FR2778589A1 - PORTABLE SUPPORT MACHINE TOOL - Google Patents

Abstract

Hand-held machine tool (10), in particular a jigsaw preferably comprising a tight tool (24) which can be placed in an inclined position relative to the work, comprising a housing (12) housing a motor (18) and a transmission (20) coupled to the motor and a handle (14) as well as a trigger (16) for connecting or cutting the motor (18), transforming the movement of the motor into a movement, in particular a reciprocating movement of the tool (24) and the housing (12) rests on a plate (38) which can be adjusted in particular angularly with respect to the housing (12) by means of a clamping means (42, 44, 50, 52, 54). clamp (52), with an eccentric head (50) can be tilted out of the plane of the plate, downwards and constitutes a clamping means for loosening and for blocking the plate (38) relative to the housing (12).

Description

STATE OF THE ART The present invention relates to a machine tool with

  hand, in particular a jigsaw preferably comprising a tight tool which can be placed in an inclined position relative to the work, comprising a housing housing a motor and a transmission coupled to the motor and a handle thus

  than a trigger to connect or cut the engine, transforms

  mant the movement of the motor in a movement, in particular alter-

  native to the tool and the housing rests on a plate which

  can be adjusted in particular angularly with respect to the box

  tier (12) by means of a clamping means.

  According to document EP 0 603 552, such a power tool or portable machine tool is already known, comprising a clamping device for pinching the plate or support plate; in this machine, by turning a knurled wheel, by hand, without using any special tool,

  you can loosen and detach from the rear end

  machine, and by turning the knurled wheel,

  on a reduction using the toothed pinion drive link. The clamping device is practical and easy to handle; however, its manufacture

is relatively expensive.

  Advantages of the invention The object of the present invention is to remedy these drawbacks and to this end relates to a portable machine tool of the type defined above, characterized in that a clamping lever, in particular with an eccentric head which can be tilted out of the plane of the plate, in particular downwards and constitutes a clamping means for loosening and for

  lock the plate in relation to the housing.

  The machine tool according to the invention offers the advantage of a clamping device making it possible to release

  or block the plate in relation to the housing of the

  china-portable tool, and to be composed only of a name-

  short of simple parts to manufacture, which are robust and also practical to actuate and fast without requiring any special tool. This simpler construction facilitates

  use of the machine and makes it less tiring

  guante. The simplification of the structure of the clamping device results from a clamping lever pivotally mounted with a head eccentric relative to the plane of the plate, and which, with the eccentric head, serves only as a clamping means without tools for loosening and locking the plate in a position

desired in relation to the housing.

  As the clamping lever is positioned parallel-

  lement to the plate to lock it, in the contour in

  below the lower side, it can pivot projecting in

  loosening position with respect to the plate, it may have a more advantageous lever arm, which is always easy to

find and convenient to handle.

  As the clamping lever is pivotally coupled

  ment by a pivot pin to a clamping pin, the latter

  deny being attached to the housing and passing through an opening in the

  platinum, it allows easy manipulation

machine tick.

  As the opening of the tightening pin is reali-

  in the form of an oblong hole transverse to the direction of advance of the power tool, the plate

  can be adjusted angularly with respect to the housing.

  The clamping lever carries in the region of its pivot axis, an eccentric head with an eccentric contour

  relative to the pivot axis, whose clamping surface ex-

  centered is directed transversely to the pivot axis or the longitudinal axis of the clamping lever and the eccentric surface of which is transverse to the pivot axis,

  as well as with respect to the longitudinal axis of the lever

  rage. Thus, starting from the clamping position, one can pass

  in the released position within a pivot range of the

clamping clamp of about 90.

  As the eccentric head is supported in particular by a support disc against the underside of the plate,

  preferably from the opposite bearing surface, you get a

  close to the point of use.

  As the clamping lever protrudes in the position of

  clamping parallel to the plate, with its handle, relative to

  port at the rear end of the plate, it can be tilted from the rear to its operating position without having to lift the tool for this and without having to drive the hand

  which ensures the actuation, from below against the plate.

  As the clamping lever is pressed inside

  of the contour of the plate against fixing ribs, no-

  both by force connection and preferably by form connection in its clamping position, it may accidentally tip over into its actuation position or

its loosening position.

