US2896752A - Suspended ceiling grid construction - Google Patents
Suspended ceiling grid construction Download PDFInfo
- Publication number
- US2896752A US2896752A US584249A US58424956A US2896752A US 2896752 A US2896752 A US 2896752A US 584249 A US584249 A US 584249A US 58424956 A US58424956 A US 58424956A US 2896752 A US2896752 A US 2896752A
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- US
- United States
- Prior art keywords
- web
- loop
- members
- cross
- hook
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
- E04B9/12—Connections between non-parallel members of the supporting construction
- E04B9/127—Connections between non-parallel members of the supporting construction one member being discontinuous and abutting against the other member
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/34—Branched
- Y10T403/349—Coplanar
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/44—Three or more members connected at single locus
Definitions
- the primary object of this invention is to provide a novel means for interlocking the cross runners of the grid framework to the main carrying runners in a simplilied manner Vthat will reduce the time normally required for installation.
- Another object of this invention is to provide a connection between ceiling grid members having a positive locking connection between the grid members.
- a further object of this invention is to provide a connection between ceiling grid members having a positive locking connection between the grid members and which is capable of being manually disengaged from each other without deformation to either member or the connector mechanism to facilitate rearrangement of grid members, complete disassembly, or provide large openings for access to the area above the suspended ceiling.
- the novel connection between grid members is achieved by providing offset ears or loops on each side of the main runners at given intervals and providing slots of semi-keyhole shape for the reception of clips including hook-like portions having detents for insertion in said slots and that are securely fastened to the ends of the cross member.
- the clip at each end ⁇ of the cross member may be an integral part thereof but it "is preferred, however, to fabricate the clips separately to effect economy of material and simplicity in manufacture.
- Figure l is a fragmentary top plan view of a suspended grid ceiling with some of the ceiling panels installed;
- Figure 2 is an exploded view in perspective of the adjoining portions of the grid members and the connection therebetween;
- Figure 3 is a fragmentary'cross-sectional view taken on line 3 3 of Figure 2;
- Figure 4 is a cross-sectional view taken on line 4-4 of Figure 31;
- Figure 5 is a cross-sectional view taken on line 5 5 of Figure 2
- V Figure 6 is an enlarged fragmentary cross-sectional view similar to Figure 4 and illustrating two cross members connected to the main runner.
- a typical suspended ceiling comprises a grid construction formed by main runners 1 and cross members 2 connected to one another in continuous grid formation.
- These main runners 1 and the cross members 2 are of T-section and are positioned in inverted relation with their webs W disposed vertically and their flanges F beneath the webs and disposed horizontally.
- Ceiling panels P are mounted on the grid assembly with edges lnesting within the webs W of opposed runners and cross members and resting on the anges F thereof.
- the structure that is the cross-sectional conformation of the runners 1 and cross members 2 is substantially identical and preferably they are formed of strips 3 of sheet material which are bent to shape, as best shown in Figure 2.
- the strips 3 of sheet material are bent intermediate 'their longitudinal edges 7 and 9 in a right angle bend 4, the portion 'between the bend 4 and edge 7 forming the flange F, ⁇ and the portion between the bend 4 and edge 9 forming the ⁇ web W.
- That portion of the strip between the bend 4 and the edge 7 is bent at a'point spaced from the bend 4 ina reverse bend 5.
- the strip portion adjacent the edge 7 is bent in a second reverse bend 6 substantially equispaced with the bend 5 from the right angle bend 4 to provide the branches of the ange F with substantially equal width and thickness.
- Thefstripadjacent the edge 9 is bent in a U-bend 8 to provide a channel 8 at the top of the web W.
- This provides a rigid and strong T bar made from relatively thin sheet material.
- the main runners 1 may be provided with apertures 23 for the attachment of the usual suspension means, such as wires or the like.
- the connector means for securing the cross members 2 to the main runners 1 comprises ears or loops 10 and 11 respectively extending from opposite sides of the web W of the main runner 1 and in line with the position of the cross members 2.
- These ears or loops 10 and 11 are preferably struck from the web W and formed mmediat'ely adjacent each other and at spaced intervals longitudinally of -the web W.
