FR2850048A1 - Cramp iron plate for fixing of machining piece e.g. sheet metal, has screw driving nail against machining piece to pierce nail into piece and, screw-nut to maintain nail to be driven into interior of machining piece - Google Patents

Abstract

The plate has a body (11) fixed on a support unit such as a table, (3) and pressed against a machining piece (1) such as a sheet metal. A screw (31) drives a nail (5) against the machining piece in a manner to pierce the nail, formed on a rod, into the piece. A screw-nut maintains the nail to be driven into the interior of the machining piece. An Independent claim is also included for a process for fixing a piece to manufacture on a support unit.

Description

The present invention relates to a cleat clamp and a method of

  attachment of a workpiece to support means with tacking studs.

  As is known to a person skilled in the art, the tacking studs are members making it possible to fix a workpiece to support means such as a table or a pallet.

  Each clamping stud is adapted to be fixed on the support means and to come into abutment against the workpiece, thereby ensuring the latter is blocked.

  The tack clamps of the prior art have this in common that they do not allow the workpiece to be blocked on the support means with optimum stability and security.

  The object of the present invention is in particular to resolve this drawback.

  This object of the invention is achieved with a type 15 clamping clamp comprising a body intended to be fixed on the support means and to come into abutment against a workpiece, remarkable in that it comprises at least one point, means for striking said point against said part so as to make this point penetrate into this part, and means for keeping said point pressed inside said part.

  Thanks to these characteristics, the point can penetrate and remain pressed inside the part to be machined, thus ensuring the blocking of this part with extreme stability on the support means.

  According to other characteristics of the present invention: said tip is formed on a rod mounted to slide inside said body, and said striking means comprise a screw independent of said rod, disposed in the axial extension of this rod, also slidingly mounted inside said body, and the head of which protrudes from said body opposite said rod; - Said holding means comprise a nut cooperating with a threaded part of said screw, said nut being mounted free in translation in the axial direction of said screw and fixed in rotation inside a housing formed in said body; the axial direction of said rod forms a slight angle with respect to the face of said body which is intended to rest on said support means, so that said point exerts a force tending to keep said piece pressed against said support means; - said angle is of the order of one degree and thirty minutes; - Said body comprises a main part intended to come into abutment against said workpiece, and a secondary part intended to be fixed on said support means, and means for adjusting the position of said main part relative to said secondary part; - Said adjustment means comprise complementary racks integral with said main and secondary parts, and means for clamping said main part against said secondary part in each of the relative positions of these parts defined by said racks; - Said clamping means comprise an oblong hole formed in said main part, a substantially circular hole formed in said secondary part, and a screw passing through said holes and intended to come into engagement with said support means; - Said tip has at least three faces; 15 - said point is made of specially treated steel; - the tackle clamp comprises two points; - Said body has, in a region intended to bear against said part, non-slip means; - said non-slip means comprise ridges formed in said region.

  The present invention also relates to a method of fixing a workpiece to support means, remarkable in that it comprises the steps consisting in: a) fixing a clamp of the fixed type on said support means, b ) place said part on said support means, so that a first zone of this part comes to bear against said fixed type crampon, c) fix a mobile type crampon on said support means, in the vicinity of a second zone of said part situated opposite 30 of said first zone, d) adjusting the position of the main part of said movable type crampon with respect to its secondary part so that said main part comes to bear practically against said second zone of said part, e) tighten said main part against said secondary part, i) strike the tip (s) of said movable type tackle crampon against said part so as to penetrate this (o u these) point (s) in this part, g) blocking the point (s) of said movable type tackle crampon against said part, h) striking the point (s) of said type tackle crampon fixed against said piece so as to make this (or these) tip (s) penetrate into this piece, and i) block the (or) tip (s) of said fixed-type clamp 10 against said piece.

  According to other characteristics of this process - said support means can be vertical or horizontal; - At least two clamps are fixed to one another so as to immobilize a workpiece of great thickness on said support means.

