A bracket locking clamp

Abstract: To make a clamp commonly usable for brackets having different thicknesses. A clamp 10 includes a base plate 11 to be fixed to an automotive wiring harness by taping and a box portion 12 integrally formed with the base plate 11, and an arm 13 having a lock claw 13a at its leading end projects from a rear part of the lower inner surface of the box portion 12 into a hollow portion 14 of the box portion 12. A bracket 4 projecting from a vehicle body is inserted into the hollow portion 14 of the box portion 12 and the lock claw 13a is inserted into a hole 4c formed in the bracket 4 to lock the bracket 4 and the clamp 10. Thinned and elastically deformed thickness take-up portions 15 are formed at the opposite side walls of the box portion 12. In the case that the bracket 4 being inserted into the hollow portion 14 of the box portion 12 is thick, the thickness take-up portions 15 extend to enable the insertion of the lock claw 13a into the hole 4c of the bracket 4.

Description: The present invention relates to a bracket locking clamp for mounting a wiring harness to be arranged e.g. in an automotive vehicle on a bracket projecting from a vehicle body and is particularly designed to commonly use such a clamp regardless of the thickness of brackets. A bracket locking clamp according to the preamble of claim 1 is disclosed in GB 2 173 250 A. As shown in FIG. 4, in order to fix a wiring harness W/H to a vehicle body 3, a bracket locking clamp 1 is fixed to the wiring harness W/H by tape 2 and is locked with an L-shaped bracket 4 projecting from the vehicle body 3. The clamp 1 includes a base plate 1a the opposite ends of which are fixed to the wiring harness W/H by the tape 2, and a box portion 1b integrally formed with the base plate 1a and having open front and rear surfaces. An arm 1c having a lock claw 1 d projects from the lower inner surface of the box portion 1b into a hollow portion 1f of the box portion 1b and guide ribs 1g are provided on the lower inner surface . On the other hand, the bracket 4 includes a vertical portion 4a having its bottom end secured to the vehicle body 3 and a horizontal portion 4b projecting from the leading end of the vertical portion 4a. The horizontal portion 4b is in the form of a frame as shown in FIG. 5 and is formed with a lock hole 4c in its upper surface. When the clamp 1 is locked with the bracket 4, the horizontal portion 4b of the bracket 4 is inserted into the box portion 1b of the clamp 1 through its open front surface by being guided by the guide ribs 1g and the lock claw 1d at the leading end of the arm 1c of the clamp 1 is inserted into the lock hole 4c of the bracket 4 from above. In order to lock the clamp 1 and the bracket 4 as above, height H of the hollow portion 1f of the box portion 1b of the clamp 1 is set according to thickness t of the bracket 4. In other words, the bracket 4 cannot easily be fitted and locked if the height H of the hollow portion 1f is smaller than a suitable set value, whereas a locking force is weak if the height H is larger than the suitable set value. However, the thickness t of the bracket 4 is set based on the size (weight) of the wiring harness W/H or other factor to ensure a satisfactory holding strength, in other words, the thickness t varies. Thus, it is necessary to change the height H of the hollow portion 1f of the box portion 1b according to the thickness of the bracket 4. The use of brackets of a specified thickness constantly requires one corresponding kind of clamps. This disadvantageously leads to the preparation of a multitude of kinds of clamps. In order to overcome the above problem, an object of the present invention is to provide a clamp which can be commonly used for brackets having different thicknesses. This object is solved according to the invention by a bracket locking clamp according to claim 1. Preferred embodiments of the invention are subject of the dependent claims. According to the invention, there is provided a bracket locking clamp, comprising a base plate to be fixed to a wiring harness, a box portion integrally or unitarily formed with the base plate, and a locking means, the clamp being adapted to lock a bracket by inserting the bracket into a hollow portion of the box portion and locking it with the lock means, wherein one or more thickness take-up (or adapting) portions are formed in one or more side walls of the box portion, wherein the one or more thickness take-up portions are deformable when a force acts on a limiting wall of the box portion thereby increasing the height of the box portion Accordingly, the thickness take-up portions can extend to enable the insertion of the bracket into the hollow portion in the case that the bracket to be inserted into the hollow portion of the box portion is thick or thicker than the height of the hollow portion with the thickness take-up portions in the undeflected or not elongated state. According to a preferred embodiment of the invention, the thickness take-up portions are formed by thinned and/or elastically deformed portions of the one or more side walls. Accordingly, the thickness take-up portions can easily elongate or deform thus allowing for an easy or smooth insertion of the bracket into the hollow portion. Preferably, the thickness take-up portions are bulging in a direction at an angle different from 0° or 180°, preferably substantially normal to the corresponding side walls. Accordingly, the thickness take-up portions can be