- the loops are of two different depths as best shown in Figure 3, and include an upper part 12 relatively widely spaced and a lower part 13 relatively closely spaced from the web W so that 'the space or slot provided between each loop and the'adjacent side of the web is of semi-keyhole shape, thatis, a keyhole divided down the middle by a straight line.
- a finger or hook-like element 14 at each end of the cross members 2, -andwhile these elements may be integral with the webs W, preferably they are formed as part of a clip 17 attached at each end of the web.
- Each element 14 extends at right angles to the Web W or the clip 17, as the case may be, at each end of the cross members 2 and the elements at opposite ends of the members ⁇ 2 are on oppositely disposed sides of the web W.
- the element 14 has a main horizontal body portion 16 which terminates ina downwardly extending finger 15, as best illustrated in Figures 2 and 5, the body portion 16 having a length substantially equal to the width of a loop 10 or 11.
- Each element 14 is provided at the juncture of Athe horizontal portion 16 and finger 15 with a protrusion or detent 19 extending from the finger toward the cross member a distance less than the spacing of the portions 12 but greater than that of the portions 13.
- the clip 17 (is illustrated vas being formed by a separate plate or piece of sheet material, which is fitted in the channel 8 and secured to the web W of the cross member 2, as by spot welds 18.
- the ends 20 of the flanges F of the cross members 2 are recessed from the fingers 14 a distance equal to the width of the branches of'the flanges F of the runners 1, either by notches formed in said members or by offsetting the clips 17 relative to the ends of said members.
- the webs W or clips 17 are provided with notches 22 to accommodate the U-bends 8 of the webs W of the main runners 1.
- the webs W or clips 17 are provided, immediately adjacent the lingers 14, with offsets 24 half the thickness of the webs W or clips 17.
- the end of the flange F of the cross member is adapted to engage the adjacent edge of the flange F of the main runner so that when the cross member is fully connected, a Very rigid construction is obtained. Furthermore, due to the fact that the lingers 14 on the opposite ends of the cross members are on the opposite side of the webs W, the connections at opposite ends brace the members against the oppositely disposed connection to the adjacent runner and helps to prevent the cross members 2 from twisting after being brought in place.
- Connecting means for ceiling grid members having vertically disposed web portions comprising a vertically disposed loop on the web portion of one member with the upper portion of said loop extending farther from the web portion than the lower portion of said loop and forming with the web portion a vertically extending slot of semi-keyhole shape with the upper portion wider than the lower portion thereof, and a flat hook-like portion on the end ofthe web portion of another member disposed perpendicular to the one member, said hooklike portionV being at right angles to its web portion and including a horizontal portion secured to the web portion and a downwardly extending finger on the free end of said horizontal portion and spaced from the web portion,
- said horizontal portion having a length substantially equal to the width of said loop and said finger being of such size that it may pass through said loop whereby said hook-like portion extends through said loop with said finger and web portion snugly straddling said loop, and a ⁇ detent on said hook-like portion at the junction of said horizontal portion and said linger and protruding from said hook-like portion a distance greater than the narrow portion but less than the wider portion of said slot and abuts the adjacent edge of said loop retaining Said hook-like portion in said loop after said' detent has been passed through the wide portion of said slot and lowered into juxtaposition with the narrow portion thereof.
- Connecting means for ceiling grid members including main runners and cross-members disposed penpendicularly between the main runners and each having Verrtivally disposedy web portions and horizontal flanges supporting ceiling panels, comprising two vertically disposed loops in side-by-side relation on the web portion of said main runners, said loops extending from opposite sides -of the web portion with the upper portion of each said loop extending farther from the web portion than the lower portion of each said loop and each forming withr the web portion a vertically extending slot of semikeyhole shape with the upper portion wider than the lower portion thereof, and a flat hook-like portionv on each end ofthe webportion of saidV crossmembers, each ofl said hook-like'portions beingV at right angles to its web portion and including a horizontal portion secured to the' web portion and a downwardly extending finger onthe free end of said horizontaly portion and spacedV from the web portion; said horizontal portion having a length substantially equal to the width of saidv loop and said finger lbeing of such size that it may pass through said loop
Description
JUIYZS 195.9 K w. v. wlLDE 21,896,752
SUSPENDED c EILING GRID CONSTRUCTION Filed May ll, 1956 United States Patent SUSPENDED CEILING GRID CONSTRUCTION William V. Wilde, Portland, Ore'g.
