FR2777488A1 - VIBRATING SANDER - Google Patents

Abstract

Sander comprising a device for clamping the sanding sheet (3) against the plate (1) of the orbital sander. A clamping screw (15, 21) is mounted on the plate (1) movable between two stops (17, 18); this screw comprises a part (23) outside the plate (1) which acts on a pressure part (25). The part (25) which pivots practically square with respect to the plate (1) allows the clamping screw (15, 21) to clamp the sanding bearing sheet (3) against the plate (1). The device is easy to use and is robust.

Description

State of the art: The present invention relates to a screw sander

  hand flange comprising a sanding plate driven by a motor and receiving a sanding sheet sanded against the5 sanding plate by a clamping device carried by the plate, the clamping device having a pressure piece, one end of which is joined in particular by a hinge-type connection to the upper side of the workpiece sanding plate by which the sanding sheet is clamped

  against the upper side of the sanding pad.

  According to document US-3,375,616, a vibrating sander with a motor is known, comprising a fixing device.

  tion of the sheet of paper to clamp the sheet; in this case, to loosen the sheet, a worm-rusting member provided with a spring is moved using a slide in posi-

  lifting position with respect to the opposing surface; and to tighten the sheet, the locking member is moved to the support position relative to the opposing surface. This

  fixing device consists of several parts

  which must be adapted to each other. he

  in addition, a relatively large actuating force is required.

  aunt acting parallel to the sanding plate and a

  relatively complicated succession of movements for action-

  ner the pusher, which complicates the operation of the device

  fixing the bearing sheet.

  In addition, according to document EP-0558 503, it is known

  a device is born to clamp sandpaper on a

  vibrating sander. In this device, a trigger mechanism

  clearly bistable constitute the clamping member; this mechanic

  nism is easy to maneuver, but it consists of a

  leaf spring complicated to produce; in a first posi-

  tilting spring, this spring pushes the end of the

  sheet of paper against the sanding plate and in its se-

  in tilting position, it releases the end of the

sheet of paper.

  Advantages of the invention The present invention aims to remedy these drawbacks and proposes to create a device of a simpler embodiment and operation than the

means of the state of the art.

  To this end, the invention relates to a device of the type defined above, characterized in that the clamping device comprises a clamping screw mounted on the side

  upper side of the sanding plate, being able to screw into this

  the clamping screw being engaged with its part

  above the sanding plate with the pressure piece so that by turning the clamping screw, this piece can tilt

in relation to the sanding pad.

  The device according to the invention offers the advantage

  to develop a constant level pressure on the

  mites of the sheet of paper; the sheet of paper is changed by a simple, easy rotation from a clamping screw to

hand, turned from a low angle.

  Advantageously, the clamping screw includes, outside the base body of the sanding plate, a handle which acts on a pressure piece. The pressure piece is connected by a clamping clamp directed towards the middle of the base body against the base plate; the clamping bracket surrounds the clamping screw between the base plate

  and the handle with an oblong hole. The handle can be

  read in the form of a rotary button, a joystick or

  a wing nut; the button can advantageously be mutually

  nor of a fin-shaped extension constituting a poi-

  or a positioning mark. To better distribute the pressure, a washer can be provided between the handle and the clamping bracket; the handle may itself have a

  heel in the vicinity of the clamp.

  The stops can be located inside and / or

  outside the base body. It is advantageous that the bu-

  tees are in the form of washers and that they are provided

  at the end of the clamping screw, following each other in the di-

  longitudinal section, being separated from each other by

  the threaded part of the clamping screw which is at the

  basic body calf. A thrust washer is thus located at the end opposite to the handle on the clamping screw at the level of the base body, preventing the screw from detaching from the base body. The other thrust washer is located outside of the base body and rests against

  the clamp when turning the screw appropriately

  required, to put the pressure piece in the released position

  ration. To guarantee the maintenance of the sanding paper for the same clamping pressure, the side of the pressure piece facing the path is provided with a coating or a lining promoting friction. The length of the pressure piece corresponds mainly to the width of the

basic body.

  It is advantageous to have to turn more than the clamping screw in its position between the clamping and the loosening of the sandpaper. To simplify the mounting of the device according to the invention, the base body is made in two parts (two halves) and it is hollow at least at the level of the clamping screw, the plane of separation of the two parts passing through the axis rotation of the clamping screw; it is directed mainly at right angles to the body

  basic. The basic body is advantageously made of ma-

plastic.

