EP1442833A1 - Clamping crampon and method for clamping a workpiece with such clamping crampons - 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 fixing a workpiece to support means with crampons tacklers.

As is known to a person skilled in the art, tackle studs are members for fixing a workpiece to support means such than a table or a pallet.

Each tacking clamp is adapted to be fixed on the means of support and to come into abutment against the workpiece, thus ensuring the blocking of the latter.

Prior art tackers have this in common that they do not allow the workpiece to be blocked on the support means with optimal 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 tacking crampon of the type comprising a body intended to be fixed on the support means and to come in support against a workpiece, remarkable in that it comprises at least one tip, means for striking said tip against said piece so as to make penetrate this point into this part, and means for maintaining said point pressed inside said part.

Thanks to these characteristics, the point can penetrate and remain pressed in the interior of the workpiece, thus ensuring that this workpiece is blocked with a extreme stability on the support means.

• ladite pointe est formée sur une tige montée coulissante à l'intérieur dudit corps, et lesdits moyens de frappe comprennent une vis indépendante de ladite tige, disposée dans le prolongement axial de cette tige, également montée coulissante à l'intérieur dudit corps, et dont la tête dépasse dudit corps à l'opposé de ladite tige ;
• lesdits moyens de maintien comprennent un écrou coopérant avec une partie filetée de ladite vis, ledit écrou étant monté libre en translation selon la direction axiale de ladite vis et fixe en rotation à l'intérieur d'un logement formé dans ledit corps ;
• la direction axiale de ladite tige forme un léger angle par rapport à la face dudit corps qui est destinée à reposer sur lesdits moyens support, de manière que ladite pointe exerce un effort tendant à maintenir ladite pièce appuyée sur lesdits moyens de support ;
• ledit angle est de l'ordre d'un degré et trente minutes ;
• ledit corps comprend une partie principale destinée à venir en appui contre ladite pièce à usiner, et une partie secondaire destinée à être fixée sur lesdits moyens de support, et des moyens pour régler la position de ladite partie principale par rapport à ladite partie secondaire ;
• lesdits moyens de réglage comprennent des crémaillères complémentaires solidaires desdites parties principale et secondaire, et des moyens pour serrer ladite partie principale contre ladite partie secondaire dans chacune des positions relatives de ces parties définies par lesdites crémaillères ;
• lesdits moyens de serrage comprennent un trou oblong formé dans ladite partie principale, un trou sensiblement circulaire formé dans ladite partie secondaire, et une vis traversant lesdits trous et destinée à venir en prise avec lesdits moyens de support ;
• ladite pointe présente au moins trois faces ;
• ladite pointe est en acier spécialement traité ;
• le crampon plaqueur comprend deux pointes ;
• ledit corps présente, dans une région destinée à venir en appui contre ladite pièce, des moyens antidérapants ;
• lesdits moyens antidérapants comprennent des stries formées dans ladite région.

According to other characteristics of the present invention:

• said point 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 mounted to slide inside said body, and of which the head protrudes from said body opposite said rod;
• said retaining 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 supported on 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 comprises 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;
• said point is made of specially treated steel;
• the tacking stud 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.

a) fixer un crampon de type fixe sur lesdits moyens de support,

b) placer ladite pièce sur lesdits moyens de support, de manière qu'une première zone de cette pièce vienne en appui contre ledit crampon de type fixe,

c) fixer un crampon de type mobile sur lesdits moyens de support, au voisinage d'une deuxième zone de ladite pièce située à l'opposé de ladite première zone,

d) régler la position de la partie principale dudit crampon de type mobile par rapport à sa partie secondaire de manière que ladite partie principale vienne pratiquement en appui contre ladite deuxième zone de ladite pièce,

e) serrer ladite partie principale contre ladite partie secondaire,

f) frapper la (ou les) pointe(s) dudit crampon plaqueur de type mobile contre ladite pièce de manière à faire pénétrer cette (ou ces) pointe(s) dans cette pièce,

g) bloquer la (ou les) pointe(s) dudit crampon plaqueur de type mobile contre ladite pièce,

h) frapper la (ou les) pointe(s) dudit crampon plaqueur de type fixe contre ladite pièce de manière à faire pénétrer cette (ou ces) pointe(s) dans cette pièce, et à

i) bloquer la (ou les) pointe(s) dudit crampon plaqueur de type fixe contre ladite pièce.

