EP1537948B1 - Portable power tool - Google Patents

Description

State of the art

The invention relates to a hand tool according to the preamble of claim 1.

From DE 195 47 332 A1 discloses a generic type hand tool is known, the cylindrical housing consists of two plastic housing shells whose edges each form a dividing edge, which define a horizontal plane of division. The housing shells are connected by screws. Inside the housing, a motor is arranged with a fan, the drive shaft is mounted on a ball bearing in the housing shells and rotatably connected to a tapered pinion. The pinion meshes with one of an output shaft rotatably supported conical ring gear whose axis of rotation is perpendicular to the drive shaft.

The output shaft has a tool-remote bearing point, which has a ring-like plain bearing, which in a cylindrical Bearing receiving a housing shell is used. Furthermore, the output shaft has a tool-near bearing point, which has a sleeve-like bearing bush with a needle bearing.

An eccentric pin carried by the tool-near end of the output shaft protrudes through the bearing bush from above into a bore of a connecting rod-like driver, which engages with a projection in a recess of an insert tool which is mounted on a guide bearing in the front region of the housing shells.

Advantages of the invention

The invention relates to a hand tool with a housing having at least a first and a second, longitudinally extending housing shell in which a motor is mounted, which is coupled via a drive shaft with a transmission, via an output shaft with an insertion tool is in active connection.

It is proposed that the transmission is arranged in a gear housing with at least one sleeve, in which a pin of the first housing shell and a pin of the second housing shell are at least positively and preferably non-positively inserted.

In addition to a particularly advantageous absorption of bearing forces in the gear housing, a particularly dimensionally stable hand tool machine can be achieved and a gaping of the housing shells can be avoided during heavy use. The inventive Solution can be used in all hand-held power tools with transmission housings that appear to be suitable for a person skilled in the art and, in particular, in a hand-held power tool with an angle drive.

The housing shells are advantageously joined together in a horizontal working position in a horizontal dividing plane. A housing shell can be used as a mounting shell, the assembly can be simplified and the dimensional stability can be increased. Furthermore, it can be avoided that a user with large holding forces in the region of the division plane must act on the hand tool, whereby, for example, with a so-called soft grip a particularly comfortable gripping can be achieved. In principle, however, the housing shells can also be joined together in a vertical dividing plane or else in other graduation planes.

The pins are advantageously formed by screw domes. Additional components can be avoided or no additional parts must be molded to the housing shells. In one embodiment of the invention it is proposed to form pinch ribs on the pin. In particular, plastic housing shells can thereby advantageously adapted to a metal gear housing, tolerances can be compensated and it can be achieved a particularly secure connection. The crush ribs can be easily molded to the plastic pins and are preferably about 0.2 mm high.

The sleeve can be fixed non-positively, positively and / or cohesively on the transmission housing, but is advantageous molded to the transmission housing. In order to avoid a subsequent machining and to increase the adhesion, the sleeve is designed with a double inner cone, in which the pins are plugged with correspondingly shaped counter-outer cone.

It is also proposed that the motor is operatively connected via the drive shaft with a bevel gear, which has a stored output shaft which is operatively connected via an eccentric and a driving element with a reciprocally movable insert tool, wherein the angle gear arranged in a separate gear housing is. The gear housing can advantageously be made of a material, in particular bearing loads, adapted material, and particularly advantageous from a metal, such as in particular die-cast aluminum. However, it is also possible to produce the gear housing from a particularly durable plastic.

Furthermore, in addition to absorbing bearing forces, the gear housing can advantageously be used to form particularly stressed areas of the housing, in particular in the front region of the handheld power tool. The hand tool can be performed by a plastic housing easily and by an aluminum front or aluminum snout particularly resilient, on the heat also particularly advantageous from the power tool delivered to the environment and a required cooling capacity can be kept small.