  Drawings: The present invention will be described below from

  in more detail using two examples of realizations

  tion schematically shown in the accompanying drawings, in which:

  * Figure 1 is a longitudinal section of a first example

  ple of a sanding paper clamping device according to the invention, at the left end of a sander plate, * Figure 2 is a longitudinal section of a second example

  of a device for clamping the sandpaper

  cer, according to the invention at the right end of a sander plate,

  * Figure 3 is a top view of the device of the

gure 1,

  * Figure 4 is a top view of the device of the

gure 2.

  Description of the exemplary embodiments:

  The left end area of a platform

  ceuse 1, shown in longitudinal section in FIG. 1, as a separate part without the other parts of the sander, shows that the lower side 2 is provided with a sanding sheet 3, flexible, essentially rectangular; this sheet surrounds the left outer end 4 of the sanding plate 1, at the edge 6 and a sharp edge rim 8; the end 10 of the sheet is parallel to the initial direction on the upper side 12 of the plate 1. The right end, not shown of the sanding plate 1 corresponds to

  a symmetrical realization of the left end and correspond-

  lays in principle at the right end of the sanding pad

1 'according to Figure 2.

  The sanding plate 1 constituting the tool support is hollow; it is made of plastic and the motor of the sander drives it in a circular motion without rotation to sand parts. The plate 1 is formed by two essentially identical parts 101, 102 (FIG. 3) joined along a plane E-E passing through the middle of the figure

3 and parallel to the drawing plane.

  In the vicinity of the left end 4 of the plate 1, at the upper side 12, there is a screw bearing 13

  with an internal thread to receive the external thread

  laughter of the threaded part 15 of the body 21. The body 21 carries

  two thrust washers 17, 18 axially distant and delimited

  mitting the threaded part 15; these washers are integral in rotation and not sliding; the thrust washer 18 is provided at the lower end of the threaded part 15 and at the upper end of the body 21 carries a rotary button

  23 serving as a handle. The body 21 forms with the file part

  tee 15 and button 23, a hand tightening screw

rotation X-X or Y-Y.

  The rotary button 23 is supported by its lower side.

  laughter 24 on the upper side of a pressure piece 25

  of an elastic clamping bracket 26, with pivoting arm.

  The clamping bracket 26 is fixed by injection or glued by its right side in the direction of observation against the upper face of the plate 1; by its left free end in the direction of view, this stirrup pivots elastically

  with respect to the upper face of the base plate 1.

  The clamping bracket 26 surrounds the body 21 radially and without contact with its opening 31 preferably oval or in the form of an oblong hole. When the stirrup 36 is tilted by

  rotation and axial displacement of the body 21 around the axis X-

  X, body 21 and stirrup 26 cannot get caught or

  accidentally tighten against each other. The ron-

  delle of abutment 17 drives the stirrup 26 during tilting in

  uprising; the lower side 24 of the rotary knob 23 as-

  on the drive for downward tilting; the ron-

  of which 17, 18 can be made in one

part with body 21.

  The pressure piece 25 of the clamping bracket 26 has on its lower face, an elastic insert 41, which projects; this insert is for example made of foam rubber and rests in the position shown, on the part 10 of the sheet of sanding paper 3 and presses this part against the upper face 12 of the plate 1. Due to the pressure and the

  high friction between the pressure piece 25 and the

  tie 10 of the sanding sheet 3 as well as between the part 10 of the sanding sheet 3 and the upper side 12 of the plate

  1, the sheet of sanding paper 3 is blocked in the posi-

  tion shown in Figures 1 and 2. Under these conditions, the

  lower side of clamping yoke 26 is at a

  ble axial distance from the thrust washer 17 which is located

  at a small axial distance from the edge of the internal thread 13 to

  develop the strongest clamping force on the sheet

sanding stone 3.

  To facilitate adjustment of the service position

  rage and loosening of the button 23, there is a mark 28 on the clamping bracket 26 associated with the radial cam or the fin 27 in the clamping position according to FIG. 1, and

  the fin 27 must be pivoted to this mark for the po-

  tightening position or be removed from this mark for the posi-

  loosening: to release or replace a sheet of

  sandpaper 3, turn button 23 to the left

  lon the directional arrow 29, at an angle of 180 until the fin 27 reaches another mark 30 on the clamping bracket 26. In this position, the thrust washer 18 is supported from below or at from the cavity against the upper side 12 of the plate and does not allow the clamping screw 15, 21 to be turned further. At the same time, the thrust washer 17 has sufficiently released the clamping bracket 26 and its pressure piece 25 in relation to the sheet of sanding paper 3, pressing axially from below against

the clamping bracket.

