machine (100), and the catch (68) automatically being brought into the clamping position and the pressure button (176) being brought into its starting position when the tool (288) has reached the final position.

7. Hand-held electric power tool according to claim 6, characterised in that a spring (64) which is substantially aligned with the drive shaft (50) is supported, in particular via (66), between the catches (68, 69) and the housing (11, 111), the annular gasket pressing the catches (68, 69) and thus also the pressure buttons (76, 176) back into their starting position by means of the spring (64).

8. Hand-held power tool according to one of the preceding claims 2 to 7, characterized in that the catch (68) has a rolling bearing (73), in particular a needle bearing, in the bore (72) for the passage of the eccentric journal (52).

9. Hand-held power tool according to claims 1-8, characterised in that the catch (69) is disc-shaped, wherein the hole (72') and the projection (70) are arranged in alignment with each other.

10. Hand-held electric tool machine according to claim 9, characterised in that the recess (91) on the clamping end (77) of the plug-in tool (188) is a slot extending transversely to the direction of movement and having a diameter which is at least twice as large as the eccentricity of the eccentric journal (51) than the projection (71) inserted therein.

11. Hand-held power tool according to claim 10, characterized in that the recess 91 on the clamping end 77 of the insertion tool (188) has at least one diameter in the direction of movement which is greater than twice the eccentricity of the eccentric journal 51 than the projection 71 inserted therein.

12. Hand-held power tool according to claims 1-8, characterised in that the catch 68 is an elongated, rod-like construction with an opening (71) at one end and a projection (70) at the other end, which are arranged in particular axially parallel to each other.

13. Hand-held power tool according to claim 12, characterized in that the recess (90) on the clamping end (77) is circular, the projection (70) of the catch (68) being fitted substantially without play in the recess (90).

14. Hand-held electric tool machine according to claim 12, characterised in that the recess (93) of the clamping end (77) has a slot extending in the longitudinal direction in the direction of movement of the insertion tool (288), which is at least twice as long as the eccentricity of the eccentric journal (52) or its stroke H longer than the outer diameter of the projection (70, 71), in which slot the projection (70, 71) is mounted in an essentially transversely play-free manner.

15. Hand-held power tool according to one of claims 1 to 14, characterised in that the insertion tool (88, 188, 288, 388, 488, 588) is movably guided in a longitudinal guide (82) in the housing (11, 111), wherein its flat clamping end (77) is enclosed substantially without play.

16. Hand-held power tool according to claim 15, characterized in that the longitudinal guide (82) is a separate component which can be fixedly mounted in the housing (11, 111), in particular a cube or cuboid or the like, which has a through, in particular rectangular, guide slot (67) for the insertion of the insertion tool (88, 188, 288, 388, 488, 588).

17. Hand-held power tool according to claim 16, characterized in that the longitudinal guide (82) is provided with rolling bodies (78, 84) at both ends of the guide groove (67), on which the insertion tool (88, 188, 288) is rotatably supported.

18. Hand-held power tool according to claim 17, characterized in that the longitudinal guide (82) is provided on its side facing the opening (34) with a roller body of the needle roller (84) configuration above the guide groove (67) and on its side facing away from the opening (34) with a roller body of the needle roller (78) configuration below the guide groove (67).

19. Hand-held power tool according to claim 18, characterized in that the catch (68) is inserted, in particular with a head (65), into a cutout (83) and is mounted in a rotationally fixed manner on the longitudinal guide (82).

20. Hand-held power tool according to one of the preceding claims, characterized in that the plug-in tool (88, 188, 288, 388, 488, 588) protrudes from an opening (34) in a front region of the housing (11, 111) which is sealed by a sealing cap (86), wherein the sealing cap (86) is in particular sealingly supported on the plug-in tool.

21. Hand-held power tool according to one of the preceding claims, characterized in that the insertion tool (88, 188, 288, 388, 488, 588) has a cutting edge extending transversely to its direction of movement, which serves as a chisel, spatula or the like.

22. Plug-in tool for a hand-held power tool according to the preamble of claim 1, in particular according to claim 1, characterized in that the shank (89) of the plug-in tool (88, 188, 288, 388, 488, 588) has a flat, in particular rectangular, cross section, which can be guided in a longitudinal guide (82), in particular in a flat guide groove (67), substantially without play.

23. A cartridge tool according to claim 21, characterised in that the recess (91) in the clamping end (77) of the cartridge tool (188) is a slot extending transversely to the direction of movement thereof for the articulated engagement of the projection (71) of the catch (69) which is at least longer than the diameter of the projection (71) by the stroke H.

24. A cartridge tool according to claim 21, characterised in that the recess (90) in the clamping end (77) of the cartridge tool (88) is round and has at least the same diameter as the projection (70) of the detent (68).

25. A cartridge tool according to claim 21, characterised in that the recess (93) in the clamping end (77) of the cartridge tool (288) is a slot extending in the longitudinal direction in the direction of movement of the cartridge tool 288(288), which is at least longer than the outer diameter of the projection (70) by the stroke H of the eccentric journal (52), and in which the projection (70) is accommodated essentially without play in the transverse direction.