| 摘要 |
<p>For use in a suspended ceiling system a pair of beams joinable end to end in aligned relation, each of the beams having a vertical web and lower flange at right angles thereto. The beams have identically formed end portions each terminating in a horizontal tongue integral with the web. Each web has formed therein a window having an inwardly spaced "locking" edge and having a vertical dimension just slightly greater than the height of the tongue. Each of the tongues is notched and bent along its upper and lower edges to form a pair of integral hooks. The tongues are sufficiently straight with respect to the plane of the web so that when a tongue is received in the window of the companion beam it bears with resilient lateral force against the far edge of the window, insuring that the hooks "catch" behind the locking edge to a desired depth. The tongues may be withdrawn from the windows by a force applied at an angle having a lateral component in a direction to bendingly stress the tongues for disengagement of the hooks. The far edge of each window is formed with an integral tang bent convergently from the plane of the web to engage the tip of an inserted tongue to guide the same into the window, the tang optionally serving as a positive lock.</p> |
