Patent US4580386A successfully refreshed from Google Patents.
US4580386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion clip on a ceiling runner
Assignee: Armstrong World Industries Inc
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Filing: 1981-12-14
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Granted: 1986-04-08
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Expires: 2001-12-14
Abstract
Abstract The invention provides a slot in the runner and lugs on a clip to allow sliding contact between the runner and the clip. This allows for expansion of the runner during a fire condition. The clip is fastened to the vertical web of an adjacent runner to fasten the runner structures together. Normally, a clip is provided on each end of one runner structure and it is mounted between two rigidly positioned other runner structures and the runner with the clips is capable of expansion and contraction under fire conditions without buckling.
Inventors
- 👤 John M. Hemphill
- 👤 Ernest B. Nute, Jr.
- 👤 Daniel C. Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:45
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/06; E04B9/064; E04B9/08; E04B9/12; E04B9/127; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7001
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A runner for a suspended ceiling system comprising: (a) a runner of inverted T-shape having both ends formed with the same configuration, (b) the configuration on the ends of the runner being an elongated slot, (c) a connecting member having a two-part structure with one part being disposed at a 90° angular relationship to the other part, (d) said one part having a means for engaging said elongated slot of said runner and being freely slidable in said slot, (e) the other part of said connecting member having a means for engaging the vertical web of a second runner which is disposed at a 90° angular relationship to said first mentioned runner, (f) said connecting member being on both ends of said runner, and (g) said elongated slot has an enlarged end into which said engaging member on said connecting member is inserted whereby subsequential sliding movement of said engaging means into the narrow portion of the elongated slot will lock together said runner and connecting means.
Claim 2
Dependent Claim
167 words
A runner for a suspended ceiling system comprising: (a) a runner of inverted T-shape having both ends formed with the same configuration, (b) the configuration on the ends of the runner being an elongated slot, (c) a connecting member having a two-part structure with one part being disposed at a 90° angular relationship to the other part, (d) said one part having a means for engaging said elongated slot of said runner and being freely slidable in said slot, (e) the other part of said connecting member having a means for engaging the vertical web of a second runner which is disposed at a 90° angular relationship to said first mentioned runner, (f) said connecting member being on both ends of said runner, and (g) said elongated slot has an enlarged end into which said engaging member on said connecting member is inserted whereby subsequential sliding movement of said engaging means into the narrow portion of the elongated slot will lock together said runner and connecting means.
Claim 3
Dependent Claim
71 words
The runner of claim 1 wherein said engaging means is formed of two right angle lugs disposed facing away from each other, each lug has a first part perpendicular to the body of said connecting member and on the end thereof a second part parallel with the body of said connecting member to define a channel therebetween, said channel being between the body of said connecting member and said second part.
Claim 4
Dependent Claim
89 words
The runner as set forth in claim 2 wherein said enlarged end of said elongated slot is wide enough to receive the lugs of the connecting member whereby the edges of said slot are disposed above said lug channels, with the other portion of the elongated slot being of a width less than the enlarged end so that the edges of said slot in its narrow region fit into said channels to hold the connecting member to the runner, but permit sliding of the connecting member on the runner.
Claim 5
Dependent Claim
36 words
The runner of claim 3 wherein said means for engaging the vertical web of a second runner is an inverted U-shape structure that laps over the top of the vertical web and is frictionally held thereto.
References Cited (Backward Citations)
US2351127A
Cited
US3175655A
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US3294428A
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US3722933A
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US3898782A
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US4011707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |