# Patent

## Title
Strut and clip assembly for stiffening a hanger rod

## Abstract

The present invention is a clip for use with a strut that at least partially surrounds a hanger rod for the purpose of providing stiffness to the hanger rod. The clip includes a handle portion, a rod-clamping portion, and a fulcrum spaced away from the handle portion. The fulcrum is for being mounted to the strut. The rod-clamping portion is for forcing the hanger rod into tight engagement with an engagement surface of the strut in response to the handle being actuated to an operational position. The present invention also relates to a hanger rod stiffening system that uses a clip and a strut, whereby a handle of the clip is actuated to force a rod-clamping portion of the clip into tight engagement with an internal surface of the strut.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of and priority to U.S. Provisional Patent Application No. 62/066,964 titled “Strut and Clip Assembly For Stiffening a Hanger Rod,” filed Oct. 22, 2014, which is incorporated herein by reference in its respective entirety.


COPYRIGHT
A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever.
FIELD OF THE INVENTION
The present invention relates generally to hanger rods used in building construction. Specifically, it relates to an assembly that uses a manually actuated clip to stiffen a hanger rod.
BACKGROUND OF THE INVENTION
A hanger rod is part of a hanger assembly wherein one end of a threaded rod is vertically attached to the building structure, such as a concrete slab or a wood or steel beam. The other end has an attachment mechanism such as a yoke with a supporting structure, which is used to support building components (e.g., water pipes, HVAC ducts, cables, and electrical conduits) at a position relative to the concrete slab or beam. While hanger rods can be provided in any diameter, the typical size is either 3⁄8, 1⁄2, 5⁄8, 3⁄4, 7⁄8, 1 or 11⁄4 inches, depending on the structure that is to be supported. The lengths can be selected as needed for the particular construction project. Generally, a hanger rod is less than about 120 inches in length.
While these hanger rods are strong enough to support the various building components attached thereto, various assemblies and methods have been proposed to strengthen the hanger rod against deformation due to unusual stresses that may be experienced within the building, such as movement associated with an earthquake. Some devices make use of a stiffening member, such as a channel strut, angle iron, or pipe that is positioned substantially parallel to the hanger rod. One type of connection between the stiffening member and the hanger rod can be provided by welding the member to the rod, which is extremely time-consuming and not practical due to the expense involved. In another type of connection, the stiffening member and the hanger rod are connected in their parallel arrangement by a series of clamping devices by use of several manually driven fasteners, such as screws. Again, connection via fasteners can be a time-consuming process.
To keep installation costs down, there is a continuing need for stiffening assemblies for hanger rods that are simple to use, easy to make, and require minimal manual effort for installation. The present invention helps to satisfy this market need.
SUMMARY OF THE INVENTION
In one aspect, the present invention is a stiffening system for a hanger rod. The stiffening system includes a strut and a clip. The strut at least partially surrounds the hanger rod and extends along a length of the hanger rod. The strut includes an internal engagement surface adjacent to the hanger rod, and also a pivot region. The clip has a handle portion, a rod-clamping portion, and a fulcrum spaced away from the handle portion. The fulcrum pivotably engages the pivot region of the strut. The rod-clamping portion forces the hanger rod into tight engagement with the internal engagement surface of the strut in response to a pivoting movement about the fulcrum caused by the handle being actuated to an operational position.
In another aspect, the present invention is a clip for use with a strut that at least partially surrounds a hanger rod for the purpose of providing stiffness to the hanger rod. The clip includes a handle portion, a rod-clamping portion, and a fulcrum spaced away from the handle portion. The fulcrum is for pivotable engagement within the strut. The rod-clamping portion is for forcing the hanger rod into tight engagement with an engagement surface of the strut in response to the handle being actuated to an operational position.
In other aspect, the present invention is a clip for use with a strut that at least partially surrounds a hanger rod for providing stiffness to the hanger rod. The clip comprises a handle portion, a rod-clamping portion, and a fulcrum for being rotatably engaged within a pivot region of the strut. The rod-clamping portion forces the hanger rod into tight engagement with an engagement surface of the strut in response to the handle portion being moved to an operational position as the clip rotates around the fulcrum.
In other aspects, the present invention also involves methods for using a clip in conjunction with a strut that at least partially surrounds a hanger rod. Within the methods, a handle of the clip is actuatable by the user to wedge a rod-clamping portion of the clip between the hanger rod and the internal surface of the strut. Alternatively, the method may include actuating a handle of the clip by the user to sandwich the hanger rod between a rod-clamping portion of the clip and an internal rod-engaging surface of the strut.