  The other clamping screw for tightening as well

  on both sides the sheet 3 against the tray 1 is not

  presented; it is planned symmetrically to

  the opposite end of the plate 1; depending on the space available

  ble for the movement of the fins 27, it may have a

  opposite to that of the first clamping screw 15, 21, 23 to allow the two clamping screws to be actuated simultaneously with both hands, following an opposite rotation movement, advantageous from an ergonomic point of view; we can thus detach simultaneously, very quickly the sheet of paper

  sand 3 at both ends 10, 11.

  The longitudinal section view of FIG. 2 shows

  be as a separate part without the other parts of the pin-

  ceuse, the right end area of the sanding pad 1 '; this corresponds in principle to the embodiment of Figure 1; on its underside 2 ', we installed a

  sheet of sandpaper 3 ', flexible, generally rectangular

  laire, which passes on the right outer end 5 of the plate

  sheet 1 'by surrounding an edge 7 to pass around the sharp edge rib 9 and come with the end against the

  upper side 12 'of the tray 1', in a parallel direction

relates to the original management.

  The sanding plate 1 'which constitutes the holder

  tool, is hollow; it is made of plastic and the motor of the sander drives it in circulation but without rotation to sand the parts. The plate 1 ′ is produced in two parts 101 ′, 102 ′ which are generally identical (FIG. 4) which meet along a central plane E-E according to FIG. 3, and

  which is parallel to the plane of the drawing in FIG. 2. In the vicinity

  swim from the end 5, the upper side 12 ′ has a side

  link thread 14 with an internal thread to receive the threaded part 16 with external thread and the ends of the body 22 of which include thrust washers 19, 20; the body 22 forms with the threaded part 16, a clamping screw with an axis of rotation X-X or Y-Y. The thrust washers 19, 20 are essentially perpendicular to the axis of rotation X-X

or Y-Y.

  Unlike the example of realization of the

  Figure 1, the clamping bracket 32 is fixed by screwing or

  be at its side opposite the end 5 on the plate

  sanding plate 1 '. The free end of the clamping bracket 32 which is in the vicinity of the end 5, comprises a pressure piece 33 whose surface 34 facing the sheet of sandpaper 3 has a structure in the form of a friction coating. The end of the body 22 opposite the

  sanding plate 1 carries a lever 30 integral in rotation

  tion which can pivot between the "open" and

  "closed" designated by references 35, 36 in the directions

  indicated by the double arrow 37.

  In the position shown, the clamping screw formed by the threaded part 16 and the body 22 is adjusted or screwed in the raised position, so that the thrust washer

  20 press against the upper side 12 of the plate 1 'and inter-

  thus says that the body 22 cannot be unscrewed. The thrust washer 19 lifts the clamping bracket 32 and the pressure piece 33 relative to the folded part 11 of the sheet of sandpaper 3 '. The sheet 3 'can thus be removed and replaced. The body 22 passes through an opening 38 of

  the clamping bracket 32 which is sufficient and of light form-

  oval so that the clamping screw 16, 22 is not obstructed

  born in its movement of rotation by the movement of

  tilting of the clamping bracket 32 and vice versa.

  To tighten the sheet of sandpaper 3 times

  tre the tray 1, the lever 40 is tilted in the direction designated by the double arrow 37 towards the mark 26. The clamping screw 16, 22 is then screwed into the tray 1 until

  that the thrust washer 19 is pressed against the upper side

  laughing 12 of the sanding pad 1. At the same time, the lever presses with its lower surface 39 against the stirrup

  clamping 32 to clamp the pressure piece 33 against the

  tie 11 of the sheet of sanding paper by tightening it

against the plate 1.

  It is clear that each plate 1, 1 ′ preferably comprises two identical devices such as those of FIGS. 1 and 2, provided near the ends 4, 5 of the plate 1, 1 ′. The clamping screws on each end may have a thread in opposite directions, depending on the space available for

movement of the levers 40.