In one embodiment of the invention it is proposed that a cover of the transmission housing in the front, lower area forms a part of the housing. The front, lower region of the hand tool is usually heavily loaded during operation, in particular in hand tool machines, which are bent down in the front region and thus are guided close to the surface to be machined. The gear housing cover can be made of a particularly durable material, such as aluminum die casting in particular, and also can be realized by the lid a particularly simple and inexpensive installation. In addition, the rear part of the housing can advantageously be designed to be detachable independently of the cover, whereby, for example, when replacing coals of the engine, power lines or grommets disassembly of the front portion and the insert tool can be avoided. In order to connect the lid as safely as possible to the hand tool with little additional effort, advantageously used by casting a housing shell pins used to make a positive connection and possibly a positive connection between the lid and housing shell. In the transmission housing many bearings are preferably integrated, in particular bearings for the drive shaft, the output shaft and / or for the insert tool. The bearings can be made to each other particularly precise position and after the manufacture, in particular after the casting of the gear housing, be reworked in one setting. Misalignment can be avoided, wear can be reduced and life can be increased. Furthermore, large bearing forces, in particular in a guide bearing of the insert tool can be advantageously supported in the gear housing, which can be produced from a particularly resilient material. To use as few additional fasteners a secure connection between the To achieve guide bearing and the gear housing, it is proposed that at least a portion of the gear housing and at least a portion of the guide bearing interlock with each other, for example, can engage the guide bearing molded pins in openings of the gear housing and / or it can be formed on the gear housing pin in openings of the guide camp.

A bearing of the drive shaft is advantageously used in a cup-shaped recess in the transmission housing. Different thermal expansions by different materials can be avoided and thereby caused tilting of the drive shaft can be prevented. In one embodiment, it is proposed that the bearing of the drive shaft is supported over a part of its length in the radial direction via a sliding seat directly in the gear housing and over part of its length in the radial direction via a plastic ring in the gear housing, preferably over about 1 / 3 of its length over the sliding seat and about 2/3 on the plastic ring or a rubber ring. The drive shaft is securely fixed by the sliding seat and can also be damped advantageous over the rubber ring in the bearing or vibrations and shocks can be compensated by the rubber ring. Further, an outer ring of the bearing through the plastic ring or rubber ring, which can compensate for tolerances of the sliding seat, are fixed radially and rotationally fixed by a clamp. In the axial direction, the drive shaft bearing is advantageously fixed via a housing part, whereby additional components, space, installation costs and costs can be saved. Retaining elements can be simple and inexpensive be molded to screw dome of the housing, which often protrude into the interior of the housing.

In addition to at least one radial bearing point of the output shaft, at least one adjusting means is advantageously mounted in the gearbox housing, via which the output shaft is axially adjustable relative to the gearbox housing and the gear play is adjustable. The adjusting means can be guided in particular positional accuracy to the output shaft and in particular to the first radial bearing point. In a further embodiment of the invention, the adjusting means is designed as a bearing bush, in which a second bearing of the output shaft is used. Additional components can be avoided and weight, space, installation costs and costs can be reduced. Furthermore, the output shaft can be stored radially and axially particularly precise.

The adjusting means can act on the output shaft via various adjusting mechanisms which appear to be suitable to a person skilled in the art and fastened to the gearbox by means of various devices, for example via a thread etc. However, the adjusting means particularly advantageously has at least one annular wedge on an axial surface, to which a housing-side counterpart Ring wedge is assigned as support surface. The adjusting means is preferably pressed with the ring wedge against the counter-ring wedge on at least two screws acting on their screw heads each on a clamping surface of the actuating means and on a bearing surface of the gear housing, wherein the clamping surface moves with increasing ring wedge in the axial direction and thereby the Adjusting path compensates. Due to the screws can advantageously the gear housing cover be mounted independently of the actuating means. A push button, acted on in the region of the output shaft on the driving element and the insert tool can be released from its locking connection can advantageously already before the assembly of the lid inserted into this and a subsequent insertion of the push button can be avoided. The assembly can be simplified and elastic locking means, in particular on the push button, can be saved.

By the bearing surfaces on the gear housing can be avoided that the screws tilted when adjusting the actuating means and the threads are destroyed. In order to be able to use the bearing surfaces in all adjusting positions, the clamping surface advantageously compensates for the adjusting movement, so that the screw heads can always act on the bearing surfaces and on the clamping surface in the setting positions. The clamping surface is preferably designed step-shaped, whereby flat bearing surfaces for the screw heads can be achieved.

In order to avoid a rotation of the actuating means, the adjusting means is fixed in the circumferential direction with an anti-rotation device, which is preferably formed on the actuating means. Additional components can be avoided.

In one embodiment, the adjusting means is further used to seal the gear housing to the outside by a groove for a seal is introduced in the region of a bearing surface of the actuating means in the gear housing and / or in the actuating means.