The invention is also a method of stiffening a hanger rod, comprising (i) inserting the hanger rod into an elongated opening of a strut, (ii) inserting a rod-clamping portion of a clip into the elongated opening of the strut, (iii) moving a handle portion of the clip located external to the strut so as to engage a fulcrum of the clip against an internal surface of the strut, and (iv) rotating the handle portion of the clip toward the strut while the fulcrum is engaged against the internal surface of the strut to wedge the rod-clamping portion between the hanger rod and the internal surface of the strut.
In a further aspect, the invention is a method of stiffening a hanger rod, comprising, (i) inserting the hanger rod into an elongated opening of a strut, (ii) inserting a rod-clamping portion of a clip into the elongated opening of the strut, (iii) moving a handle portion of the clip located external to the strut so as to engage a fulcrum of the clip against an internal surface of the strut, (iv) rotating the handle portion of the clip toward the strut while the fulcrum is engaged against the internal surface of the strut to sandwich the hanger rod between the rod-clamping portion and an internal rod-engaging surface of the strut.
In yet another aspect, the present invention is a method of stiffening a hanger rod, comprising, (i) inserting the hanger rod into an elongated opening of a strut, (ii) inserting a rod-clamping portion of a clip into the elongated opening of the strut, and (iii) actuating a handle portion of the clip located external to the strut to sandwich the hanger rod between the rod-clamping portion and an internal rod-engaging surface of the strut.
Alternatively, the present invention is A method of stiffening a hanger rod, comprising, (i) inserting the hanger rod into an elongated opening of a strut, (ii) inserting a rod-clamping portion of a clip into the elongated opening of the strut, and (iii) actuating a handle portion of the clip located external to the strut to wedge the rod-clamping portion between the hanger rod and the internal surface of the strut.
In a further aspect, the invention is a method of stiffening a hanger rod, comprising, (i) inserting the hanger rod into an elongated opening of a strut, (ii) inserting a plurality of clips into the elongated opening of the strut, each of the plurality of clones being spaced away from each other, and (iii) actuating handle portions of each of the plurality of clips to clamp the hanger rod against an internal surface of the strut.
Additional aspects of the invention will be apparent to those of ordinary skill in the art in view of the detailed description of various embodiments, which is made with reference to the drawings, a brief description of which is provided below.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A is a top view of a clip and strut assembly for stiffening a hanger rod according to one embodiment of the present invention.
FIG. 1B is a side cross-sectional view of the clip and strut assembly of FIG. 1A.
FIG. 2A is a top view of a clip and strut assembly for stiffening a hanger rod according to another embodiment of the present invention.
FIG. 2B is a side cross-sectional view of the clip and strut assembly of FIG. 2A.
FIG. 3A is a top view of a clip and strut assembly for stiffening a hanger rod according to yet another embodiment of the present invention.
FIG. 3B is a side cross-sectional view of the clip and strut assembly of FIG. 3A.
FIG. 4A is a front view of a clip for stiffening a hanger rod according to a further embodiment of the present invention.
FIG. 4B is a top view of the clip of FIG. 4A.
FIG. 4C is a side view of the clip of FIG. 4A.
FIG. 4D is a cross-sectional view of the clip taken along line 4D-4D of FIG. 4C.
FIG. 4E is a side cross-sectional view of the clip of FIG. 4A taken along a center line of the clip.
FIG. 4F is a first perspective view of the clip of FIGS. 4A-4E.
FIG. 4G is a second perspective view of the clip of FIGS. 4A-4E.
FIG. 5 illustrates a hanger rod within the strut.
FIG. 6 illustrates the hanger rod of FIG. 5 being secured to strut by use of the clip of FIGS. 4A-4G.
FIG. 7A is a top view of a clip and strut assembly for stiffening two sizes of hanger rods according to yet a further embodiment of the present invention.
FIG. 7B is an alternative top view of the clip and strut assembly of FIG. 7A.
FIG. 7C is a side cross-sectional view of the clip and strut assembly of FIGS. 7A-7B.
FIG. 8 is a stamped piece of metal that can be formed into the clip illustrated in FIGS. 7A-7C.
FIG. 9A is a perspective view of a clip for stiffening a hanger rod according to yet another embodiment of the present invention.
FIG. 9B is a second perspective view of the clip of FIG. 9A.
FIG. 9C is an end view of the clip of FIG. 9A.
FIG. 10A is a top view of the clip of FIG. 9 that is assembled in the strut, and used with a first hanger rod size.
FIG. 10B is a perspective view of the clip and strut assembly of FIG. 10A.
FIG. 10C is a side cross-sectional view of the clip and strut assembly of FIG. 10A.
FIG. 10D is another top view of the clip of FIG. 9 that is assembled in the strut, and used with a second hanger rod size relative to the hanger rod size in FIGS. 10A-10C.