Application May 11, 1956, Serial No. 584,249
2 Claims. (Cl. 189-356) panels for decorative, acoustical, or light reilecting purposes.
The primary object of this invention is to provide a novel means for interlocking the cross runners of the grid framework to the main carrying runners in a simplilied manner Vthat will reduce the time normally required for installation.
Another object of this invention is to provide a connection between ceiling grid members having a positive locking connection between the grid members.
A further object of this invention is to provide a connection between ceiling grid members having a positive locking connection between the grid members and which is capable of being manually disengaged from each other without deformation to either member or the connector mechanism to facilitate rearrangement of grid members, complete disassembly, or provide large openings for access to the area above the suspended ceiling.
It is another object of the invention to provide a ceiling grid construction having simplicity of design, economy of construction and eiliciency in operation.
Briefly, the novel connection between grid members, according to the present invention, is achieved by providing offset ears or loops on each side of the main runners at given intervals and providing slots of semi-keyhole shape for the reception of clips including hook-like portions having detents for insertion in said slots and that are securely fastened to the ends of the cross member. The clip at each end `of the cross member may be an integral part thereof but it "is preferred, however, to fabricate the clips separately to effect economy of material and simplicity in manufacture.
The novel featuresthat are considered characteristic of the invention are set forth with p-articularity in the appended-claims. The invention itself, however,vboth as to its organization and its method of operation, together with additional objects and advantages thereof, will best be understood from the following description of a specic embodiment when read in connection with the accompanying drawing, wherein like reference characters indicate like parts through the several gures and in which:
Figure l is a fragmentary top plan view of a suspended grid ceiling with some of the ceiling panels installed;
Figure 2 is an exploded view in perspective of the adjoining portions of the grid members and the connection therebetween;
Figure 3 is a fragmentary'cross-sectional view taken on line 3 3 of Figure 2;
Figure 4 is a cross-sectional view taken on line 4-4 of Figure 31;
Figure 5 is a cross-sectional view taken on line 5 5 of Figure 2, andV Figure 6 is an enlarged fragmentary cross-sectional view similar to Figure 4 and illustrating two cross members connected to the main runner.
Referring now to the drawings in detail, specifically to Figure 1, a typical suspended ceiling comprises a grid construction formed by main runners 1 and cross members 2 connected to one another in continuous grid formation. These main runners 1 and the cross members 2 are of T-section and are positioned in inverted relation with their webs W disposed vertically and their flanges F beneath the webs and disposed horizontally.
Ceiling panels P are mounted on the grid assembly with edges lnesting within the webs W of opposed runners and cross members and resting on the anges F thereof.
The structure, that is the cross-sectional conformation of the runners 1 and cross members 2 is substantially identical and preferably they are formed of strips 3 of sheet material which are bent to shape, as best shown in Figure 2. The strips 3 of sheet material are bent intermediate 'their longitudinal edges 7 and 9 in a right angle bend 4, the portion 'between the bend 4 and edge 7 forming the flange F, `and the portion between the bend 4 and edge 9 forming the `web W. To form the cross flange F, that portion of the strip between the bend 4 and the edge 7 is bent at a'point spaced from the bend 4 ina reverse bend 5. The strip portion adjacent the edge 7 is bent in a second reverse bend 6 substantially equispaced with the bend 5 from the right angle bend 4 to provide the branches of the ange F with substantially equal width and thickness. Thefstripadjacent the edge 9 is bent in a U-bend 8 to provide a channel 8 at the top of the web W. This provides a rigid and strong T bar made from relatively thin sheet material. The main runners 1 may be provided with apertures 23 for the attachment of the usual suspension means, such as wires or the like.
The connector means for securing the cross members 2 to the main runners 1 comprises ears or loops 10 and 11 respectively extending from opposite sides of the web W of the main runner 1 and in line with the position of the cross members 2. These ears or loops 10 and 11 are preferably struck from the web W and formed mmediat'ely adjacent each other and at spaced intervals longitudinally of -the web W. The loops are of two different depths as best shown in Figure 3, and include an upper part 12 relatively widely spaced and a lower part 13 relatively closely spaced from the web W so that 'the space or slot provided between each loop and the'adjacent side of the web is of semi-keyhole shape, thatis, a keyhole divided down the middle by a straight line.
