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Suspended ceiling grid structure
| Details |
Inventors: Platt, William J.;
Assignee: National Rolling Mills Inc. (Malvern, PA)
Primary Examiner: Pate, III; William F.
Assistant Examiner: Smith; Creighton
Attorney, Agent or Firm: Earley; John F. A., Earley, III; John F. A.
In a suspended ceiling grid structure adapted to support ceiling tiles or the like, connecting apparatus between ceiling grid inverted T main and cross members disposed at right angles to each other and having upright central fins and bottom horizontal flanges comprise a vertically disposed belt loop formed in the central fin of the main member, a locking tongue extending from each end of the cross members in opposite directions at substantially right angles from the central fin of the cross member, a stiffening bead formed in the central fin of the cross member at each end of the cross member and extending through the locking tongues to an outer end portion of the locking tongues, a locking bump formed in the stiffening bead in the outer end portion of the locking tongues, positive stop shoulders at the top and bottom of the locking tongue contacting the rear edge of the belt loop on the main member when the locking tongue is fully inserted into the belt loop, and a sloping surface on the rear of the locking bump which the loop presses against to urge stop shoulders against the rear edge of the belt loop. |
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DETAILED DESCRIPTION Turning now to the drawings, there is shown a suspended ceiling grid structure 11 adapted to support ceiling tiles or the like, which comprises a plurality of main beams 15 arranged in spaced-apart, substantially parallel relationship, and cross tees 17 which connect the adjacent main beams 15 together.
Each main beam 15 has an inverted T shape, and includes a central fin or web 21 having a reinforcing bead 23 at the top and a pair of oppositely disposed flanges 25 at the bottom.
A capping 27 is mounted on flanges 25.
Pairs of vertically disposed belt loops 29, 29a are formed in the central fin 21 of main beam 15 with one belt loop 29 of each pair being formed on one side of main beam fin 21 and the other loop 29a of each pair being formed on the opposite side.
Cross tees 17 are also of inverted T construction and each includes a central fin or web 31, a reinforcing bead 33 at the top of central fin 31, flanges 35 extending from the bottom of central fin 31, and a capping 37 mounted on flanges 35.
Locking tongues 39, 41 are formed integrally with each cross tee 17 and extend in opposite directions from each end of cross tee 17 at substantially right angles to cross tee central fin 31.
A stiffening bead or rib 43 is formed in the central fin 31 at each end of cross tee 17 and extends through the central portion of locking tongues 39, 41 to an outer end portion of locking tongues 39, 41.
Ribs 43 are provided to strengthen the ends of cross tees 17 and locking tongues 39, 41.
A locking bump 45 is formed in the outer end portion of each rib 43, and has an entrance ramp or forward surface 45a which slopes rearwardly and outwardly from the fin of the tongue, and a rear surface 45b that slopes rearwardly toward the fin.
Belt loop 29, 29a presses against rear surface 45b to urge the locking tongues 39, 41 into tight engagement, since the belt loops 29, 29a tend to spring back and to ride down the sloped surface 45b of locking bump 45.
Since the rear surface 45b of locking bump 45 is sloped, the tongues may be removed from belt loops 29, 29a without causing damage to the cross tee 17 by sliding the locking tongues 39, 41 rearwardly out of the belt loops 29, 29a
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Liquid Purification 