While the invention is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
DETAILED DESCRIPTION
While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will herein be described in detail preferred embodiments of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to the embodiments illustrated. For purposes of the present detailed description, the singular includes the plural and vice versa (unless specifically disclaimed); the words “and” and “or” shall be both conjunctive and disjunctive; the word “all” means “any and all”; the word “any” means “any and all”; and the word “including” means “including without limitation.”
Referring to FIGS. 1A and 1B, a hanger rod 10 is located within an elongated channel-type strut 20 that has an opening for receiving the hanger rod 10. The hanger rod 10 is typically part of a hanger assembly such that one end of the hanger rod 10 is vertically attached to a building structure (e.g., a concrete slab or a beam) and a connecting member is threadably coupled to the hanger rod 10 for supporting an additional building component, such as a water pipe. The strut 20 has a first wall 22, a second wall 24, and a third wall 26. The opening on the strut 20 that initially receives the hanger rod 10 is opposing the second wall 24. The second wall 24 includes an internal rod-engagement surface against which the hanger rod 10 is clamped by a clip 30. On either side of and adjacent to the opening in the strut 20, the strut 20 includes a pair of clip-engagement surfaces 28 that act as the strut's pivot region for a fulcrum portion of the clip 30, as described in more detail below. Accordingly, the hanger rod 10 is at least partially surrounded by the channel-type strut 20.
The clip 30 includes a rod-clamping portion 32 that is located within the strut 20 and a handle portion 34 that is located external to the strut 20. The rod-clamping portion 32 is in a transverse orientation (e.g., generally perpendicular in the illustrated embodiments) relative to the handle portion 34, such that the clip 30 has generally an L-shaped configuration. The rod-clamping portion 32 includes an engagement surface 36 that is moved into position against and engages the hanger rod 10. The clip 30 also includes a fulcrum portion 38 that engages the pair of clip-engaging surfaces 28 located on the strut 20. As shown in FIG. 1A, the fulcrum portion 38 is part of the surface on the rod-clamping portion 32 that opposes the rod-engagement surface 36. The fulcrum portion 38 can also be located at other regions of the clip 30 that are spaced away from the manually actuatable handle portion 34 and, thus, can be outside the rod-clamping portion 32.
FIG. 1B illustrates two clips 30a and 30b into different positions on the strut 20. In particular, the lower clip 30a is in the “open” position, where it has been initially inserted into the strut 20 by manual operation from the user. When the clip 30 is in the open position, the clip 30 is moveable within the strut 20 along a length of the hanger rod 10 so that its final location on the hanger rod 10 can be selected by the user. In the open position, the handle portion 34 of the lower clip 30a extends away from the strut 20 as the rod-clamping portion 32 is inserted into the opening of the strut 20. The engagement surface 36 is located away from the hanger rod 10 when the clip 30a is oriented in the open position. As shown by the arrow “R” in FIG. 1A, the lower clip 30a pivots around the fulcrum portion 38, which itself is engaged against the clip engaging surfaces 28 of the strut 20, as a manual force is placed on the handle portion 34. The rotational movement causes the engagement surface 36 to move towards the hanger rod 10.
The upper clip 30b is in the “closed” or operational position as its handle portion 34 has been fully rotated towards the strut 20. The rotational movement of the clip 30b causes the engagement surface 36 to be forced against the hanger rod 10, such that the hanger rod 10 is clamped (sandwiched) between the engagement surface 36 of the rod-clamping portion 32 and an internal surface on the second wall 24 of the strut 20. In other words, the rotational movement of the handle portion 34 of the clip 30b causes the rod-clamping portion 32 of the clip 30 to be wedged between the internal surface 28 of the strut 20 (which is engaging the fulcrum 38 of the clip) and the hanger rod 10. When in the closed position, the assembly of the strut 20 and the clip 30 functions to stiffen the hanger rod 10 and resist buckling under compression forces, which may result from building movements caused by vibrations or earthquakes.