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) fix a fixed type crampon on said support means,

b) placing 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 located opposite said first zone,

d) adjust 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) clamping said main part against said secondary part,

f) striking the tip (s) of said movable type clamping stud against said piece so as to make this tip (s) penetrate into this piece,

g) blocking the tip (s) of said movable type clamping stud against said piece,

h) striking the tip (s) of said fixed type clamp against said piece so as to make this tip (s) penetrate into this piece, and

i) block the tip (s) of said fixed-type clamping stud against said part.

• lesdits moyens de support peuvent être verticaux ou horizontaux ;
• on fixe au moins deux crampons plaqueurs l'un sur l'autre de manière à immobiliser une pièce à usiner de forte épaisseur sur lesdits moyens de support.

According to other characteristics of this process:

• said support means can be vertical or horizontal;
• at least two tackle clamps are fixed to each other so as to immobilize a workpiece of great thickness on said support means.

• la figure 1 représente une pièce à usiner fixée sur une table par une pluralité de crampons plaqueurs conformes à la présente invention :
• la figure 2 est une vue de dessus de l'un des crampons plaqueurs de la figure 1 coopérant avec la pièce à usiner ;
• la figure 3 est une vue de dessus détaillée d'un crampon plaqueur de type fixe conforme à la présente invention, les moyens pour bloquer la pièce à usiner n'ayant pas été représentés ;
• la figure 4 est une vue en coupe du crampon plaqueur de la figure 3, selon le plan de coupe III-III de cette figure, la pièce à usiner ainsi que des moyens d'usinage ayant également été représentés ;
• la figure 5 est une vue en coupe du crampon plaqueur de la figure 3, selon le plan de coupe V-V de cette figure, les moyens de blocage de la pièce à usiner, ainsi que la pièce à usiner ayant été représentés. Sur cette figure 5, les moyens de blocage sont représentés avant d'avoir réalisé le blocage de la pièce à usiner ;
• la figure 6 est analogue à la figure 5, et les moyens de blocage sont représentés en position de blocage de la pièce à usiner ;
• la figure 7 est une vue de dessous en perspective d'un crampon plaqueur de type mobile selon l'invention ;
• les figures 8 et 9 sont des vues analogues aux figures 3 et 4 de ce crampon plaqueur mobile.

Other characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing in which:

• FIG. 1 represents 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 tackle stud of Figure 3, along the section plane III-III of this figure, the workpiece and the machining means having also been shown;
• Figure 5 is a sectional view of the tackle stud of Figure 3, according to the cutting plane VV of this figure, the means for blocking the workpiece, as well as the workpiece having been shown. In this Figure 5, the locking means are shown before having achieved the blocking of 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.

Referring now to Figure 1 in which there is shown a part to machine such as a sheet 1 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 with a view to its machining by appropriate means (milling machine, drill, sander, ...).

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

We now refer to Figure 2 on which we see that the studs CF and CM tackers have tips 5a, 5b which partially sink in the edges 9 of the sheet 1.

For more details on CF fixed crampons, we now refer to Figures 3 to 6.

As can be seen in Figure 3, the CF crampon includes 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.

Housing 15a, 15b are formed in the body 11 symmetrically with respect to plane P.

Bores 17a and 19a, whose axes coincide and parallel to the plane P, open into the housing 15a on the one hand and outside the body 11 on the other go.

Similar bores 17b, 19b are arranged symmetrically by compared to plan 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 Figure 4, we see that in an operational situation the body 11 CF fixed tackle clamp is held on table 3 by means of a threaded screw 25 and that the ridges 23 are actually in abutment against the part 1 intended to be machined by a tool 27.

We now refer to Figure 5, on which we see the means for blocking the workpiece 1.

For the sake of brevity, we will now describe only the means of blocking arranged in the bores 17a and 19a of the body 11 of the cleat fixed CF, it being understood that the locking 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 includes a rod 29 slidably mounted inside the body 11 and ending with a point 5.

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

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

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

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

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

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 each other and by pushing axially on the screw 31 we causes an axial displacement of the rod 29.

It can be seen in FIG. 6 that in the locking position the rod 29 has been moved in direction of the workpiece 1, so that the point 5 of this rod penetrates partially in 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 of the rod 29 preferably form a slight angle a with respect to the face 37 of the body 11 which is intended to rest on the table 3.

This slight angle α is preferably 1 ° 30 '.

Reference is now made to FIGS. 7 to 9 in which a mobile type CM crampon according to the invention.

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

On the other hand, always for the sake of brevity, we will only describe the parts of this movable cleat which differ from the parts of the cleat fixed.

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

We see in Figures 7 and 9 that the main parts 11 and secondary 39 include complementary racks 41, 43.

