FR2596132A1 - PLASTIC CLAMPING STRIP - Google Patents

Abstract

CLAMPING STRIP IN PLASTIC MATERIAL FOR SECURING CABLE HARNESSES INCLUDING A FIXING ELEMENT INTENDED TO BE APPLIED BY PRESSURE ON A CONNECTOR ROD, THE CLAMPING STRIP BEING INCLUDED WITH HANGING ELEMENTS. THE HANGING ELEMENTS ARE IN THE FORM OF CROSS-SECTIONAL BARS 5 WITH A HOOK-SHAPED SECTION, EQUIPPED WITH RECESSED EDGES 6 ORIENTED TOWARDS THE FIXING ELEMENT 2, RAISED ABOVE THE BAND 1 IN A PROPORTION CORRESPONDING TO THE HEIGHT OF HEAD "K" OF LOCKING HOOK 7, THE FREE PASSAGE TEMPLATE "D" BETWEEN THE RECESSED AREA 6 OF A CROSS BAR 5 AND THE REAR WALL 9 OF THE NEIGHBORING CROSS BAR 5 BEING IN THE OCCURRENCE, SMALLER THAN THE WIDTH OF HEAD "B" OF LOCKING HOOK 7. THE PRESENT INVENTION APPLIES IN PARTICULAR TO THE FIXING OF ELECTRIC WIRE HARNESSES.

Description

- 1

  The present invention starts from the plastic strap indicated in the generic definition, and which is intended to be preferably attached to a threaded rod.

  The clamping strips of this type known are characterized by the fact that their snap-fastening elements are frequently in the form of transversely disposed teeth, which are connected to each other by spacer elements or at their part. central (DE-OS 31 43 775) or at their ends (DE-OS 28 47 505), and which cling in retaining claws. In this case, the tightening strip, consisting of alternations of teeth and nipples, is tightened, after passing it around the cable or the bundle of cables to be fixed, to the point where it becomes just possible. by pushing with the thumb, passing a tooth past the nose of the claw hook and get, releasing slightly the clamping force, that it clings into the throat of the claw . If you then want to loosen the strip, then you must start by tightening until the tooth can disengage the throat of the claw and pass on the other side of the nose of it. This need to exert a clamping force on the strip each time it is brought to close and open is felt as a disadvantage, in that it requires an additional physical effort to achieve it. It is also difficult to grasp the end of the strip, just behind the retaining claw, between the thumb and forefinger, and pull or push it again towards the support plate.

  The present invention therefore proposes to give the recessing and locking elements of the clamping strip a configuration such that the hooking and unblocking thereof is considerably facilitated.

  In order to solve this objective it is proposed to use the geometrical feature set forth in claim 1, the subclaims still making other configuration features of advantageous or useful character. The recessed mounting bars proposed according to the invention have, compared with the known recessing teeth, the great advantage of what is possible, during the attachment of the clamping strip, after the have passed around the cable or bundle of cables to be fixed, to apply them by pressure, almost as if they were corners, in the free space existing between two neighboring transverse bars, the hooking edge concerned

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  finding in this case, at first, slightly pushed back

  by compression outwards by the opposite rear wall, then after having crossed the hooking edge of the locking hook, then resuming its initial position under the simple effect of its natural elasticity, and coming, in doing so, to embed itself , in a solid grip, under the hooking edge of the locking hook.

  The release of the clamping strip is also performed under considerably simpler conditions than in the case of known tooth strips. It suffices to simply raise the free end of the strip to achieve it. The transverse bar in the embedded position moves away from the locking hook by bending, under the effect of the action exerted, and the free passage template thus increases until the two embedding edges can slide 1 one in front of the other.

  Thanks to the rounded shape of the front edges of the transverse bars, according to claim 2, the head, also of rounded shape, of the locking hook, has easy to be inserted between two transverse bars, while the actual configuration of the strip of clamping, according to claim 3, provides the transverse bars a satisfactory stability. It is also, in accordance with claim 4, particularly advantageous to provide, at the locking hook, a recess groove, and at the cross bars of the recess faces of rounded shape. It is thus ensured that the mounting edges of the transverse bars will fit, over their entire surface, in the recess groove of the locking hook, and this whatever the oblique positions that can have the strip in the clamping position.

