FR2659128A1 - Adjusting and clamping member for cores of space frames - Google Patents

Abstract

Adjusting and clamping member for cores of space frames esesntially including a compensation member (9) interposed between the stationary member (7) and the moving member (8), means for fixing and tensioning a bar (4) and a common core (1) exhibiting the same screw pitch as the assembly bolt (3) and the same calibre as the stationary and moving members (7) and (8) and a smaller thickness than the latter, so that they can all be manipulated with the aid of a common tool, and acting as a stop piece and backrest (prop) or lock nut for the nut (7) when the bolt (3) is immobilised in the core (1) and the nut (8) against the bar (4). Particularly applicable to means for assembling space frames for arches with balanced bars.

Description

The present invention relates to an intermediate or mediating member for regulating the positions of tension and fixing of the clamping means against the core of the space frame means and of the clamping means against the bar of the frame while also intervening, as a security organ to guarantee the immobility of the latter.

The invention is a simple but most effective solution, taking into account that the most advantageous practical solutions must preferably be as simple as possible.

The invention proposes a solution which can be perfectly incorporated into known space armature systems and which can be adapted, preferably, to the "NUCLOS" system existing on the market and to which, in particular, and without this implying any alteration of the organ of the body. The invention can be incorporated without any preparation or manipulation of the opening.

The invention constitutes an important innovation and as regards the tensioning and adjustment members of the space bar reinforcing cores which are provided with means for adjusting against the reinforcing core and other clamping means and of tension against the bar thereof.

Spanish Patent No. 481,931 describes a system of this nature, which essentially comprises the aforementioned means and in which the object of the present invention can be incorporated while fully and fundamentally retaining said means of this patent.

In said patent and in the systems of this kind which are used at present, the adjustment and abutment member bearing against the core is fixed with the aid of glue at the point or minimum dimension of penetration and, although this is a commonly used solution, it has the major drawback of its lack of security when the metric is not of a large caliber.

The problem is that, in small metrics and due to the reduced contact surface between the tightening member and the bolt, it is possible to loosen, using a flat wrench, the member 'adjustment by moving it from the prefixed dimension limit point so that the bolt can penetrate the core.

This notion is fundamental because, to ensure the proper functioning of the system, the penetration into the assembly means (sphere) must be a function of the metric, that is to say more or less constant for each metric in order to absorb the tolerances. of manufacturing, which may be of greater penetration but never less than that pre-established.

Frequently, the problem of the detachment of the tightening member (nut), under the simple effort of the flat mounting key, only arises in the case of small metrics because, for higher metrics (M.20 and successive) , this disadvantage should not arise, insofar as the maximum effort that can be exerted by a person with the key must be less than the resistance that the union of the latter with the glue will offer.

To understand this problem, it should be known that, in the frame mounting technique, the bar, the tube or the spacer has, at each end, a bolt or stud and two fixing members which constitute the gold. - motionless gane, fixed by bonding, and the movable member for tensioning the assembly.

When the worker mounts the bar, he begins by adjusting and screwing the bolt into the hole in the core, using the fixed member, using a flat wrench. If the ltef- fort slightly exceeds the pressure supported by the glue of this organ, it will loosen and the penetration of the bolt and its tightening or screwing will prove to be insufficient or defective and the bolt will work unduly, with a high rate of effort. bending and shearing.

Theoretically, the mechanical solution, effectively heard, is to block or lock said fixed member (fixed nut in real form) at the point or dimension of the distance necessary to ensure a minimum of bolt for its mounting on the core, so that it it even turns out to be superfluous to glue, assemble or physically fix the said member and it is enough simply to keep it fixed in its position, while the frame is tensioned and mounted, or while the bar itself is mounted .

Complementarily have other disadvantages of the tensioning means of the movable clamping member.

The moving or tensioning member which exerts pressure against the bar plate (tube plug) is liable to loosen as a result of vibrational phenomena.

The solution offered by the invention consists in having a third movable adjustment, tightening and safety member for the assembly means described, which is constituted in substance of a member itself screwed onto the bolt, that is to say which has the same metric as the latter, member inserted before mounting and definitively between the fixed member and the movable member.

This compensating member is characterized by the fact that it consists of a simple nut or the like, screwed onto the bolt and capable of being manipulated by the same flat wrench with the help of which the remaining elements for tightening the clamp are mounted and tightened. closed off.

Another detail of the invention consists in that this compensation member is simply inserted between the clamping nut (movable) against the core and the clamping nut (stationary) against the tray of the bar, and in that that it has the same thread size as the bolt.

One of the solutions offered by the method consists of the triple mission of the compensation body.

According to the invention, by positioning the compensation nut on the stop suitable for tightening the movable nut (screwing against the core), the latter can be screwed to the maximum position and, to do this, the compensation nut serves as a lock nut (circumstantial or optional) so that the stud can penetrate, to the extent required to the stop of the hole, partially and along the path required by the tension of the arma ture, but without ever presenting the possible defect of loosening implying a faulty penetration.

Another solution is that the compensation nut, after having fulfilled its abovementioned collaboration mission, can be loosened, moved and kept in an intermediate function between the mobile nut and the stationary nut.