  As the antagonistic bearing surface of the plate

  tine carries in the manner of a row of teeth, radial projections regularly spaced apart, and to which correspond at least one projection and preferably several cavities of opposing projections, distributed along a row of teeth

  in the contour of the bearing surface of the housing, and which serves

  wind by interlocking with blocking by a form link

  of the housing in relation to the plate in the different po-

  adjustable angular positions, this allows to realize

  particularly simple way of preferred angular positions. As the eccentric head surrounds in the manner of a fork the clamping pin and pivots in common with the pivot axis relative to the latter, there is a mode

  particularly simple and easy to implement

  tightening clamp or the clamping lever according to which the

  clamping bolt, despite the wall thicknesses in the fork area, is only exposed to low wear, as there is no relative movement or friction between the pivot axis

and the clamping lever.

Drawings

  An exemplary embodiment of the invention will be shown

  crit below in more detail using the accompanying drawings in which: - Figure 1 is a longitudinal section of a jigsaw according to the invention, - Figure 2 shows a detail on an enlarged scale of the section

  longitudinal in Figure 1, with a tightening lever

  dified compared to that of Figure 1, shown in two positions, - Figure 3 is a cross section of the jigsaw

  of figure 1 in the area of the clamping lever in posi-

loosening tion,

  - Figure 4 shows the cross section of the saw

  teuse of Figure 3 in the clamping position of the clamping lever, Figure 5 is a bottom view of the plate according to Figure 1 in the release position of the clamping lever,

  - Figure 6 is a bottom view of the plate of the

  gure 1 in the clamping lever clamping position, - Figure 7 is a partial longitudinal section of the clamping lever, with the clamping pin as a detail in Figure 1, - Figure 8 is a partial longitudinal section along the

  Figure 7, but rotated 90 relative to the longitu-

  dinal and taken perpendicular to the clamping pin.

  Description of the exemplary embodiment

  According to FIG. 1, a portable machine tool in the shape of a jigsaw 10 consists of a housing or a body 12 with an upper zone and a lower zone 12a, 12b, a front zone and a rear zone 12c, 12d . In its upper zone 12a, the housing 12 comprises a handle 14 provided in the advantageous zone for gripping by hand, with a trigger 16. The housing 12 receives in its middle a motor 18 and a transmission 20 coupled to the motor. The transmission 20 transforms the rotational movement of the engine

  18 in an alternating movement (up and down movement

  cente) of a drive rod 22 housed sliding vertically

securely in the housing 12.

  The lower part of the drive rod 22 carries a saw blade 24 with teeth 25. This blade is removably clamped. This blade goes up and down following

  the drive rod 22 when the jigsaw 10 operates

  tion. At the rear 12d of the jigsaw, an electric cable 26 supplies the motor 18; a suction nozzle 28 of a suction channel 32 comes out of the housing 12, the rear side being taken relative to the direction of advance 30. The housing 12 is supported with its lower part

  12b via a bearing surface 34 on a surface

  opposite bearing face 36 on the upper side of a plate 38.

  The bearing surface 34 is straight in the direction of advance with a concave curvature. The bearing surface 36 of the plate 38 is also straight in the direction of advance 30

  with a strongly convex curvature.

  The plate 38, the lower surface 39 of which rests on the work, not shown, has, in alignment with the saw blade 24, an opening 40 for the passage of the saw blade 24 and behind it, in the opposite bearing surface 36, another opening 46 in the form of an oblong hole, directed transversely to the direction

  in advance for the passage of a tightening stud 42.

  The tightening pin 42 penetrates from below at

  through the opening 46 of the plate 38 with an ex-

  tieur not referenced in the internal threading of a nut 44 integral in rotation with the lower zone 12b of the housing 12. The tightening pin 24 integrally applies the plate 38 against the housing 12 by supporting itself by a support washer 54 in flange shape, at the edge of

  the opening 46 against the underside of the plate 38.

  An eccentric head 50 is supported by a support washer 54 by means of a bearing stud 47 which constitutes the pivot axis 48 against the tightening stud

  42. The pivoting eccentric head 50, which is directed transversely

  dirty to the direction of advance of the pivot axis 48,

  turns into a rod-shaped clamping lever 52.

  In the extension of the longitudinal axis of the lever

  rage 52, the eccentric head 50 has an eccentric cam

  51a, enlarged, at least in the direction of the longitudinal axis

  nal, but nothing at the front (figure 7).

  In the position of the clamping lever 52, as shown, parallel to the plate 38, with a handle 56 facing the rear zone 12d, the eccentric head 50 of the clamping lever 52 is in its locked position; in this position, the lever bears with its eccentric cam 51a against the support washer 54 itself coming against the underside of the opposing support surface 36 and thus it blocks the plate 38 relative to the surface support 34 of

housing 12.

  The clamping lever 52 is held locked in position

  tion by a force and form connection by the ribs of

fixing 58 of plate 38.