  Other characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing in which: - Figure 1 shows a workpiece fixed to a table by a plurality of tacking studs in accordance with the present invention: - Figure 2 is a top view of one of the tacking studs of Figure 1 cooperating with the workpiece; Figure 3 is a detailed top view of a fixed type clamping clamp according to the present invention, the means for locking the workpiece not having been shown; - Figure 4 is a sectional view of the tacking clamp of Figure 3, along the section plane 111-111 of this figure, the workpiece as well as machining means having also been shown; - Figure 5 is a sectional view of the clamping clamp of Figure 3, according to the cutting plane V-V of this figure, the locking means of the workpiece, as well as the workpiece having been shown. In this FIG. 5, the blocking means are shown before blocking the workpiece; - Figure 6 is similar to Figure 5, and the locking means are shown in the locking position of the workpiece; - Figure 7 is a bottom perspective view of a movable type crampon according to the invention; - Figures 8 and 9 are views similar to Figures 3 and 4 of this movable tacking clamp.

  Reference is now made to FIG. 1 in which a workpiece such as a sheet 1 has been shown, placed on support means such as a table 3.

  A plurality of tacking studs CF1 to CF3 and CM1 to CM3 according to the invention make it possible to fix the sheet 1 on the table 3 for its machining by suitable means (milling machine, drill, sander, etc.).

  As will be explained in what follows, the tacking studs according to the invention are of two types: fixed (CF1 to CF3) or mobile (CM1 to CM3).

  Reference is now made to FIG. 2 in which it can be seen that the tacking studs CF and CM comprise points 5a, 5b which partially sink into the edges 9 of the sheet 1.

  For more details on the CF fixed crampons, reference is now made to FIGS. 3 to 6.

  As can be seen in FIG. 3, the clamping cleat CF comprises a body 11 produced for example by machining or machined molding of a metal alloy, this body being substantially symmetrical with respect to a plane P. The body 11 is crossed by a bore 13 whose axis is contained in the plane P. Housings 15a, 15b are formed in the body 11 symmetrically with respect to the plane P. Bores 17a and 19a, whose axes are coincident and parallel to the plane P, open into the housing 15a on the one hand and outside the body 11 on the other hand.

  Similar bores 17b, 19b are arranged symmetrically with respect to the plane P. In the region 21 intended to come into abutment against the workpiece, the body 11 has a projection provided with a non-slip surface formed for example by streaks 23.

  Referring to FIG. 4, it can be seen that in operational situation the body 11 30 of the fixed tackle clamp CF is held on the table 3 by means of a threaded screw and that the ridges 23 are effectively in abutment against the part 1 intended to be machined by a tool 27.

  We now refer to FIG. 5, on which we see the means making it possible to block the workpiece 1.

  For the sake of brevity, we will now describe only the blocking means arranged in the bores 17a and 19a of the body 11 of the fixed tackle clamp CF, it being understood that the blocking means arranged in the bores 17b and 19b of this body are identical.

  As can be seen in FIGS. 5 and 6, the means for blocking the workpiece 1 comprise a rod 29 slidingly mounted inside the body 11 and ending in a point 5.

  This rod is preferably formed from specially treated steel, and the tip 5 preferably has three faces.

  The locking means of the part 1 also include a screw 31 independent of the rod 29.

  The screw 31 is arranged in the bore 17a (see FIG. 3) in the axial extension of the rod 29.

  The screw 31 is slidably mounted inside the bore 17a, and it comprises a thread 33 engaged with a nut 35 disposed inside the housing 15a.

  The geometry of the nut 35 is such that it can freely slide inside the housing 15a in the axial direction of the screw 31, while being locked in rotation inside this housing.

  Preferably, a pin 37 prevents the screw 31 from coming out of the nut 35.

  It should be understood at this stage that the screw 31 and the rod 29 are completely independent of one another and that by pushing axially on the screw 31, an axial displacement of the rod 29 is caused.

  It can be seen in FIG. 6 that in the locking position the rod 29 has been moved in the direction of the workpiece 1, so that the tip 5 of this rod partially penetrates into the edge 9 of this part 1.

  It will be noted, in particular in FIG. 5, that the common axis of the screw 31 and the rod 29 preferably form a slight angle ct with respect to the face 37 of the body 11 which is intended to rest on the table 3. 30 This slight angle a is preferably 1 30 '.

  Referring now to Figures 7 to 9 in which there is shown a movable type crampon CM according to the invention.

  For the parts of this movable spike CM identical or similar to the parts of the fixed spike CF described above, the same references will be used.

  On the other hand, still for the sake of brevity, we will only describe the parts of this movable tackle spike which differ from the pieces of the fixed tackle spike.

  As can be seen in particular in FIG. 7, the movable clamping clamp 5 CM in fact comprises a main part 11 intended to come to bear against the workpiece and a secondary part 39 intended to be fixed on the table 3.