Another solution, according to the invention, is that the compensation nut can be kept screwed against the (movable) tightening nut in the core, serving as a locknut and as security.

Another characteristic solution, according to the invention, is that this compensating member can participate in the tightening or screwing of the (stationary) tightening nut against the tray of the bar, preferably being kept tight against it, in acting as a lock nut, to ensure fixing against any additional forces that could affect the joint tightening function between the nut (stationary) and the plate.

The essential characteristics of the invention appear more clearly with the aid of the description which follows, made with reference to the accompanying drawings and in which, somewhat schematically, and only by way of example, the preferred details are represented of the invention.

In these drawings - Figure 1 is a side elevational view in partial section of a set of stamping or assembly flanges in the disassembled position - Figure 2 is a view similar to the previous in the mounting position; - Figure 3 is a view similar to the previous in the locked position of the fixed nut; - Figure 4 is a view similar to the previous in the immobilized position of the movable nut; - Figure 5 is a side elevational view showing the embellishing envelope of the assembly members - Figure 6 is an elevational view of a knotting assembly of several bars on a single core.

With regard to these figures, we will see that they give a representative example of the means involved, that is, with regard to the traditional elements of a bar reinforcement, those incorporated according to the invention, as well as implementation steps according to the mounting or reinforcement process recommended.

 This is how we can see that the traditional and preferably massive spherical core (1), according to a more suitable practical variant, has tapped holes (2) for fixing the end (3a) of the bolt (3) housed in the tubular bar (4) and retained by a head (3b) inside the conical plate (5) at the end of the bar (4).

The clamping members (7) and (8) are incorporated into the bolt.

A clamping member (7) against the core (1), traditionally fixed or fixed in a limit position (Fig. 1) offers a minimum margin of penetration "C" to guarantee that this minimum recommendable "C" of the end ( 3a) of the bolt (3) penetrates well into the thread of the tapped hole (2).

The fixing of the clamping member (7), optionally made using glue or any adhesive, is not necessary according to the invention. The nut (7) remains locked on the bolt, in its final position, thanks to the compensation member (9) thus ensuring, in all cases, the minimum penetration "C". Insofar as this blocking is achieved at the end of the bar manufacturing process, the contractions generated on them during the welding carried out between the tube element (4) and the frustoconical plate element ( 5) do not affect the fixed length that each bar must have between the outer faces of the fixed members located on each side of said bar element, when the bolt is also blocked against the plate element (5).

According to the invention, between the clamping member (7) against the core (1) and the movable clamping member (8) against the plate (5) of the bar is incorporated a compensation member (9) which is a nut of the same screw pitch as the bolt (3), of the same gauge characterizing (7) and (8), in order to be able to use a common tool (open-end wrench), and of a size less than the latter to ensure their positioning and their movements.

Thus, after having put the nut (7) in the position of FIG. 1 and taking the place of a lock nut and a counter-bolt, the compensation nut (9) is screwed firmly onto the end ( 3a) of the bolt (3), in the hole (2), ensuring tightening and tensioning as appropriate.

This position can be adjusted to the desired extent, since the compensating member (9) can be moved, still using the same flat wrench, and put in the desired position within the limits of the bolt (3).

After having tensioned the assembly between (7) and (1), the movable nut (8) is screwed against the plate (5) of the bar (4).

The compensation nut (9) moves and tightens against (8), acting as a locknut and blocking and immobilizing. Locking is thus ensured against any possible loosening of (8) and guarantees, by mechanical impossibility, any distension or loosening of the assembly with (7).

In addition, the anchoring assembly is covered with a sleeve (10) adapting to the perimeter of the nuts (7), (8) and (9) (Fig. 5.).

The zen nature of the invention having just been sufficiently described, let us point out for all practical purposes that it is not limited to the exact details of this presentation, but on the contrary sty are found all the modifications which one deem relevant, provided that the essential features of the invention claimed are not altered.

Claims (7)

1. Adjusting and tightening member for space frame cores comprising a threaded means for anchoring to the bolt (3) which is fixed in threaded holes (2) of a spherical core (1), which comprises a fixed member (7) for clamping against the core and a movable member (8) for tensioning against the bar (4), characterized in that there is situated between the two a compensating member (9) having the same pitch as the bolt (3) and the same caliber as the fixed (7) and mobile (8) members. 2. Device according to claim 1 characterized in that the caliber of the compensation device (9) is at most the same as that of the fixed (7) and mobile (8) devices. 3. Body according to claim 1 characterized in that the compensation member (9) is a nut thinner than the other two (7) and (8). 4. Body according to any one of the preceding claims, characterized in that the position of the fixed member (7) is always defined at the end of the bar manufacturing process. 5. Body according to any one of the preceding claims, characterized in that the compensation member (9) is supported on the member (7) for clamping against the core (1) by acting as a stop and against -buckle for mounting and secure blocking of the bolt (3) in the threaded hole (2) of the core (1). 6. Device according to any one of the preceding claims, characterized in that the compensation device (9) adapts and screws against the movable device (8) by blocking it and immobilizing it against the bar ( 4). 7. Device according to any one of the preceding claims, characterized in that the compensation device (9) is manipulated using the same tool (open key) as that used for the fixed (7) and mobile ( 8).