  The attached schematic diagram represents two exemplary configurations of the present invention, which we will give in

  the following a more detailed description. The different illustrations represent respectively:

  Figure 1 - A tightening strip with its fixing part for mounting on threaded rod, longitudinal sectional view, Figure 2 - the same clamping strip, plan view, Figure 3 - the fixing part of the clamping strip, view of 1 before, -3

  Figure 4 - A clamping strip mounted on a threaded rod, with the band portion in the clamping position in the condition corresponding to the smallest possible clamping diameter.

  Figure 5 - A partial sectional close-up view of the clamping strip during its application by pressure on the locking hook, Figure 6 - the same detail view after embedding of the hooking edge, Figure 7 - The same detail view when the strip is unhooked, FIG. 8 - a tightening strip in the mounted position as in FIG. 4, but with the largest possible clamping diameter, and

  Figure 9 - A partial sectional view in large plan of the clamping strip after embedding the fastening edge.

  The clamping strip, made of plastic material with hard elastic cedar molding, consists essentially of a clamping tape forming a collar (1) to ensure the fixing in position of cables or bundles of cables in different clamping diameters, and a fastening portion (2) to be press fit on a stud, preferably a threaded rod (13), welded to a support plate (14) or otherwise anchored (Figures 4 and 7) .

  For this purpose, the fixing element (2) comprises a fitting orifice t (3) which, in the configuration example presented here, consists of curved clamping walls (4) elastically connected to each other. other. It is obvious that one can also find at the fitting orifice (3) other compatible fixing devices for fitting on a threaded rod.

  The gripping strip (1) is made integral, by molding, with the lower part of the fastening element (2), and perpendicular to the axis "a" of the fitting orifice (3). which makes the strip (1), after fitting of the fastening element (2) on the threaded rod (13) is detached from the support plate (14) parallel thereto. The gripping strip (1) comprises, arranged at regular intervals, transverse bars with hook-shaped section (5), having hooking edges oriented in the direction of the fastening element (2). This fastening element (2) comprises, at its opposite upper end, a locking hook (7) rounded upwards and whose shape is adapted to the

  drawing of the bars, and whose attachment edge (8) is oriented in the opposite direction to that of the fastening element (2), wherein the attachment edges (6) of the transverse bars (5) are fit after the strips have been passed around the cable (15) or cable harness (16 to be fixed (Figures 4 and 7).

  The hooking edges (6) are raised above the upper part (17) of the gripping strips (1) in such a proportion that the hooking edge (8) of the gripping hook locking (7) can be inserted under the hooking edge (6) during embedding. Furthermore, the free passage space "d" existing between the hooking edge (6) of a transverse web (5) and the rear wall (9) of the next web (5) is, for a question practical opportunity, provided slightly smaller than the width of the head "b" of the locking hook (7), so that it is obviously possible to make it penetrate, under the action of a light pressure, in the free space "d", but that, on the other hand, it can no longer disengage itself after embedding the hook

(7) in the hooking edge (6).

  To facilitate the introduction of the rounded hook (7) in the passage space "d" existing between the hooking edge (6) of the crossbar (5) provided for the hooking, and the opposite rear wall (9), the transverse webs (5) have rounded front edges (19), the curved side of which, on one side, goes down to the hooking edge (6), and the another side gradually integrates into the rear wall (9). To give the lateral bars (5) the necessary stability, the rear walls (9) turning their back to the fastening element (2) are arranged obliquely with respect to the strip (2), the degree of inclination corresponding preferably between 70 and 805, which makes the bar width "s" increase from the front edge (19 to the strip (1), it being understood that the front wall (10) is under The embedding edge (6) is, for ease of demolding, arranged vertically with respect to the upper face of the strip (17), and the strip (1) comprises a demolding hole (20) arranged vertically under the hooking edge (6) and whose size is studied to correspond to its length and its width.

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  As shown in FIG. 5, the locking hook preferably comprises an embedment groove (11) while the transverse bars (5) have recess faces.