The present invention contemplates placing multiple clips 30 along the length of a single hanger rod 10, such that the clips 30 are generally spaced apart by a distance that is calculated in accordance with accepted engineering practice to provide the required resistance to buckling of the hanger rod 10 under a calculated compression loading, such as that experienced in earthquakes, by bracing the hanger rod 10 with the clips 30. Generally, the accepted engineering practice is to use the American Institute of Steel Construction buckling formula, Kl/r, where K is a variable representing the buckled shape of the hanger rod 10, l is the maximum spacing between clips 30, and r is the least radius of gyration of the hanger rod 10.
The strut 20 is typically a standard, commonly used strut for building construction. For example, one common strut 20 has cross-sectional dimensions of 15⁄8 inches by 15⁄8 inches. Because of the desire to wedge the rod-clamping portion 32 of the clip 30 between the internal surface 28 of the strut 20 and the rod 10, the dimensions of the rod-clamping portion 32 of the clip 30 and the location of the fulcrum 38 are dependent on the strut 20 to which the clamp 30 is to be assembled.
Turning now to FIGS. 2A and 2B, the hanger rod 10 and the channel-type strut 20 are shown relative to a different embodiment of a clip 130. It should be noted that structures and function of the clip 130 are similar to the general structures and functions of the clip 30 in FIGS. 1A and 1B (except for the differences noted below), and that 100-series reference numerals have been used in FIGS. 2A and 2B to delineate those similar structures (e.g., the handle portion 134 in the clip 130 in FIGS. 2A-2B is similar to the handle portion 34 in the clip 30 in FIGS. 1A-1B, etc.). In this embodiment, the engagement surface 136 of the rod-clamping portion 132 is located within a groove 137. While the groove 137 can have various shapes, the groove 137 is sized to receive a certain size of hanger rod 10 to provide some lateral frictional resistance when the clip 130 is in the closed position. In other words, the groove 137 receives a portion of the hanger rod 10 such that there are regions of the rod-clamping portion 132 located on either side of the hanger rod 10. The present invention contemplates having different clips 130 with different sized grooves 137 that can receive different diameters of hanger rods 10. For example, one size groove 137 on a first clip 130 may be useful for a few different diameters of hanger rods 10. And a second size groove 137 on a second clip 130 may be useful for other diameters of hanger rods 10.
Referring now to FIGS. 3A and 3B, the hanger rod 10 and the channel-type strut 20 are shown relative to a different embodiment of a clip 230. It should be noted that structures and function of the clip 230 are similar to the general structures and functions of the clip 30 in FIGS. 1A and 1B (except for the differences noted below), and that 200-series reference numerals have been used in FIGS. 3A and 3B to delineate similar structures (e.g., the handle portion 234 in the clip 230 in FIGS. 3A-3B is similar to the handle portion 34 in the clip 30 in FIGS. 1A-1B, etc.). In this embodiment, the clip 230 includes a smaller rod-clamping portion 232 that has a curved shape when viewed from the side, as shown in FIG. 3B. However, the rod-clamping portion 232 is still generally transverse to the handle portion 234. The fulcrum portion is located on a pair of rounded protrusions 238 that extend outwardly from the rod-clamping portion 232. Another difference is that the groove 237 on the rod-clamping portion 232 defines a curved rod-engagement surface 236. The radius of curvature of at least a portion of the curved rod-engaging surface of the groove 237 is approximately the same as a radius of curvature of the hanger rod 10. Due to the combination of the curved shape of the rod-clamping portion 232 and the curved rod-engagement surface 236 within the groove 237, the rod-clamping portion 232 slides upwardly along the hanger rod 10 as the handle portion 234 is rotated downwardly to the closed or operational position, such that different portions of the rod-engagement surface 236 come into engagement with the hanger rod 10 before the clip 230 reaches its final closed position.