We also see in Figures 7 to 9 that the main part 11 is crossed in the area of its rack 41 by an oblong hole 45.

We also see that the secondary part 39 is crossed in the area 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 tackle studs which come to be described result directly from the above.

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

We then place the piece 1 on the table 3 so that it comes in support against the three fixed studs CF1 to CF3.

We then fix the three mobile spikes CM1 to CM3 using screws 25, without, however, tightening these screws 25.

The position of the main parts 11 of the movable crampons is then adjusted. CM1 to CM3 so that the streaks 23 (see Figures 7 to 9) come practically resting against the edges of the part 1 opposite to those which cooperate with the fixed studs CF1 to CF3.

Once this adjustment has been made, the main parts 11 of the movable spikes CM1 to CM3 against the abutments 39 of these spikes using screws 25.

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

Using an appropriate tool, the heads of the screws 31 are then struck mobile 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 come in turn strike against the rods 29, thus causing the penetration of the spikes 5 into the edges of the part 1.

Once this penetration is obtained, the screws 31 are turned at using a suitable tool (electric screwdriver or other), which has the effect of being given that the nuts 35 are fixed in rotation, to bring the screws into 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 fixed studs CF1 to CF3.

This perfectly immobilizes the workpiece relative to the table 3, which then makes it possible to machine safely and with great precision the part 1 using suitable machining tools 27 (see figure 4).

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

It will be noted that the attachment of the tacking studs of the invention to the support means 3 is extremely easy and quick, 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 can have a low height, in particular less than the thickness of the part to be machine, which makes it easy to machine this part, particularly in the vicinity of its edges, especially in the case of a sanding operation ...

It appears from the foregoing description that the invention does indeed allow to solve the desired goal which is to fix in a very stable and secure way a part to machine on support means which can 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.

This is how, for example, we could consider tackle studs consistent with the above teaching, but each comprising only one or more of two points.

This is also how we could consider fixing at least two tackle clamps one on the other so as to immobilize a workpiece very thick on the table 3.

To do this, we could use a single screw 25 of greater length, suitable for crossing the two tackle studs at the same time and for engaging with table 3.

Claims (16)

Gripping 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 it comprises at least one point (5a, 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). Grip 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 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 whose head projects from said body (11) opposite said rod (29). Gripping 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). Clamping clamp (CF1 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 (α) relative to the face (37) of said body (11) which is intended to rest on said support means (3), so that said tip (29) exerts a force tending to keep said piece (1) supported on said support means (3). Clamping clamp (CF1 to CF3, CM1 to CM3) according to claim 4, characterized in that said angle (α) is of the order of one degree and thirty minutes. Gripping 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). Gripping 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). Gripping 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 secondary part (39 ), and a screw (25) passing through said holes (45, 47) and intended to come into engagement with said support means (3). Grip clamp (CF1 to CF3, CM1 to CM3) according to any one of the preceding claims, characterized in that said point (5a, 5b) has at least three faces. Clamping 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. Grip clamp (CF1 to CF3, CM1 to CM3) according to any one of the preceding claims, characterized in that it comprises two points (5a, 5b). Gripping 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 come into abutment against said part (1), non-slip means (23). Gripping 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. Method for fixing a workpiece (1) on support means (3) with at least one first clamping stud (CF1 to CF3) according to any one of claims 1 to 13, and at least one second clamp tackler (CM1 to CM3) according to any one of claims 7 to 13, characterized in that it comprises the steps consisting in: a) fix said first clamp (CF1 to CF3) on said support means (3), b) placing said part (1) on said support means (3), so that a first zone of this part comes to bear against said first clamp (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) situated opposite said first zone, d) adjust 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 to bear practically against said second zone of said part ( 1), e) clamping said main part (11) against said secondary part (39), f) striking the tip (s) (5a, 5b) of said second clamping stud (CM1 to CM3) against said piece (1) so as to penetrate this (or these) tip (s) (5a, 5b ) in this room (1), g) blocking the tip (s) (5a, 5b) of said second clamping stud (CM1 to CM3) against said part (1), h) hitting the tip (s) (5a, 5b) of said first tacking clamp (CF1 to CF3) against said part (1) so as to penetrate this (or these) tip (s) (5a, 5b ) in this room (1), and at i) block the tip (s) (5a, 5b) of said first tacking clamp (CF1 to CF3) against said part (1). The method of claim 14, wherein said support means (3) are vertical or horizontal. Method according to one of claims 14 or 15, in which the minus two tacking studs (CF1 to CF3 and CM1 to CM3) one on the other so as to immobilize a workpiece (1) of great thickness on said support means (3).

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