As an alternative to the screws, the adjusting means can advantageously be pressed against the gearbox housing via a disc spring or fixed axially thereon. The plate spring is preferably connected in the circumferential direction in a form-fitting manner via a first toothing with the adjusting means and via a second toothing with an adjacent component, e.g. with the bearing cap or gear housing cover, which structurally simple anti-rotation of the actuating means during operation and adjustment in the circumferential direction can be achieved.

In addition to the housing shells of the gear housing cover is advantageously inserted with at least one pin in a sleeve and thus can be attached very securely and contribute to the dimensional stability.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown.

Fig. 1

einen Längsschnitt durch eine erfindungsgemäße Handwerkzeugmaschine,

Fig. 2

eine geöffnete Handwerkzeugmaschine nach Fig. 1 von unten,

Fig. 3

einen vergrößerten Ausschnitt III aus Fig. 1 mit einem montierten Einsatzwerkzeug,

Fig. 4

einen Ausschnitt des vorderen Bereichs einer Handwerkzeugmaschine nach Fig. 1 vor der Montage einer oberen Gehäuseschale,

Fig. 5

einen Ausschnitt des vorderen Bereichs nach Fig. 4 nach der Montage der oberen Gehäuseschale,

Fig. 6

ein Getriebegehäuse schräg von unten,

Fig. 7

einen Schnitt durch eine Hülse bei der Montage,

Fig. 8

ein Führungslager schräg von oben,

Fig. 9

ein Stellmittel schräg von unten und

Fig. 10

ein Stellmittel schräg von oben.

Show it:

Fig. 1

a longitudinal section through a hand tool according to the invention,

Fig. 2

an open hand tool according to Fig. 1 from below,

Fig. 3

an enlarged detail III of FIG. 1 with a mounted insert tool,

Fig. 4

1 shows a detail of the front region of a hand-held power tool according to FIG. 1 before the assembly of an upper housing shell;

Fig. 5

a section of the front portion of FIG. 4 after mounting the upper housing shell,

Fig. 6

a gear housing obliquely from below,

Fig. 7

a section through a sleeve during assembly,

Fig. 8

a guide bearing diagonally from above,

Fig. 9

an adjusting means diagonally from below and

Fig. 10

an adjusting means diagonally from above.

Description of the embodiment

Fig. 1 shows a longitudinal section through a hand tool according to the invention for scraping processing of surfaces, referred to as scraper. The hand tool has a motor 10 arranged in a housing 12, which is electrically supplied via electric cable 100 and switched on and off via a switch 102. The electric motor 12 is operatively connected via a drive shaft 14 with a fan 104 and with an angle gear 16, namely on the drive shaft 14, a pinion 106 is fixed, which meshes with a driven shaft 18 of a driven gear 108 whose axis of rotation perpendicular to the drive shaft 14th runs. At the downwardly facing end of the output shaft 18, an eccentric pin 20 is formed, which engages in a connecting rod-like driving element 22 and an integrally formed pin 114 in a slot 116 of an insert tool 112 (FIGS. 2 and 3). The eccentric pin 20 is mounted via a roller bearing 134 in the driving element 22. Through the slot 116, the motion is transmitted from the drive shaft 14 via the driving element 22 on the insert tool 112 only when the insert tool 112 is placed on a work surface and pushed back so far that the pin 114 is supported on the edge of the slot 116 and so his back - And heroning movement on the insert tool 112 can transmit. At idle, the insert tool 112 is stationary when the drive shaft 14 rotates, so that the wear on the movement-transmitting parts is reduced. Injuries due to a moving insert tool 112 are avoided. Furthermore, the idle running tool 112 can be selectively placed at a desired location on the surface to be machined.

According to the invention, the angle gear 16 is arranged in a separate gear housing 24 made of diecast aluminum, which forms a second part of the housing 10 or outer walls of the power tool in a front, upper portion 26 a first part and a cover 28 in the front, lower portion 26.