Cooperative With the ears or loops 10 and 11 is a finger or hook-like element 14 at each end of the cross members 2, -andwhile these elements may be integral with the webs W, preferably they are formed as part of a clip 17 attached at each end of the web. Each element 14 extends at right angles to the Web W or the clip 17, as the case may be, at each end of the cross members 2 and the elements at opposite ends of the members` 2 are on oppositely disposed sides of the web W. The element 14 has a main horizontal body portion 16 which terminates ina downwardly extending finger 15, as best illustrated in Figures 2 and 5, the body portion 16 having a length substantially equal to the width of a loop 10 or 11. Each element 14 is provided at the juncture of Athe horizontal portion 16 and finger 15 with a protrusion or detent 19 extending from the finger toward the cross member a distance less than the spacing of the portions 12 but greater than that of the portions 13.
The clip 17 (is illustrated vas being formed by a separate plate or piece of sheet material, which is fitted in the channel 8 and secured to the web W of the cross member 2, as by spot welds 18. The ends 20 of the flanges F of the cross members 2 are recessed from the fingers 14 a distance equal to the width of the branches of'the flanges F of the runners 1, either by notches formed in said members or by offsetting the clips 17 relative to the ends of said members. At their upper corners, the webs W or clips 17 are provided with notches 22 to accommodate the U-bends 8 of the webs W of the main runners 1. In order to maintain the center lines of the cross members 2 in alignment with one another on opposite sides of the main runners 1, the webs W or clips 17 are provided, immediately adjacent the lingers 14, with offsets 24 half the thickness of the webs W or clips 17.
In assembly, the end of a cross member 2 is abutted against the side of a main runner 1 and raised slightly so that the detent 19 will pass through the enlarged portion 12 of a loop 10 or 11 as the cross member is moved sidewise in the direction of the arrow (Figure When the'iinger 15 has passed through the loop, the end of the member is lowered to the -postion shown in Figures 2, 3 and 4, so that the cross member will be be securely locked in the fixed position shown in these views, with the deten-t 19 engaged behind the edge 13A of the narrow portion 13 of the loop, assisting the tip ofthe linger from being withdrawn or tipped out of position. The end of the flange F of the cross member is adapted to engage the adjacent edge of the flange F of the main runner so that when the cross member is fully connected, a Very rigid construction is obtained. Furthermore, due to the fact that the lingers 14 on the opposite ends of the cross members are on the opposite side of the webs W, the connections at opposite ends brace the members against the oppositely disposed connection to the adjacent runner and helps to prevent the cross members 2 from twisting after being brought in place.
Although a certain specific embodiment of the invention has been shown and described, it is obvious thaty many modifications thereof are possible. The invention, therefore, is not to be restricted except insofar as is necessitated by the prior art and by the spirit of the appended claims.