  The antagonistic bearing surface 36 of the plate 38 is raised in the form of a lug in its rear zone and carries projections 62, radially projecting, regular, in the form of a row of teeth as well as cavities 63 in the form

  tooth intervals (Figures 3, 4); a projection 62 appears

rait in the drawings.

  The projections 62 and cavities 63 are associated (in the manner of a row of teeth), opposing projections 62 'and opposing cavities 63' of the contour of the bearing surface 34 of the housing 12 serving by interlocking to be fixed by a connection by shape, the housing 12 in adjustable angular positions relative to the plate 38. The plate 38 can slide backwards relative to the housing 12 until the edge of the cavity 46 in the form of an oblong hole abuts against the clamping stud 42. In this position, the projections 62 and cavities 63 are out of engagement with the opposing projections 62 'and opposing cavities 63', which allows the plate 38 to pivot relative to the housing 12

  if the clamping lever 52 occupies its release position.

  The angular position chosen between the plate 38 and the housing 12 is blocked by again engaging the projections 62 and the cavities 63 with the opposing projections 62 'and

  the opposing cavities 63 '(Figures 3 and 4).

  Figure 2 shows on an enlarged scale a block diagram of another exemplary embodiment of the invention for the area of the plate 38 with a part of the housing 12 as well as the tightening device formed by the tightening pin 42, of the nut 54 and the clamping lever 52 with the eccentric head 50; the clamping lever 52 is shown in its released position tilted around the pivot axis 48, projecting from the plate 38 as shown in solid line; in this pivoted position, the lever allows

  to adjust the plate 38 with respect to the housing 12. The posi-

  tion shown in broken lines of the lever 52 is the po-

  clamping position, in which the lever is tilted

parallel to the plate 38.

  To modify the clamping pressure between the plate 38 and the housing 12, it is necessary to turn the lever 52 with the clamping pin 42 about its longitudinal axis

  in the direction of the clamping arrow 60; so the re-

  axial gliding of the clamping pin 42 makes it possible to adjust the eccentric head 50 relative to the clamping nut 44 and thus to modify the clamping force in the clamping position. When

  the clamping lever 52 is in the clamping position, the plate

  tine 38 is either tightened more strongly vis-à-vis the housing 12 or by turning the clamping lever 52 about its longitudinal axis in the direction opposite to the direction of the arrow 60 there is less tightening or in the position of

  loosening of the clamping lever 52, it is very easy to adjust

  lement. Figure 3 shows a cross section of the jigsaw 10 according to Figure 1 in the area of the clamping lever 52 tilted in its loosening position around the pivot axis 48, the handle 56 projecting downwards

of plate 38.

  Figure 4 shows the same cross section as

  Figure 3 in front view, however with the lever

  rage 52 tilted in the clamping position around the axis of pi-

  vote 48, parallel to plate 38 (towards the rear).

  Only the eccentric head 50 of the lever 52 appears.

  Figures 3 and 4 show that the surface

  complementary support 36 of the plate 38 comprises a ran-

  teeth formed by projections 62 distributed regularly and projecting radially as well as two cavities 63 in the form of tooth intervals, with which are associated several corresponding projections 62 ′ in the form of a row of teeth and corresponding cavities 63 'in the contour of the bearing surface 34 of the housing 12; by interpenetration by form, a blocking is achieved by a form connection of the housing 12 relative to the plate 38 in the different

angular adjustment positions.

  Figures 5 and 6 show the bottom view of

  plate 38 with the details mentioned above; appear

  particularly feels openings 40, 46 of the passage

  saw blade 24 or clamping pin 42.

  Figure 5 shows the lever for

  rage 52 protruding from the plate 38 (relative to the plane of the drawing) tilted around the pivot axis 48. FIG. 6 shows the clamping lever 52 tilted in its position

  clamping, parallel to the plate 38 around the axis of pi-

  vote 48 with its handle 56 turned towards the rear.

  FIG. 7 shows the detail of the clamping lever 52 and of the handle 56 as well as the eccentric head 50 on an enlarged scale; the external thread not referenced from

  tightening pin 42 and its plate part 43 appear

  smells clearly with a hole 42 for the passage of the stud

level 47.

  As a detail also appears one of the two eccentric clamping surfaces 51a of the eccentric head 50 which are substantially parallel to the axis of the clamping lever 52 and serve as eccentric cams as shown in broken lines, with a loosening surface

  eccentric 51b shown in broken lines, transverse

  dirty to the axis of the clamping lever 52 at the front face of the clamping lever 52. The eccentric head 53 is shown partially in section; the flat part 43 of the clamping lever 42 with the bore 41 receiving the stud

level 47 thus appears.