  It can be seen in FIGS. 7 and 9 that the main 11 and secondary 39 parts include complementary racks 41, 43.

  It can also be seen in FIGS. 7 to 9 that the main part 11 is crossed 10 in the region of its rack 41 by an oblong hole 45.

  It can also be seen that the secondary part 39 is traversed in the region of its rack 43 by a substantially circular hole 47 whose diameter is substantially equal to the width of the oblong hole 45.

  The method of use and the advantages of the tacking studs which have just been described result directly from the above.

  Referring to Figure 1, when we want to fix the part on the table 3, we start by fixing the three fixed clamps CF1 to CF3 on this table using screws 25 (see Figure 4).

  The piece 1 is then placed on the table 3 so that it comes to bear against the three fixed studs CF1 to CF3.

  The three movable spikes CM1 to CM3 are then fixed by means of the screws 25, without however tightening these screws 25.

  The position of the main parts 11 of the movable spikes CM1 to CM3 is then adjusted so that the ridges 23 (see FIGS. 7 to 9) come to bear practically against the edges of the part 1 opposite those which cooperate with the fixed spikes CF1 at CF3.

  Once this adjustment has been made, the main parts 11 of the mobile spikes CM1 to CM3 are tightened against the secondary parts 39 of these spikes by means of the screws 25.

  In doing so, the racks 41 and 43 (see FIG. 9) of these mobile spikes overlap one another, thus ensuring the blocking of the main parts 11 of these mobile spikes.

  Using a suitable tool, the heads 31 of the screws 31 are then struck from the movable spikes CM1 to CM3.

  In doing so, and thanks to the fact that the nuts 35 (see FIGS. 5 and 6) can slide inside the housings 15 of the bodies 11, the screws 31 in turn strike against the rods 29, thus causing the penetration of the spikes 5 in the edges of part 1.

  Once this penetration is obtained, the screws 31 are rotated by means of an appropriate tool (electric screwdriver or other), which has the effect, since the nuts 35 are fixed in rotation, to bring the screws in a position (see Figure 6) where they keep the rods 29 pressed against the part 1.

  We then strike and screw in a similar manner the screws 31 of the 10 fixed studs CF1 to CF3.

  The workpiece is thus immobilized perfectly in relation to the table 3, which then makes it possible to machine the work 1 safely and with great precision by means of suitable machining tools 27 (see FIG. 4) .

  It will be noted that the inclination of the axes of the screws 31 and of the rods 29 relative to the internal faces 37 of the tacking studs (see FIGS. 5 and 6) makes it possible to optimize the restoring force of the part 1 on the table 3 exerted by points 5.

  It will be noted that the fixing of the tacking studs of the invention to the support means 3 is extremely easy and rapid, as is the blocking of the part 1 by means of these tacking studs.

  It will also be noted that the tacking studs according to the invention may have a low height, in particular less than the thickness of the workpiece, which makes it possible to easily machine this part in particular in the vicinity of its edges, in particular in the in the case of a sanding operation ...

  It appears from the foregoing description that the invention does indeed make it possible to resolve the aim sought which is to fix very stably and securely a workpiece on support means which may be horizontal or vertical.

  Of course, the present invention is not limited to the embodiment described and shown provided by way of illustrative and nonlimiting example.

  Thus, for example, one could consider tacking studs 30 in accordance with the above teaching, but each comprising only one or more than two points.

  It is also thus that one could envisage fixing at least two tacking studs one on the other so as to immobilize a workpiece of great thickness on the table 3.

  To do this, one could use a single screw 25 of greater length, suitable for passing through the two tacking studs at the same time and for engaging with the table 3.

Claims (16)