In the gear housing 24 more bearings are integrated. The drive shaft 14 of the electric motor 12 is connected to a first end facing away from the insert tool 112 via a bearing 118 and via a component 120 in a first upper plastic housing shell 78 stored. A second, the insert tool 112 facing the end of the drive shaft 14 is mounted via a bearing 32 in a cup-shaped recess 34 in the gear housing 24. The bearing 32 is supported in the radial direction about 1/3 of its length via a sliding seat 36 directly in the gear housing 24 and about 2/3 of its length in the radial direction via a rubber ring 38 in the gear housing 24. In the axial direction, the bearing 32 is fixed via a retaining rib 40 in the cup-shaped recess 34, which is integrally formed on a screw dome of the upper housing shell 78 and slides during assembly in front of the cup-shaped recess 34 (FIGS. 4 and 5).

Furthermore, the output shaft 18 is mounted at its upper end facing away from the insert tool 112 with a first bearing 30 directly and at its second end facing the insert tool 112 with a second bearing 46 via a trained as adjusting means 44 bearing bush in the gear housing 24.

The adjusting means 44 is mounted via a bearing surface 70 in a cylindrical recess 142 in the transmission housing 24 (FIGS. 1, 4, 5, 6, 9 and 10). On a side facing away from the insert 112 axial surface 48 of an integrally formed collar 122, the adjusting means 44 has a ring wedge 50, which is associated with a housing-side counter-ring wedge 52 as a support surface. The ring wedge 50 is pressed by two screws 54, 56 against the counter-ring wedge 52 which act via their screw heads 58, 60 respectively on a clamping surface 62 of the actuating means 44 and bearing surfaces 64 of the gear housing 24, which are formed by webs. In order to avoid a 180 ° twisted mounting of the actuating means 44, the swept angle 144 from the first screw 54 to the second screw 56 and from a first screw dome 146 to a second screw dome 148 not equal to 180 ° (FIGS. 2 and 6).

The clamping surface 62 moves with increasing ring wedge 50 in the axial direction and thereby compensates for the adjustment. The screw heads 58, 60 always act on the clamping surface 62 and on the support surfaces 64 in the setting positions. The clamping surface 62 is formed by steps 66 which run parallel to bearing surfaces of the screw heads 58, 60 in the setting positions.

By loosening the screws 54, 56 and by rotating the actuating means 44, the output shaft 18 can be adjusted axially and thereby the gear play can be adjusted. In order to avoid undesired rotation during operation, an anti-rotation device 68 is integrally formed on the collar 122 of the actuating means 44, in the form of indentations which, when the screws 54, 56 are completely screwed in, enclose them positively in the adjustment direction. In order to achieve a good guidance of the actuating means 44 and to avoid tilting, a recess 72 is made in the gear housing 24 in the region of the collar 122. Furthermore, in the area of the bearing surface 70, a not-shown groove for a seal in the adjusting means 44 and / or in the gear housing 24 may be introduced to further improve a good already by the long bearing surface 70 sealing effect and to avoid lubricants penetrate the transmission housing 24 to the outside.

In addition, a U-shaped guide bearing 42 for the insert tool 112 is fastened to the gear housing 24 in the front region 26 by means of a screw 124 (FIGS. 3 and 8). In the mounted state, pins 150, 152 integrally formed on the gear housing 24 engage in a form-fitting manner in recesses 156, 158 of a cover side 154 of the guide bearing 42 (FIGS. 6 and 8). The guide bearing 42, which is produced from a hardened steel sheet in a stamping and bending process, is supported on the transmission housing 24 by end faces 160 of its legs. The guide bearing 42 is thereby positively positive and non-positively connected to the gear housing 24 and a post-processing of the bearing surfaces or bearing surfaces 160 of the guide bearing 42 after the punching and bending process can be avoided. Between the legs of the U-shaped guide bearing 42, the driving element 22 is also guided against rotation (Fig. 2).

The insert tool 112 is slidably mounted in the guide bearing 42 by four designed as needles rolling elements 126 in the longitudinal direction, which are guided in slots 128 and held captive over a retaining plate 162 before mounting the guide bearing 42 on the gear housing 24. The retaining plate 162 can be latched into the U-shaped guide bearing 42 with integrally formed projections 164 in recesses 74.

In the direction of the work area, the power tool is sealed by a protective cap 130 with a felt seal 132, which is positively inserted between the gear housing 24 and the cover 28, namely the gear housing 24 and the cover 28 engage between two circumferential beads of the protective cap 130th Die Schutzkappe 130 is special easy to assemble and particularly tear-resistant connected to the power tool. The insert tool 112 protrudes through the protective cap 130 to the outside. The protective cap 130 is protected from wear or abrasion on the surface to be processed by the cover 28 and by the gear housing 24.