  In the position of the clamping lever 52 shown

  felt, parallel to the plate 38, a clamping surface ex-

  centered 51a of the eccentric head 50 in the form of a fork presses against the support washer 54 and thus pushes the opposing support surface 36 of the plate 38 against the support surface 34 of the housing 12 to tighten the plate 38

against the housing 12.

  In the position of the clamping lever 52 in

  protrusion at right angles to the plate 38, the surfaces of

  tightening 51b which lie radially more towards

  inside, rest with reduced force against the round

  support plate 54 so that the pressure between the opposing support surface 36 of the plate 38 and the support surface 34 of the housing 12 becomes so low that the plate 38

  can be easily adjusted with respect to the housing 12.

  Figure 8 shows the longitudinal section of the

  clamping lever 52 connected to the clamping pin 42, according to FIG. 7, parallel to the plate 38. This figure shows very particularly that the clamping lever 52 has the shape of a fork at the level of the eccentric head 50 and that this

  fork surrounds the end of the clamp pin on both sides

  rage 42 in the form of a flat part. The bearing stud 47 rea-

  read in the form of a rivet which defines the pivot axis 48, passes through the eccentric head 50 and the corresponding end

  of the tightening stud 42. The bearing stud 47 is mounted so-

  vertically in rotation with the fork-shaped end of the eccentric head 50 while the tightening pin 42

  can be easily swiveled relative to bearing stud 47.

Claims (6)

R E V E N D I C A T IONS   1) Hand-held machine tool (10) including jigsaw with   preferably a tight tool (24) which can be put in an inclined position relative to the work, comprising a housing (12) housing a motor (18) and a transmission (20) coupled to the motor and a handle (14 ) as well as a trigger (16) to connect or cut the motor (18), transforming the movement of the motor into a movement, in particular a reciprocating movement of the tool (24) and the housing (12) rests on a plate ( 38) which can be adjusted in particular angularly with respect to the housing (12) by means of a clamping means (42, 44, 50, 52, 54),   characterized by a clamping lever (52), in particular with an eccentric head   (50) which can be tilted out of the plane of the plate, in particular downwards and constitutes a clamping means for   tighten and to lock the plate (38) relative to the housing (12).   20) Machine tool according to claim 1, characterized in that   the clamping lever (52) can be positioned in a position   tightening tion parallel to the plate (38) and inside the contour of its lower face (39) and to be tilted from the   clamping position in a loosening position, in particular   ment projecting from the plate (38).   ) Machine tool according to any one of the claims   1 and 2, characterized in that the clamping lever (52) is pivotally coupled to   a clamping stud (42) via a pin axis   vote (48), this stud attaching to the housing (12) and crossing   sant an opening (46) of the plate (38).   ) Machine tool according to claim 3, characterized in that the opening (46) is an oblong hole directed transversely   relative to the direction of advance (30) of the machine (10).    ) Machine tool according to claim 4, characterized in that   the clamping lever (52) carries at its pivot axis   tement (48), an eccentric head (50), the eccentricity of which is relative to the pivot axis (48) and the surface of which   eccentric clamping (51a), raised, is directed transverse-   ment to the pivot axis (48) and relative to the axis of the   clamping sink (52) and whose loosening surface   eccentric (51b) is directed transversely to the pivot axis   tement (48), along the axis of the clamping lever (52).   6) Machine tool according to claim 5, characterized in that the eccentric head (50) is supported in particular by means of a support washer (54) relative to the underside (36a) of the plate (38), preferably the bearing surface domed antagonist (36).   7) Machine tool according to any one of claims   previous, characterized in that the clamping lever (52) protrudes from the lower end   of the plate (38) in the clamping position with its poi gnate (56).   8) Machine tool according to any one of claims   previous, characterized in that the clamping lever (52) is supported inside the contour of the plate (38), in particular by a connection by the force of   preferably by a form link in the service position rage.   9) Machine tool according to any one of claims   previous, characterized in that the opposing bearing surface (36) of the plate (38) carries   projections (62) or cavities (63), radial, spaced apart   generally in the form of a row of teeth, and with which are associated at least one and preferably several projections (62 ') and corresponding cavities (63'), distributed   in the form of a row of teeth and cavities for penetration   trer in the contour of the bearing surface (34) of the housing (12).    ) Machine tool according to any one of the claims   previous, characterized in that the eccentric head (50) of the clamping lever (52) surrounds the clamping pin (42) like a fork and pivots   integrally in rotation with a bearing stud (47),   pouring the tightening pin (42) and defining the axis of pi-   vote (48), relative to the tightening stud (42).