ES2258684T3 - CENTERING CLAMP. - Google Patents

Abstract

Centering fastener for centering immobilization of a workpiece to be machined, consisting of a centering mandrel (5) seated on an adapter plate (4) and arranged above a retaining hook (1) - formed by a hook ( 2) and a hook arm (3) - of the actuator (SA) of the fastener, whose mandrel is provided with a socket groove (6) for the fastening hook (1), providing protection elements that are applied to the flank of the clamping hook to prevent the entry of foreign bodies into the passage opening of the clamping hook of the adapter plate (4), characterized in that the socket groove (6) of the centering mandrel (5) is of closed construction in the side (7) away from the hook and because on the other side (8) a sliding cover (9) of the slit that follows the regulation movement of said arm is associated to the arm (3) of the hook.

Description

Centering Bra

The invention concerns a so-called bra centered for the immobilization centered of a workpiece to machining according to the preamble of claim 1.

Centering fasteners, which are also denominated pit fasteners, they are sufficiently known and are they are in use, so that in itself is not required in this regard A special printed demonstration. However, it is possible to refer, by example, to document DE-A-297 13 607 U1, in which a fastener of centering of this class, including a centering mandrel as Execution example for a piston drive especially configured. Both the so-called adapter plate and the mandrel of centered seated on it have a slit of passage or lace correspondingly adapted for the holding hook, whose movement up and down overlaps a transverse movement that requires a slit correspondingly long and open on the adapter plate. The part of the lace slit that extends into the mandrel of centered consists of a split open back and forth, whose orientation corresponds to that of the slit part of the adapter plate Such centering fasteners are necessary for mechanizations to be carried out in work pieces that presuppose that the work piece has a centering immobilization, for which such work pieces (for example, weld plates in a certain position) are provided with a hole for It can be properly plugged into the centering mandrel. The holding hook taken to the holding position cares then of the immobilization of the piece or work pieces Against the adapter plate.

This function is performed without major complications from the usual centering fasteners so far from the class cited at the beginning. It is disadvantageous in this respect the fact that, especially in the case of mechanization of welding to be performed in most cases, can get weld spatter to the open grooves and hinder or even completely block the movement function of the holding hook and possibly also of its mechanical regulation. Especially when such centering fasteners are they operate in the course of a manufacturing chain or in the course of mass production, any disturbance of operation in such bras naturally represents a annoying or unwanted interruption of work to be avoided as far as possible.

A solution to this problem is proposed. in document DE-A-201 00 701 U1, to which, otherwise, the preamble referred to beginning. The protection elements to prevent the entry of foreign bodies consist of sealing or scratching elements that they are guided in slits arranged on both sides of the hook fastening on the head of the centering bra and which, bent to way of leaf springs, apply to the two flanks of the hook clamping When lifting the clamp hook to the slit of the centering mandrel open to both sides, both scrapers must be dragged during regulation in their guide grooves. It can be questioned if it really is this measure is always guaranteed, but it can be verified that the centering mandrel groove open to both sides and also the passage opening remain open back and forth the holding hook precisely in the holding position and mechanization.

The invention is based on the problem of remodeling and easily improve a class centering bra cited at the beginning in the sense that they are avoided in very broad degree functional disturbances motivated by fouling in a centering bra of this class both in the centering mandrel as in the passage groove of the holding hook.

This problem is solved with a bra centering of the class cited at the beginning according to the invention by means of the features set forth in claim 1.

Therefore, thanks to these two simple measures the accessibility of fouling has been very significantly reduced of any kind or the entry of small foreign bodies into the slits, being able to also take care of itself, by means of a advantageous improvement that will be explained in more detail, that the upper part of the lace groove of the centering mandrel that itself is less threatened and that It is located on the end of the hook.

As regards the closure on the side away from the hook of the mandrel lace slit centered, this can materialize naturally by means of a correspondingly adapted cover plate that can be stuff into the surface of the mandrel. Since this would be linked to a cost of manufacture and adaptation not negligible, this cleft closed back occurs more advantageously by means of a mechanization of start of shavings of the mandrel of centered.