  For mounting the device according to the invention and in particular that of the thrust washers 18, 20 equipping the

  sanding plate 1, 1 ', it is important to divide the plate

  sanding plate 1, 1 'in plane E-E.

  According to an embodiment not shown, of the invention, the sanding plate is in one piece, not hollow but in solid material and outside on the sanding plate, in place of the thrust washers, there is stops that prevent the clamping screws from coming off

threads 13, 14.

  According to another exemplary embodiment not shown

  felt from the sanding pad, the clamping screws have a thread-

  tage reaching the handle, which is advantageous in terms of manufacturing and the area of the thread which is

  above the upper stop is not used.

  According to another exemplary embodiment of the invention

  tion, not shown, the clamping brackets extend at their fixing side, not over the entire width of the sanding plate. The stirrups can be V-shaped or U-shaped, preferably being fixed by the top of the V-shaped or the ends of the U-shaped arms on the tray

sanding.

  Instead of the rotary knob or the joystick, you can also use a wing nut. The different

  characteristics of the exemplary embodiments described below

  can be exchanged or combined with multiple ma-

  niers in the context of the present invention.

Claims (8)

R E V E N D I C A T I ON S   1) Hand vibrating sander with a sanding plate   (1, 1 ') driven by a motor and receiving a sanding sheet   cer (3, 3 ') sanded against the sanding plate (1, 1') by a clamping device (15, 21; 16, 22) carried by the plate, the clamping device having a pressure piece   (25, 33) one end of which is integrally connected, in particular   by a hinge-type connection to the upper side of the sanding plate (1, 1 '), piece by which the sanding sheet (3, 3') is pressed against the upper side of the sanding plate (1, 1 ') , characterized in that * the clamping device comprises a clamping screw (15,   21, 16, 22) mounted on the upper side of the platform   hole (1, 1 ') being able to be screwed into it, * the clamping screw (15, 21; 16, 22) being engaged with its part above the sanding plate (1, 1') with the pressure piece (25, 33) so that by turning the clamping screw (15, 21; 16, 22), this piece can tilt by   compared to the sanding plate (1, 1 ').   2) Orbital sander according to claim 1, characterized in that the clamping screw (15, 21; 16, 22) is adjustable in a limited manner in a threaded bearing (13, 14) preferably by two axial stops (17, 18 ; 19, 20) and it holds the pressure piece (25, 33) between its button-shaped handle   turning (23) or lever (40) as screw head and the round delle of abutment (17, 19).   3) Orbital sander according to claim 1, characterized in that   the pressure piece (25, 33) is part of a clamp   rage (26, 32), the latter being articulated on the plate of sanding (1, 1 ').   4) orbital sander according to claim 3, characterized in that the pressure piece (25, 33) has an opening (31, 38) through which the body (15, 16) of the clamping screw (15, 21; 16, 22), the diameter of the handle (23, 40) and that of the thrust washers (17, 19) being greater than the diameter of the opening (31, 38). ) Orbital sander according to claim 4, characterized in that the handle (23, 40) is in the form of a rotary button with at   minus a fin-shaped extension (27).    ) Orbital sander according to any one of the claims   1 to 5, characterized in that the clamping screw (15, 21; 16, 22) carries two thrust washers (17, 18; 19, 20) between which there is a threaded part (15, 16) engaged of screwing with the threaded bearing   (13, 14) of the sanding plate (1, 1 ').   7) A vibrating sander according to claim 1, characterized in that the surface (34) of the pressure piece (25) facing the   upper side of the sanding plate (1) has a coating friction (41).   8) Orbital sander according to claim 1, characterized in that the clamping screw (15, 21; 16, 22) pivots between two marks (28, 30; 35, 36) characterizing the end positions on the upper side , the pivoting being preferably over 1800.   9) orbital sander according to claim 1, characterized in that the sanding plate (1, 1 ') at least partially hollow is   formed of two notably symmetrical parts, which meet   feels along a median, longitudinal junction plane (EE), perpendicular to the sheet of sanding paper (3, 3 '), the axes of rotation (XX and YY) of the clamping screws (15, 21; 16, 22) being in the junction plane (EE) and parallel   to the longitudinal direction of the sanding plate (1, 1 ').   10) Orbital sander according to claim 1, $ characterized in that   the length of the compression piece (25, 33) is essentially equal to the width of the sanding plate (1, 1 ').