easily manufactured. Most preferably, the thickness take-up portions are bulging in a direction substantially away from the hollow portion of the box portion. According to a further preferred embodiment, there is provided a bracket locking clamp, comprising a base plate to be fixed to an automotive wiring harness by taping, a box portion integrally formed with the base plate, and an arm with a lock claw at the leading end which projects from the inner surface of the box portion into a hollow portion of the box portion, the clamp being adapted to lock a bracket projecting from a vehicle body by inserting the bracket into the hollow portion of the box portion and inserting the lock claw into a hole formed in the bracket, wherein thinned and elastically deformed thickness take-up portions are formed in the opposite side walls of the box portion for extending to enable the insertion of the lock claw into the hole of the bracket in the case that the bracket being inserted into the hollow portion of the box portion is thick. If the thinned and elastically deformed thickness take-up portions are formed in the opposite side walls of the box portion as described above, they extend in the case that the bracket being inserted into the hollow portion of the box portion, thereby enabling the lock claw to be inserted and locked in the hole of the bracket. In the case of a thin bracket, the lock claw is locked in the hole of the bracket without the thickness take-up portion extending. Although the thickness take-up portions extend when the bracket is pushed into the hollow portion, they are held elastically deformed when no external force acts. Preferably, the locking means comprises an arm with a lock claw at the leading end which projects at least partially from the inner surface of the box portion into a hollow portion of the box portion and wherein the bracket is locked by inserting the lock claw into a hole formed in the bracket. Further preferably, the box portion comprises at least one bevelled portion, preferably at a front portion thereof with respect to an insertion direction of the bracket into the hollow portion of the box portion. Accordingly, the bracket can be smoothly inserted even if its thickness is higher or larger than the height of the hollow portion, since the bevelled portions allow for a smooth displacement of the limiting wall of the box portion thus deforming or elongating the thickness take-up portion(s). Still further preferably, the bevelled portion is provided on the limiting wall of the box portion. Most preferably, the box portion comprises one or more guide grooves for guiding one or more walls, preferably side walls of the bracket upon its insertion. Accordingly, the wedging of the bracket in the hollow portion can be effectively prevented, thus increasing the handling or manipulation of the bracket locking clamp. These and other objects, features and advantages of the present invention will become more apparent upon a reading of the following detailed description and accompanying drawings in which: FIG. 1 (A) is a perspective view of a clamp according to one embodiment of the invention and FIG. 1(B) is a section along B-B of FIG. 1(A), FIG. 2 is a section showing a locked state of the clamp with a bracket, FIGS. 3(A) and 3(B) are schematic diagrams showing a relationship between the thickness of the bracket and the clamp, FIG. 4 is a perspective view showing a relationship between a bracket and a prior art clamp, FIG. 5 is a perspective view of the prior art clamp, and FIG. 6 is a schematic diagram showing a locked state of the prior art clamp with the bracket. Hereafter, one embodiment of the invention is described with reference to the accompanying drawings. As shown in FIGS. 1(A) and 1(B), similar to the prior art clamp, a clamp 10 according to the invention which is made e.g. of resin includes a base plate 11 to be fixed to a wiring harness by taping clips or the like fixing means and a box portion 12 integrally or unitarily formed with the base plate 11, and an arm 13 having a downward facing lock claw 13a at its leading end substantially projects from a rear part of the lower inner surface of the box portion 12 into a hollow portion 14 of the box portion 12. The box portion 12 has openings 12a, 12b in its front and rear surfaces, respectively. Upper and lower walls 12c, 12d of the box portion 12 are thickened so as to have an increased rigidity, whereas lateral or left and right side walls 12e, 12f thereof are formed in their middle positions with height or thickness take-up or adapting portions 15 which are thinned and elastically deformed preferably outward. The thickness take-up portions 15 are elastically deformed outward as shown in FIG. 1 during the molding of the clamp 10 and formed such that the height thereof is smaller than that of the box portion 12. By being formed as above, the thickness take-up portions 15 do not extend unless a specified or predetermined or predeterminable external force acts thereon. In other words, the thickness take-up portions 15 correspond to portions of the lateral or side walls 12e, 12f, which are deformed or bulge in a direction at an angle different from 0° or 180° with respect to a plane of the lateral walls 12e, 12f and is preferably thinned so as to have an increased flexibility or elasticity. Accordingly, the thickness take-up portions 15 can easily elongate or straighten or flatten so as to increase the longitudinal extension or height of the lateral