Referring now to FIGS. 4A-4G, a different embodiment of a clip 330 for stiffening a hanger rod 10 is shown. It should be noted that structures and function of the clip 330 are similar to the general structures and function of the clip 30 in FIGS. 1A and 1B (except for the differences noted below), and that 300-series reference numerals have been used in FIGS. 4A-4G to delineate similar structures (e.g., the handle portion 334 in the clip 330 in FIGS. 4A-4G is similar to the handle portion 34 in the clip 30 in FIGS. 1A-1B, etc.). The rod-clamping portion 332 includes a groove 337 with a slightly concave, rounded engagement surface 336 for engaging the hanger rod 10. The fulcrum is located on surfaces of a pair of wing-shaped projections 338 extending outwardly from the rod-clamping portion 332, as shown best in the cross-sectional view in FIG. 4D, which is taken along line 4D-4D in FIG. 4C. Like the clip 230 of FIGS. 3A-3B, the rod-clamping portion 332 of the clip 330 has a rounded profile, as shown in the cross-sectional view of FIG. 4E, which is taken along the centerline of the clip 330. The handle portion 334 becomes wider to provide a larger surface for receiving a manual force from the user to actuate the clip 330 and move the clip 330 into its operational or closed position whereby it clamps the hanger rod 10 against an inner surface of the second wall 24 of the strut 20. The clip 330 can be formed by various processes, such as casting.
FIGS. 5-6 illustrate the clip 330 of FIGS. 4A-4G in use on an exemplary hanger rod 10 located within an exemplary channel-type strut 20. FIG. 5 illustrates the hanger rod 10 positioned against a rear internal surface of the strut 20. FIG. 6 illustrates the clip 330 in its operational position after the handle 334 has been moved downwardly against the strut 20. When the rotational movement of the handle 334 toward the strut 20 occurs, the clip 330 pivots around the fulcrum on the projections 338 (which are engaging internal surfaces of the strut 10 adjacent to the elongated opening of the strut 20), causing the rounded rod-engagement surface 336 to be force the hanger rod 10 against the rear internal surface of the strut 20.
Referring now to FIGS. 7A-7C, another embodiment of a clip 430 for stiffening a hanger rod 10 is shown. It should be noted that structures and function of the clip 430 are similar to the general structures and function of the clip 30 in FIGS. 1A and 1B (except for the differences noted below), and that 400-series reference numerals have been used in FIGS. 7A-7C to delineate similar structures (e.g., the handle portion 434 in clip 430 in FIGS. 7A-7C is similar to the handle portion 34 in the clip 30 in FIGS. 1A-1B, etc.). The clip 430 is somewhat asymmetric in that there are two different rod-engagement surfaces 436a and 436b having different sizes. The first rod-engagement surface 436a is configured to engage a first size of hanger rod 10a (FIG. 7A) such as a 1⁄2 inch diameter hanger rod, while the second rod-engagement surface 436b is configured to engage a second size of hanger rod 10b (FIG. 7B) such as 3⁄8 inch diameter hanger rod. As can be seen in FIGS. 7A and 7B, the first rod-engagement surface 436a clamps the hanger rod 10a in an upper corner defined by two internal surfaces of the strut 20, while the second rod-engagement surface 436b clamps the hanger rod 10b in a lower corner defined by two internal surfaces of the strut 20. Accordingly, the present invention also contemplates a single clip and strut assembly for independently stiffening multiple sizes of hanger rods by clamping those hanger rods at different locations within the strut 20. Thus, the clip 430 presents more of a modular design.
Additionally, the clip 430 includes a pair of registration tabs 439 near the pair of fulcrum portions 438. The pair of registration tabs 439 is for the purpose of maintaining the clip 430 in proper alignment and registration with the elongated opening of the strut 20. Each of the registration tabs 439 engages a corresponding surface that defines the opening of the strut 20 to help maintain the clip 430 in the proper horizontal orientation during insertion into the vertically oriented strut 20. The registration tabs 439 also maintain the proper orientation of the clip 430 during actuation of the handle 434 to transition the clip 430 into the closed position.