To replace the insert tool 112, the entrainment element 22 can be displaced by a pushbutton 110 along the eccentric pin 20 against a compression spring 136, which is supported in an indentation 138 on the adjustment means 44. The bolt 114 shifts from the slot 116 of the insert tool 112, which can be removed without tools and an alternative insert tool can be used.

The housing 10 has in addition to the first upper housing shell 78, a second lower plastic housing shell 80, which are assembled in a horizontal working position in a horizontal dividing plane 140 (Fig. 2). Four sleeves 82, 84, 86, 88 are integrally formed on the gear housing 24, into which four pins 90 of the upper housing shell 78 are positively and positively inserted from above (FIGS. 2, 6 and 7). Further, two pins 92 facing away from the lower housing shell 80 and into the two, the insert tool 112 facing sleeves 86, 88 two pins of the cover 28 form-fitting and frictionally inserted from below into the two, the insert tool 112 facing sleeves 82, 84. The pins 90, 92 of the housing shells 78, 80 and the pins of the cover 28 are formed by screw domes over which the housing shells 78, 80, the cover 28 and the gear housing 24 are screwed together via screws not shown. The housing shell 80 In addition, it engages in a form-fitting manner via two pins 76 formed at sprue locations in two openings (not shown) of the cover 28.

In order to avoid a subsequent machining and to increase the adhesion, the sleeves 82, 84, 86, 88 are each carried out with a double inner cone 98, in which the pins 90, 92 of the housing shells 78, 80 and the pins of the lid 28 with correspondingly shaped Counter-outer cones 96 are plugged. Furthermore, pinch ribs 94 are integrally formed on the pins 90, 92, whereby the pins 90, 92 to the sleeves 82, 84, 86, 88 can adjust and a particularly advantageous Kraftund positive engagement can be achieved.

reference numeral

10

casing

12

engine

14

drive shaft

16

angle gear

18

output shaft

20

eccentric

22

driving element

24

gearbox

26

Area

28

cover

30

camp

32

camp

34

recess

36

sliding seat

38

Plastic ring

40

housing part

42

guide bearing

44

actuating means

46

camp

48

area

50

annular wedge

52

Mating annular wedge

54

screw

56

screw

58

screw head

60

screw head

62

clamping surface

64

bearing surface

66

step

68

twist

70

storage area

72

puncture

74

recess

76

spigot

78

shell

80

shell

82

shell

84

shell

86

shell

88

shell

90

spigot

92

spigot

94

squeezing

96

outer cone

98

Against double inner cone

100

electric cable

102

switch

104

fan

106

pinion

108

crown

110

pushbutton

112

application tool

114

bolt

116

Long hole

118

camp

120

component

122

Federation

124

screw

126

rolling elements

128

hole

130

protective cap

132

felt seal

134

roller bearing

136

compression spring

138

indentation

140

parting plane

142

recess

144

angle

146

screw dome

148

screw dome

150

part

152

part

154

part

156

recess

158

recess

160

front

162

Halteblech

164

head Start

Claims (27)