walls 12e, 12f as will be described later in more detail. Further, at the front ends of the upper and lower walls 12c, 12d forming the upper and lower edges of the front opening 12a of the box portion 12 are formed bevelled portions 12g, 12h to facilitate the insertion of a bracket 4 (FIG. 2) projecting e.g. from a vehicle body. The lower wall 12d is formed with guide grooves 12i, 12k at the opposite sides thereof for slidably guiding left and right walls 4b-1, 4b-2 of the horizontal portion 4b of the bracket 4. An upper wall 4b-3 in which a hole 4c of the horizontal portion 4b is formed is inserted or insertable between the lower wall 12d and the upper wall 12c. A spacing between the upper and lower walls 12c and 12d (i.e. height H of the hollow portion 14 of the box portion 12) needs at least to correspond to thickness t of the upper wall 4b-3 of the bracket 4. The bracket 4 which projects from the vehicle body and is to be locked with the clamp 10 has the same configuration as the one according to prior art, as shown in FIGS. 4 and 5. Specifically, the bracket 4 includes a vertical portion 4a having its bottom end secured to the vehicle body 3 and a horizontal portion 4b projecting from the leading end of the vertical portion 4a. The horizontal portion 4b is comprised of left, right and upper walls, and the hole or recess 4c is formed in the upper wall. In the case of thin (1.2 mm) bracket 4 as shown in FIG. 3(A), the height H of the hollow portion 14 of the box portion 12 of the clamp 10 substantially corresponds to the thickness t with the thickness take-up portions 15 of the left and right side walls of the box portion 12 elastically deformed outward. The horizontal portion 4b of the bracket 4 is inserted into the box portion 12 without extending or straightening the thickness take-up portions 15, and the lock claw 13a inside the box portion 12 can be smoothly inserted and locked in the hole 4c. In this state, the lock claw 13a is not disengaged from the hole 4c. In the case of the thick (2.6 mm) bracket 4 as shown in FIG. 3(B), the horizontal portion 4b is forcibly inserted into the hollow portion 14 in an insertion direction A since the height H of the hollow portion 14 is smaller than the thickness t. During this time, the horizontal portion 4b can be easily inserted into the hollow portion 14 since the bevelled portions 12g, 12h are formed at the upper and lower edges of the opening 12a. When the horizontal portion 4b is pushed into the hollow portion 14, the thickness take-up portions 15 at the opposite sides of the box portion 12 extend, permitting the insertion of the horizontal portion 4b so that the lock claw 13a can be locked in the hole 4c. In other words, in case the height H of the hollow portion 14 is substantially less than the thickness t of the bracket 4 to be inserted, the thickness take-up or adapting portions 15 elongate or their bulges are straightened thus increasing the height H to at least the thickness t of the bracket 4 and thus allowing to accommodate the bracket 4 at least partially in the hollow portion 14. As is clear from the above description, in the case of the thick bracket, the thickness take-up portions of the clamp extend to enable the locking of the clamp with the bracket according to the invention. Accordingly, even in the case of thick brackets, it is not necessary to provide separate corresponding clamps. The clamp can be commonly used for thin and thick brackets and it is not necessary to prepare a multitude of kinds of clamps. Thus, the number of parts can be reduced. Further, since it is not necessary to distinguish kinds of clamps to be mounted on a wiring harness, the wiring harness can be more easily assembled. LIST OF REFERENCE NUMERALS 3 Vehicle Body 4 Bracket 4b Horizontal Portion 4c Hole 10 Clamp 11 Base Plate 12 Box Portion 13 Arm 13a Lock Claw 14 Hollow Portion 15 Thickness Take-Up Portion

Claims: A bracket locking clamp (10), comprising a base plate (11) to be fixed to a wiring harness (W/H), a box portion (12) integrally or unitarily formed with the base plate (11), and a locking means (13; 13a), the clamp (10) being adapted to lock a bracket (4) by inserting the bracket (4) into a hollow portion (14) of the box portion (12) and locking it with the lock means (13; 13a), characterised in that one or more thickness take-up portions (15) are formed in one or more side walls (12e; 12f) of the box portion (12), whereby the one or more thickness take-up portions (15) are deformable when a force acts on a limiting wall (12c) of the box portion (12) thereby increasing the height of the side walls (12e; 12f) and thus the height (H) of the hollow portion (14) of the box portion (12). A bracket locking clamp according to claim 1, wherein the thickness take-up portions (15) are formed by thinned and/or elastically deformed portions of the one or more side walls (12e; 12f). A bracket locking clamp according to one or more of the preceding claims, wherein the thickness take-up portions (15) are bulging in a direction at an angle different from 0° or 180°, preferably substantially normal to the corresponding side walls (12e; 12f). A bracket locking clamp according to claim 3, wherein the thickness take-up portions (15) are bulging in a direction substantially away from the hollow portion (14) of the box portion (12).

Inventors: SUGIYAMA MASASHI, SUGIYAMA, MASASHI
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1998
Main classification: B60R16
IPC codes: H02G3, F16L3, B60R16