FIG. 8 illustrates one method that the clip 430 can be manufactured. Specifically, the clip 430 can be stamped from a piece of steel, and then bent into the final configuration that is shown in FIGS. 7A-7C. As one example, the clip 430 can be stamped from a flat piece of AISI 1008 or AISI 1010 zinc-plated steel having a thickness of between 0.15 and 0.25 inch. Each of the rod-engagement surfaces 436a and 436b can be formed by bending elongated tabs that extend outwardly from the main body of the rod-clamping portion 432. Similarly, the pair of registration tabs 439 can be bent from the clip 430 at regions that are adjacent to the rod-clamping portion 432. To create the transverse orientation between the handle 434 and the rod-clamping portion 432, the clip 430 can be bent around a primary bend line BL to an angle that is sufficient to allow the clip 430 to function in a manner that causes the hanger rod 10 to be forced into the corners of the strut 20, as shown in FIGS. 7A-7C.
FIGS. 9A-9C illustrate a clip 530 according to an embodiment of the present invention that is used for stiffening multiple sizes of hanger rods 10. It should be noted that structures and function of the clip 530 are similar to the general structures and function of the clip 30 in FIGS. 1A and 1B (except for the differences noted below), and that 500-series reference numerals have been used in FIGS. 9A-9C to delineate similar structures (e.g., the handle portion 534 in clip 530 in FIGS. 9A-9C is similar to the handle portion 34 in the clip 30 in FIGS. 1A-1B, the fulcrum portion 538 in clip 530 in FIGS. 9A-9C is similar to the fulcrum portion 38 in the clip 30 in FIGS. 1A-1B, etc.). The clip 530 is asymmetric in that there are two different rod-engagement surfaces 536a and 536b for engaging rods of different sizes, as will described below relative to FIGS. 10A-10D.
Additionally, the handle portion 534 of the clip 530 includes a locking portion 540 with a pair of latching fingers 542. The handle portion 534 is split into two sections via an elongated notch 544 that separates the pair of latching fingers 540. The elongated notch 544 is positioned along the central axis of the handle portion 534 so as to allow the latching fingers 540 to spring inwardly during insertion into the strut, which is shown in FIG. 10 below. The latching fingers 540 engage an inner surface of the strut 20 to help retain the clip 530 within the strut 20 as the clip 530 holds the hanger rod. Although not shown, the locking portion 540 may further include one or more holes that permit insertion of a tool (e.g., a screwdriver) that can twist the latching fingers 542 inwardly and overcome the spring force of the two sections of the handle portion 540 during removal of the clip 530 from the strut 20. The dimensions (width and length) of the elongated notch 544 are chosen to optimize the spring force associated with the handle portion 540.
As shown in FIGS. 10A-10C, the first rod-engagement surface 536a is configured to engage a first size of hanger rod 10a, such as a 1⁄2 inch diameter hanger rod. As can be seen best in FIG. 10A, the first rod-engagement surface 536a clamps the hanger rod 10a in a first corner defined by two internal surfaces of the strut 20. On the other hand, as show in FIG. 10D, in an alternative use, the second rod-engagement surface 536b clamps the smaller hanger rod 10b (e.g. 1⁄4 inch diameter hanger rod) in a second corner defined by two internal surfaces of the strut 20. Like the clip 430 of FIG. 7, the clip 530 presents more of a modular design, allowing for a single clip and strut assembly to independently stiffen multiple sizes of hanger rods by clamping those hanger rods at different locations within the strut 20.
FIGS. 10A-10D also illustrate the locking portion 540 of the clip 530 in use. During assembly, the pair of latching fingers 542 engage the inner walls of the strut 20 and are forced toward each other as the handle portion 534 is moved downwardly into the operational position. The dimensions of the clip 530 are chosen such that the handle portion 432 is substantially parallel to the longitudinal axis of the strut 20 as the latching fingers 542 clear the space of the inner walls of the strut 20 and resiliently snap outwardly to help lock the clip 530 in place along the strut 20. At this point, one of the engaging surfaces 536a or 536b is forcing the hanger rod 10A or 10B into tight engagement with the corners of the strut 20 and the final assembly process is complete. The locking portion 540 can also be applied to any of the designs of the previous clips described relative to FIGS. 1-8.
Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the claimed invention, which is set forth in the following claims. Moreover, the present concepts expressly include any and all combinations and subcombinations of the preceding elements and aspects.