  (12) correspondingly rounded, which, whatever the degree of obliquity that the strip (1) can present in the clamping position, (see FIGS. 6 and 9), are in bearing contact in the groove of recess (11) over their entire span. In this way, it is ensured that the gripping strip (1) is gripped in optimum position.

  To ensure good lateral guidance of the gripping strip (1) in the latching position, it is provided at the fastening element (2), secured to it by molding, on both sides of the hook locking (7), guide tabs (18).

  Figures 4 to 9 illustrate the operating mode of the strip for different clamping diameters.

  Figure 4 shows a clamping strip mounted on a threaded rod (13) with the clamping strip (1) in the hooking position, in the case of a single cable (15) of small diameter. In this case, the strip (1) is passed around the cable (15) by pulling it tightly so that it has a tight grip, and then, as shown in FIG. direction indicated by the arrow so that the locking hook (7) comes to fit as a wedge between two transverse bars (5) neighbors, the bars on the left in the diagram having under this action a slight lateral cedar in the sense materialized by the small arrow. As soon as the embedding edge (8) of the locking hook (7) has passed the constriction between the embedding edge

  (6) and the rear wall (9), the transverse bar (5) occupying the left position in the diagram resumes by elastic return its normal position.

  The rounded recess face (12) is here to fit, over its entire range, in the recess groove (11) of the locking hook (7), which allows to have a lock in absolutely safe position (figure 6).

  If it is then desired to disengage the strip (1), it is sufficient for this purpose, as shown in FIG. 7, to pull the free end of the gripping strip (1 ') in the direction of the arrow. The recess edge (6) of the crossbar (5) is in this case released from the embedding groove (11) to -6

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  the ridge (6) passes in front of the embedding edge (8) of the locking hook (7). This attachment principle, however, excludes any possibility of stall or spontaneous release, for example under the action of an external force that would be exerted at the grip portion of the strip (1).

  Figure 8 illustrates, as Figure 4, a clamping strip mounted in position, but in the case of fixing a bundle of cables (16) in the condition corresponding to the largest possible clamping diameter. The embedding position of the gripping strip (1) with the locking hook (7) is in this case particularly oblique. But thanks to the recessed faces of rounded shape (12) and the curvature that has correspondingly the embedding groove (11) is nevertheless obtained, even in this particularly oblique position, as can be seen in Figure 9 , irreproachable locking conditions of the strip (1) in the locking hook (7) by the mechanical action resulting from their shape. To release the strip (1) pull on the end of the strip (1 ') in the same way as shown in Figure 7.

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Claims (3)

claims   1 - Plastic clamping strap for holding cables, pipes and bundles of cables in position, comprising a fastening element which forms an integral part thereof and which is intended to be applied by pressure on a fitting rod , the clamping strip being in this case made by integrally molding the lower end of the fixing element, and provided with fastening elements, regularly spaced, arranged transversely to the longitudinal direction of the strip, and which can be embedded in a locking hook which is also made, by molding, integral with the fastener element, which can be removed by the fact that the fastening elements are in the form of cross-section webs (5). hook-shaped, provided with mounting edges (6) oriented towards the fastening element (2), raised above the strip (1) in a proportion corresponding to the head height "kw of the locking hook   (7), the clearance template "d" between the embedding edge (6) of a transverse bar (5) and the rear wall (9) of the neighboring transverse bar (5) being in this case smaller than the width of the head "b" of the locking hook (7).   2 - Tightening strip of plastic material according to claim 1, characterized in that the transverse bars (5) have rounded frontal edges (19), the curved face of which, on one side, hooking edge (6), and the other side gradually integrates into the rear wall (9). 3 plastic clamp according to claim 1 or 2, characterized in that the rear walls (9) of the transverse webs (5) rotating their back to the fastening element (2) are arranged obliquely with respect to the strip (1), the width of the strip "s" increasing in the direction of the strip (1) 4 - Plastic strip next   claim 1, characterized by the fact that the locking hook (7) has a mounting groove (11), while the transverse bars (5) have, for their part, rounded mounting faces (12) in correspondence which, whatever the degree of obliquity that the strip (1) can present in the gripping position, is in bearing contact, in the insertion groove (11) of the locking hook (7), over their entire scope.