Patent Application
20130318905
The invention relates to suspended ceiling systems and, in particular, to a novel yoke for suspending a pair of main runners in parallel relation.
Certain ceiling treatments or designs utilize main runners or tees in relatively closely spaced pairs to give a ceiling a distinctive appearance and/or to provide an intermediate space for lighting, HVAC systems, sprinkler systems, and like services. It is known to use inverted U-shaped brackets or yokes to support a pair of main runners in close parallel relation. Such brackets, typically, are suspended in the customary manner that the remainder of the suspension grid is carried. Prior art yoke designs involve somewhat tedious installation procedures and/or are limited to single channel widths.
The invention provides an improved yoke for spacing main runners in a suspended ceiling grid to form relatively narrow utility channels. The yoke includes mounting tabs that are arranged to be received in the cross runner slots existing in the main runners. The mounting tabs afford quick initial mounting of the main runners without tools, clamps and other instrumentalities. The yoke includes a catch that allows a runner to be received on the tab when the runner is twisted about its length and resists release of the runner from the tab when the runner is allowed to assume a normal orientation.
In its preferred embodiment, the yoke is assembled from two identical pieces. The pieces are lapped and screwed together by the installer. The two piece construction enables the yoke to be adjustable to the desired channel width between the main runners. The disclosed yoke, besides simplifying the installation of main runners for the tradesman, offers benefits to a manufacturer, distributors and contractors. One yoke fits commonly used utility channel sizes. Thus, inventory is greatly simplified for those engaged in the supply chain or is a contractor.
and
A yoke 10 shown in
The yoke 10 is used with additional identical yokes spaced along the length of the main runners 11 which length, typically, is 12 ft. The yoke 10 has the general shape of an inverted U with an upper horizontal span 16 and depending legs 17 adjacent the ends of the span. As later indicated, the spacing between the legs 17 determines the relative spacing between the main runners 11.
Preferably the yoke 10 is an assembly of two identical parts 21. A part 21 is generally L-shaped, i.e. its shape is primarily that of a right angle. Ideally, the part 21 is stamped of sheet metal, usually galvanized steel. A major portion of the part 21 remains planar. An upper arm 22 of the part 21 is generally flat, apart from a narrow flange 23 along its upper edge at a right angle to the plane of the arm proper. A parallel series of spaced small and large holes 24, 25 are punched along the length of the arm 22.
Adjacent a lower end 26, the leg 17 includes a tab 27 projecting in parallel to the overlying arm 22. At a vertical line 28 where the tab 27 merges with the lower end 26 of the leg 17, a hole 29 is stamped to weaken the part for purposes of enabling and controlling manual bending of the tab as will be discussed. The tab 27 has a vertical height and a thickness enabling it to be received in a cross runner slot 31 in a web 32 of a main runner 11 while leaving sufficient room in the slot for a connector 33 of a cross runner 34. The leg 17, above the tab 27, has an offset portion 36 that lies in a vertical plane horizontally displaced from the plane of a major part of the leg that exists above this portion. It will be seen from
Spaced above the tab 27, the leg 17 has a portion bent into a transverse plane and forming a catch or hook 41. A vertical edge of the leg 17 is bent to form a small stiffening flange 42.
A main runner 11 is installed on a yoke 10 by holding the runner between the legs 17 and twisting it about its longitudinal axis so that the reinforcing bulb, designated 51 at the top of the runner is tilted toward the side of the yoke to which it is to be mounted. With the runner 11 tilted, the bulb 51 is slipped under the catch 41. With a cross runner slot 31, aligned with a tab 27, the runner is turned upright so that the tab enters and extends through the cross runner slot. At this stage, at least the local section of the main runner 11 is fully supported on the respective yoke 10. It will be appreciated that this mounting is accomplished without the use of tools or fixtures. The tab 27 can be manually bent back against the web 32 of the main runner 11 (to the left in
Once a main runner 11 is installed on a number of yokes 10, cross runners can be assembled on it. The other main runner 11 to be assembled on a yoke can be installed before or after cross runners 34 are installed on the first placed main runner 11. At some point, typically before any nearby ceiling panels are installed, the tabs 27 can be secured to main runner webs 32 with screws run through tab holes 53. Likewise, screws can fix the legs 17 to the cross runner webs 38 at the provided holes 39 and to the cross runner reinforcing bulb at selected ones of the provided holes, designated 54.
When the yokes 10 associated with a pair of main runners 11 are secured to the main runner webs 32 and the cross runner webs 38 and reinforcing bulbs 37 with fasteners in the provided holes, a relatively rigid structure results. The rigidity is very helpful to the installer when uneven loads are imposed on a suspended grid and forces tend to distort it out of a plane. This phenomena, when using prior art yokes, hindered the installer and often required him to reset the grid. The slim profile of the yoke 10, seen in
It should be evident that this disclosure is by way of example and that various changes may be made by adding, modifying or eliminating details without departing from the fair scope of the teaching contained in this disclosure. The invention is therefore not limited to particular details of this disclosure except to the extent that the following claims are necessarily so limited.