## Claims

1. A stiffening system for a hanger rod, comprising:
a strut that at least partially surrounds the hanger rod and extends along a length of the hanger rod, the strut including an internal engagement surface adjacent to the hanger rod, the strut further including a pivot region; and
a clip having a handle portion, a rod-clamping portion, and a fulcrum spaced away from the handle portion, the fulcrum being pivotably engaged in the pivot region of the strut, the rod-clamping portion forcing the hanger rod into tight engagement with the internal engagement surface of the strut in response to a pivoting movement about the fulcrum caused by the handle being actuated to an operational position.

2. The hanger-rod stiffening system of claim 1, wherein the rod-clamping portion includes a groove for receiving the hanger rod.

3. The hanger-rod stiffening system of claim 2, wherein the rod-clamping portion has a curved engagement surface, the hanger rod moving across the curved engagement surface as the handle is actuated to the operational position, the groove defining the curved engagement surface.

4. The hanger-rod stiffening system of claim 1, wherein a body of the clip has a configuration that is generally in an L-shape, the handle portion being transverse to the rod-clamping portion.

5. The hanger-rod stiffening system of claim 1, wherein the fulcrum is located within the rod-clamping portion.

6. The hanger-rod stiffening system of claim 1, wherein the fulcrum is defined by first and second protruding surfaces extending away from each other, the first and second protruding surfaces engaging the pivot region of the strut.

7. The hanger-rod stiffening system of claim 1, wherein the actuation of the handle to the operational position causes the rod-clamping portion to be wedged between the hanger rod and the pivot region of the strut.

8. The hanger-rod stiffening system of claim 1, wherein the handle extends away from the strut in an insertion position when the clip is initially inserted into the strut.

9. The hanger-rod stiffening system of claim 8, wherein, in response to manual force on the handle, the handle is moved from the insertion position to the operational position that forces the hanger rod into tight engagement with the internal engagement surface of the strut.

10. The hanger-rod stiffening system of claim 1, wherein the clip further includes latching fingers to engage inner surfaces of the strut after the handle is actuated to the operational position.

11. The hanger-rod stiffening system of claim 1, wherein the latching fingers move toward each other as the handle is moved toward the operational position, the latching fingers resiliently spring outwardly onto the inner surfaces of the strut in response to the handle reaching the operational position.

12. The hanger-rod stiffening system of claim 1, wherein the rod-clamping portion includes a plurality of rod-engaging surfaces, the plurality of rod-engaging surfaces being selectively useful in providing tight engagement to multiple sizes of hanger rods within the strut.