1. Powered hand tool having a housing (10), which has at least one first and one second housing shell (78, 80) extending in the longitudinal direction, in which is mounted a motor (12) which is coupled via a drive shaft (14) to a gearing (16) which is operatively connected via an output shaft (18) to an insert tool (112), characterized in that the gearing (16) is arranged in a gearbox (24) with at least one sleeve (82, 84, 86, 88), into which a pin (90) of the first housing shell (78) and a pin (92) of the second housing shell (80) are inserted at least in a positive-locking manner.
2. Powered hand tool according to Claim 1, characterized in that the first and the second housing shell (78, 80) are joined together in a horizontal parting plane (140) in a horizontal working position.
3. Powered hand tool according to Claim 2, characterized in that the pins (90, 92) are formed by screw domes.
4. Powered hand tool according to Claim 2 or 3, characterized in that crush ribs (94) are integrally formed at least on one pin (90, 92).
5. Powered hand tool according to one of the preceding claims, characterized in that the sleeve (82, 84, 86, 88) is integrally formed on the gearbox (24).
6. Powered hand tool according to Claim 5, characterized in that the pins (90, 92) have an external taper (96) narrowing towards the free end, and the sleeve (82, 84, 86, 88) is designed with a correspondingly shaped mating double internal taper (98) .
7. Powered hand tool according to any of the preceding claims, wherein the motor (12) is operatively connected via the drive shaft (14) to angular gearing (16) which has a mounted output shaft (18) which is operatively connected via an eccentric (20) and a driving element (22) to an insert tool (112) movable in a reciprocating manner, the angular gearing (16) being arranged in a separate gearbox (24).
8. Powered hand tool according to Claim 7, characterized in that the gearbox (24) is made of metal.
9. Powered hand tool according to Claim 7 or 8, characterized in that the gearbox (24), in the front region (26), forms at least part of the housing (10).
10. Powered hand tool according to Claim 9, characterized in that a lid (28) of the gearbox (24), in the front, bottom region (26), forms part of the housing (10).
11. Powered hand tool according to Claim 10,
    characterized in that a housing shell (80), with at least one pin (76) formed at a gate mark, engages in an opening of the lid (28) in a positive-locking manner.
12. Powered hand tool according to Claim 10 or 11, characterized in that a protective cap (130) is inserted in a positive-locking manner between the gearbox (24) and its lid (28).
13. Powered hand tool according to one of the preceding claims, characterized in that at least one bearing (30) of the output shaft (18) and one bearing (32) of the drive shaft (14) are arranged in the gearbox (24).
14. Powered hand tool according to Claim 13, characterized in that the bearing (32) of the drive shaft (14) is inserted into a pot-shaped recess (34) in the gearbox (24).
15. Powered hand tool according to Claim 14, characterized in that the bearing (32) of the drive shaft (14) is supported over part of its length directly in the gearbox (24) in the radial direction via a sliding fit (36) and is supported over part of its length in the gearbox (24) in the radial direction via a plastic ring (38).
16. Powered hand tool according to one of Claims 13 to 15, characterized in that the bearing (32) of the drive shaft (14) is fixed in at least one axial direction via a housing part (40).
17. Powered hand tool according to one of the preceding claims, characterized in that at least one guide bearing (42) of the insert tool (112) is fastened to the gearbox (24).
18. Powered hand tool according to Claim 17, characterized in that at least one part (150, 152) of the gearbox (24) and at least one part (154) of the guide bearing (42) engage in an interlocking manner.
19. Powered hand tool according to one of the preceding claims, characterized in that at least one adjusting means (44) is mounted in the gearbox (24), via which adjusting means (44) the output shaft (18) can be axially adjusted relative to the gearbox (24) and the gear backlash can be set.
20. Powered hand tool according to Claim 19, characterized in that the adjusting means (44) is designed as a bearing bush and accommodates a second bearing (46) of the output shaft (18).
21. Powered hand tool according to Claim 19 or 20, characterized in that the adjusting means (44), at an axial surface (48), has at least one annular wedge (50), to which a housing-side mating annular wedge (52) is assigned as supporting surface, and is pressed with the annular wedge (50) against the mating annular wedge (52) via at least two screws (54, 56), which act via their screw heads (58, 60) on a respective clamping surface (62) of the adjusting means (44) and on a seating surface (64) of the gearbox (24), the clamping surface (62), with rising annular wedge (50), being displaced in the axial direction and compensating for the adjusting travel.
22. Powered hand tool according to Claim 21, characterized in that a swept angle (144) between screw domes (146, 148) of the two screws (54, 56) is not equal to 180°.
23. Powered hand tool according to Claim 22, characterized in that the clamping surface (62) is formed by steps (66).
24. Powered hand tool according to one of Claims 19 to 23, characterized in that the adjusting means (44) is designed in one piece with an anti-rotation locking means (68).
25. Powered hand tool according to one of Claims 19 to 24, characterized in that, in the region of a bearing surface (70) of the adjusting means (44), a groove for a seal is incorporated in the gearbox (24) and/or in the adjusting means (44).
26. Powered hand tool according to Claim 19 or 20, characterized in that the adjusting means is pressed against the gearbox (24) via a flat spring and is fixed in a rotationally locked manner during operation via the flat spring.
27. Powered hand tool according to one of Claims 1 to 5 and one of Claims 10, 11, 12 or 26, characterized in that the lid (28) of the gearbox (24) is inserted with at least one pin into a sleeve (86, 88) of the gearbox (24).

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