  1. Plating clamp (CF1 to CF3, CM1 to CM3) of the type comprising a body (11) intended to be fixed on support means (3) and to come into abutment against a workpiece (1), characterized in that that it comprises at least one point (5a, 5 5b), means (31) for striking said point (5a, 5b) against said part (1) so as to make this point (5a, 5b) penetrate into this part (1), and means (31, 35) for holding said point (5a, 5b) pressed inside said part (1).   2. tackle clamp according to claim 1 (CF1 to CF3, CM1 to CM3), characterized in that said tip (5a, 5b) is formed on a rod (29) slidably mounted inside said body (11), and in that said striking means comprise a screw (31) independent of said rod (29), arranged in the axial extension of this rod (29), also slidingly mounted inside said body (11), and the head protrudes from said body (11) opposite 15 from said rod (29).   3. Clamp clamp (CF1 to CF3, CM1 to CM3) according to claim 2, characterized in that said holding means comprise a nut (35) cooperating with a threaded part of said screw (31), said nut (35) being mounted free in translation in the axial direction of said screw (31) and fixed in rotation inside a housing (15a, 15b) formed in said body (11).   4. Clamp clamp (OF1 to CF3, CM1 to CM3) according to one of claims 2 or 3, characterized in that the axial direction of said rod (29) forms a slight angle (a) relative to the face (37 ) of said body (11) which is intended to rest on said support means (3), so that said point (29) exerts a force tending to keep said piece (1) supported on said support means (3).   5. tackle clamp (CF1 to CF3, CM1 to CM3) according to claim 4, characterized in that said angle (a) is of the order of one degree and thirty minutes.   6. tackle clamp (CM1 to CM3) according to any one of the preceding claims, characterized in that said body comprises a main part (11) intended to come into abutment against said workpiece (1), and a secondary part (39) intended to be fixed on said support means (3), and means (25, 41, 43, 45, 47) for adjusting the position of said main part (11) relative to said secondary part (39) .   7. Clamp clamp (CM1 to CM3) according to claim 6, characterized in that said adjustment means comprise complementary racks (41, 43) integral with said main (11) and secondary (39) parts, and means (25, 45, 47) for clamping said main part (11) against said secondary part (39) in each of the relative positions of these parts defined by said racks (41, 43).   8. Clamp clamp (CM1 to CM3) according to claim 7, characterized in that said clamping means comprise an oblong hole (45) formed in said main part (11), a substantially circular hole (47) formed in said part secondary (39), and a screw (25) passing through said holes (45, 47) and intended to come into engagement with said support means (3).   9. tackle clamp (CF1 to CF3, CM1 to CM3) according to any one of the preceding claims, characterized in that said tip (5a, 5b) has at least three faces.   10. Claw clamp (CF1 to CF3, CM1 to CM3) according to any one of the preceding claims, characterized in that said point (5a, 5b) is of specially treated steel.   11. tackle clamp (CF1 to CF3, CM1 to CM3) according to any one of the preceding claims, characterized in that it comprises two points (5a, 20 5b).   12. tackle clamp (CF1 to CF3, CM1 to CM3) according to any one of the preceding claims, characterized in that said body (11) has, in a region (21) intended to bear against said part (1) , non-slip means (23).   13. tackle clamp (CF1 to CF3, CM1 to CM3) according to claim 12, characterized in that said non-slip means comprise ridges (23) formed in said region.   14. Method for fixing a workpiece (1) on support means (3) with at least one first clamping clamp (CF1 to CF3) according to any one of claims 1 to 13, and at least a second tacking stud (CM1 to CM3) according to any one of claims 7 to 13, characterized in that it comprises the steps consisting in: a) fixing said first stud (CF1 to CF3) on said support means ( 3), 1 1 b) place said part (1) on said support means (3), so that a first zone of this part comes to bear against said first crampon (CF1 to CF3), c) fix said second clamp (CM1 to CM3) on said support means (3), in the vicinity of a second zone of said part (1) located opposite to said first zone, d) adjusting the position of the main part (11 ) of said second stud (CM1 to CM3) relative to its secondary part (39) so that said main part (11) comes practi only in abutment against said second zone of said part (1), e) tighten said main part (11) against said secondary part (39), f) strike the tip (s) (Sa, 5b) of said second clamping stud (CM1 to CM3) against said piece (1) so as to make this (or these) tip (s) (Sa, 5b) penetrate into this piece (1), g) block the tip (s) (s) (5a, 5b) of said second tacking stud (CM1 to CM3) against said piece (1), h) striking the tip (s) (5a, 5b) of said first tacking stud (CF1 to CF3) against said part (1) so as to cause this (or these) point (s) (5a, 5b) to penetrate into this part (1), and to i) block the point (s) (5a, 5b) of said first tacking clamp (CF1 to CF3) against said part (1). 15. The method of claim 14, wherein said support means (3) are vertical or horizontal.   16. Method according to one of claims 14 or 15, in which at least two clamps are fixed (CF1 to CF3 and CM1 to CM3) one on the other so as to immobilize a workpiece (1) of very thick on said support means (3).