Other class protection covers are also known certainly according to the documents DE-A-40 25 530 A1 and DE-A-36 02 738 C1, but objects of these documents do not consist of centering fasteners, but in entirely normal clamping devices with clamping arms tiltable arc, that is to say its protective covers special adapted to this motive of the clamping arms not are suitable for centering fasteners of the kind here interest

The centering bra according to the invention and Additional advantageous refinements are explained below. in more detail using the graphic representation of examples of execution.

They show schematically:

Figure 1, partially in section and in elevation, the top of the centering bra, specifically in the open position;

Figure 2, the centering bra according to the figure 1 in holding position;

Figure 3, the centering bra according to the Figure 2 in a special embodiment; Y

Figure 4, the class centering bra of conventional construction for comparison and illustration of a possible embodiment of the drive of the bra.

Referring to figure 4, the bra centering still consists of centering mandrel 5 seated on an adapter plate 4 and arranged on a retaining hook 1 of the SA drive of the fastener formed by a hook 2 and a hook arm 3, whose centering mandrel is provided with a lace groove 6 for clamping hook 1.

The entire area of the open cleft of the mandrel centering 5 and adapter plate 4 is illustrated in large features in figure 4 with a crossed scratch and, according to the dimension in width dependent on the load of the clamping hook 1, can have a width, for example, of the order of up to 10 mm, that is that the mechanical adjustment SM - located under the adapter plate 4 - of the SA drive of the fastener operated with a SZ adjustment cylinder is accessible from outside at any time for corresponding small parts.

For a centering bra of this class it is important now, with reference to figure 1, that the cleft of socket 6 of centering mandrel 5 be closed on side 7 away of the hook and that on the other side 8 is associated with the arm 3 of the hook a slider 3 of slit cover that follows the regulation movement of said arm.

As can be seen in the representations of Figures 1 to 3, this slider 9 of the slit cover, requested with a spring 13, is advantageously housed or embedded directly on the adapter plate 4, that is, advantageously also in such a way that the adapter plate 4 is provided, in its connection surface 10 towards the fastener drive SA, of a closing plate 12 covering the drawing recess 11 for the slide 9. Therefore, on the adapter plate 4 it is necessary to mill only a corresponding slot in which it is inserted later without problems the slide 9 with its spring 13 and it stays there with the closing plate 12.

Referring to figure 3, which shows the retaining hook 1 corresponding to figure 2 in the position of clamping with respect to a workpiece W that only appears hinted, it is also arranged high in the lace groove 6 of the centering mandrel 5, above the holding hook 1, a elastic covering 14 of the slit that can be retracted from said hook when returning to the opening position and with which care is taken to keep this area constantly covered up too upper slit threatened by body entry strangers, albeit to a lesser extent, as hinted at with dashed lines also in figure 3 for the opening position of the clamping hook 1.

Claims (4)

1. Centering fastener for centering immobilization of a workpiece to be machined, consisting of a centering mandrel (5) seated on an adapter plate (4) and arranged above a retaining hook (1) - formed by a hook (2) and a hook arm (3) - of the actuator (SA) of the fastener, whose mandrel is provided with a socket groove (6) for the fastening hook (1), protection elements being provided that are they apply to the flange of the clamping hook to prevent the entry of foreign bodies into the passage opening of the clamping hook of the adapter plate (4), characterized in that the groove of engagement (6) of the centering mandrel (5) is of construction closed on the side (7) away from the hook and because on the other side (8) a sliding cover (9) of the slit that follows the regulation movement of said arm is associated to the arm (3) of the hook. 2. Centering fastener according to claim 1, characterized in that the slit cover slide is arranged inlay in the adapter plate (4). 3. Centering fastener according to claim 2, characterized in that the adapter plate (4) is provided, on its connecting surface (10) towards the actuator (2) of the fastener, with a closing plate (12) covering the recess of drawing (11) for the slide (9). 4. Centering fastener according to one of claims 1 to 3, characterized in that an elastic covering (14) is arranged above the retaining hook (5) of the centering mandrel (5). of the slit that can be retracted from said hook when returning to the opening position.