FR2679815A1 - Device for adjusting (fitting), for the purpose of clamping, components on a machine-tool bed (table) - Google Patents

Abstract

The device for adjusting, for the purpose of clamping, components on a machine-tool bed, of the type comprising a screw jack associated with stackable elements inserted between a clamping flange and the bed of the machine tool, is noteworthy in that it is made up, in combination, of: - an element (1) for bearing and fastening to the bed (T) of the machine tool, - intermediate elements (2, 3, 4...) of different heights and which can be stacked together as need be; - an upper element (5) of the screw jack type, and in that the bearing element (1), the intermediate elements (2, 3, 4...) and the upper element (5) are set out with mutual centring and locking means.

Description

SETTING DEVICE FOR THE CLAMPING OF WORKPIECES ON A TABLE
OF MACHINE TOOL.

 The object of the invention relates to the technical sector of machine tool accessories.

 I1 is known to perform the clamping of workpieces on machine tool tables by a flange associated with a draw rod secured to the table and by screw jacks mounted at the end of stackable wedging elements and leaning under the flange.

 To improve the conditions of use, we thought of stacking wedging elements of different heights and providing telescopic screw jacks.

These particular arrangements can be classified according to two types each presenting disadvantages
a) they are basic (stacking with only a centering of the elements, no stable base element connected to the table), and then they do not meet the criteria of yield, solidity, convenience of handling
b) they are sophisticated (stacking of elements with complex centering and locking means, telescopic jack, assistance by springs, etc.) and then they become accessories, expensive, difficult to handle.

 The wedging device according to the invention overcomes these drawbacks and brings many advantages in the sense that it is simple in construction, therefore economical, that it is stable and easy to handle, that it offers all the guarantees of safety , and that it allows fast and precise clamping of parts on machine tool tables.

 For this, and according to a first characteristic, the wedging device is constituted in combination of a support element and fixing on the table of the machine tool, intermediate elements of different heights and stackable together as required, and of an upper element of the screw jack type, and in that the support element, the intermediate elements and the upper element are arranged with centering and locking means between them.

 According to another characteristic, the support and fixing element on the table of the machine tool is constituted by a sole having at least two passage slots for tightening bolts relative to the corresponding arrangements fitted to the table, and a median post for stacking an intermediate element.

 Another characteristic is that the various components of the wedging device stacked in superposition by male-female centering shapes are locked in position by needle screws cooperating with grooves made in the male centering bearings.

 These characteristics and others will emerge from the description which follows.

To fix the subject of the invention without however limiting it, in the appended drawings:
- Figure 1 is a perspective view separately illustrating the components of the wedging device
- Figure 2 is a sectional view showing an example of stacking elements
- Figure 3 is a view illustrating two wedging devices illustrated for clamping a part.

 In order to make the object of the invention more concrete, it is now described in a nonlimiting embodiment illustrated in the figures of the drawings.

 In all that follows, a wedging device is described with components whose general geometry is cylindrical for reasons of simplicity of execution. It is obvious that other sectional shapes can be provided without departing from the scope of the invention.

 The device (D) essentially comprises an element (1) for supporting and fixing on a machine tool table (T), intermediate elements (2,3,4 ...) of different heights stackable on the element (l ), and a screw jack (5) mounted above the last intermediate element.

 The device (D) thus produced is intended, as shown in Figure 3, to be positioned between the table (T) and the end (BI) of a flange (B) whose other end (B2) s' presses on a workpiece (P) to be machined, while in a known manner, a locking means (M) passing through the flange (B) and secured to the table (T), allows firm clamping of the workpiece (P) .

 The element (1) is for example made in the form of a parallelepiped sole (1.1) having at the ends of the notches (1.2) intended for fixing on the table of the machine tool, for example by bolts (6) cooperating with the grooves (Tl) of the table (Figure 2).

 In the center, the sole carries a cylindrical stud (1,3) on which is centered and positioned one of the intermediate elements (2,3,4 ..) equipped for this purpose with a bore (2.1, 3.1, 4.1 .. .) at one end, and a stud (2.2, 3.2, 4.2 ...) at the other end. Each chosen intermediate element is locked in position relative to the previous one and relative to the stud of the sole by needle screws (7) cooperating with a groove (1.3.1, 2.2.1, 3.2.1, 4.2.1 ... ) made on the studs.

 The screw jack (5) is centered and positioned on the last intermediate element in the same way by a bore (8.1) of its body (8) covering the post (4.1) and is retained there by the needle screws (7). Above the bore (8.1), which is greater in height than the height of the studs (4.1), a tapping (8.2) of smaller diameter, receives an adjustment screw (9) whose upper part projects beyond the body has a threaded seat (9.1) for a bearing surface under the flange (B) such as a nut (10), while at the lower end, the screw (9) carries a retaining means of the circlip type ( 11) limiting the output of the screw.

 Thus, by judicious superimposition of intermediate elements established at different heights, the setting is ensured at the desired height as a function of the parts to be blocked (FIG. 3), this in a quick, safe and stable manner, with elements of geometric shapes simple therefore economical.

Claims (4)

 1 / Wedging device for clamping parts on a machine tool table, of the type comprising a screw jack associated with stackable elements inserted between a clamping flange and the machine tool table, characterized in that it is made up in combination  - an element (1) for supporting and fixing on the table (T) of the machine tool,  - intermediate elements (2,3,4 ...) of different heights and stackable with each other as needed  - an upper element (5) of the screw jack type, and in that the support element (1), the intermediate elements (2,3,4 ...) and the upper element (5 ) are arranged with centering and locking means between them.  2 / wedging device according to claim 1, characterized in that the element (1) of support and fixing on the table (T) of the machine tool is constituted by a sole (1.1) having at least two slots (1.2) passage for clamping members (6) relative to the corresponding arrangements fitted to the table, and a median post (1.3) for stacking an intermediate element.  3 / wedging device according to claim 1, characterized in that the various components (1,2,3,4,5) of the wedging device stacked in superposition by male-female centering shapes are locked in position by screws needles (7) cooperating with grooves made in the male centering surfaces.  4 / wedging device according to claim 1, characterized in that the screw jack (5) comprises a body (8) with axially at its lower part a bore (8.1) for centering relative to the tenon of an intermediate element, followed by a tapped hole (8.2) of smaller diameter into which is screwed an adjustment screw (9) with upper bearing surface (10) and limited in the extended position by a stop means (11) associated with the bore (8.1) of the body.