What I claim is:
1. Connecting means for ceiling grid members having vertically disposed web portions, comprising a vertically disposed loop on the web portion of one member with the upper portion of said loop extending farther from the web portion than the lower portion of said loop and forming with the web portion a vertically extending slot of semi-keyhole shape with the upper portion wider than the lower portion thereof, and a flat hook-like portion on the end ofthe web portion of another member disposed perpendicular to the one member, said hooklike portionV being at right angles to its web portion and including a horizontal portion secured to the web portion and a downwardly extending finger on the free end of said horizontal portion and spaced from the web portion,
said horizontal portion having a length substantially equal to the width of said loop and said finger being of such size that it may pass through said loop whereby said hook-like portion extends through said loop with said finger and web portion snugly straddling said loop, and a `detent on said hook-like portion at the junction of said horizontal portion and said linger and protruding from said hook-like portion a distance greater than the narrow portion but less than the wider portion of said slot and abuts the adjacent edge of said loop retaining Said hook-like portion in said loop after said' detent has been passed through the wide portion of said slot and lowered into juxtaposition with the narrow portion thereof. f
2. Connecting means for ceiling grid members including main runners and cross-members disposed penpendicularly between the main runners and each having Verrtivally disposedy web portions and horizontal flanges supporting ceiling panels, comprising two vertically disposed loops in side-by-side relation on the web portion of said main runners, said loops extending from opposite sides -of the web portion with the upper portion of each said loop extending farther from the web portion than the lower portion of each said loop and each forming withr the web portion a vertically extending slot of semikeyhole shape with the upper portion wider than the lower portion thereof, and a flat hook-like portionv on each end ofthe webportion of saidV crossmembers, each ofl said hook-like'portions beingV at right angles to its web portion and including a horizontal portion secured to the' web portion and a downwardly extending finger onthe free end of said horizontaly portion and spacedV from the web portion; said horizontal portion having a length substantially equal to the width of saidv loop and said finger lbeing of such size that it may pass through said loop whereby said-hook-like portion extends through said loop with'said linger and'web portion snugly straddling said loop, and a detent on said hook-like portion atthe junction of said horizontal portionand said finger and protruding `from said hook-like portion a distance greater than the narrow portion but less thanfthe wider portion of said slot and abuts the adjacent edge of said` loop retaining said hook-like portion in said loop after said detent has been passed through the wide portion of said slot and lowered into juxtaposition with the. narrow portionthereof, saidy loops and hook-like portions' being relatively loffset and positioning the web portions of said cross-members on opposite sides of said main run# ners in alignment.
References Cited in the le ofV this patent UNITED STATES PATENTS' Re. 12,922 coiiins Feb. 23, 1909' Y 490,921 Peet Jan. 31, 1893V 511,383 White Dee.y 26, 1893 893,815' schuit July. 21, 190s 1,090,171 Schisler Mar. 17, 1914 ,1,118,979` weiss Dec; 1, 1914 1,537,459 Campbell May 12, 1925' FoRErGN: PATENTS 397,496 GreatBrirain Aug. 213, 1933
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US584249A US2896752A (en) | 1956-05-11 | 1956-05-11 | Suspended ceiling grid construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US584249A US2896752A (en) | 1956-05-11 | 1956-05-11 | Suspended ceiling grid construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2896752A true US2896752A (en) | 1959-07-28 |
Family
ID=24336550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US584249A Expired - Lifetime US2896752A (en) | 1956-05-11 | 1956-05-11 | Suspended ceiling grid construction |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2896752A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3093221A (en) * | 1959-11-18 | 1963-06-11 | W J Haertel & Co | Ceiling construction means |
| US3169614A (en) * | 1962-01-23 | 1965-02-16 | Nat Rolling Mills Co | Suspended ceiling grid structure |
| US3213979A (en) * | 1962-09-20 | 1965-10-26 | Lok Products Co | Suspended ceiling |
| US3292332A (en) * | 1960-12-21 | 1966-12-20 | Chicago Metallic Sash Co | Suspended ceiling structure |
| US3333387A (en) * | 1965-08-27 | 1967-08-01 | Deakins Donald | Ceiling panel structure |
| US3385021A (en) * | 1965-02-15 | 1968-05-28 | Eternit | Support grid for panels for a false ceiling |
| US4011707A (en) * | 1975-07-02 | 1977-03-15 | Armstrong Cork Company | Cross tee end joint for suspended ceiling system |
| US4727703A (en) * | 1986-07-18 | 1988-03-01 | National Rolling Mills Inc. | Suspended ceiling grid structure |
| ITVR20130230A1 (en) * | 2013-10-17 | 2015-04-18 | Giuseppe Cipriani | CONNECTION ACCESSORY OF A PROFILE OF A STRUCTURE SUPPORTING A FALSE CEILING |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US490921A (en) * | 1893-01-31 | Fastener for garments | ||
| US511383A (en) * | 1893-12-26 | Sheet-metal beam | ||
| US893815A (en) * | 1907-02-18 | 1908-07-21 | Hinrich B Schutt | Structural metal-work in buildings. |
| US1090171A (en) * | 1913-01-27 | 1914-03-17 | Frank J Schisler | Reinforced tubular building unit. |
| US1118979A (en) * | 1914-01-26 | 1914-12-01 | Yawman & Erbe Mfg Co | Tie-piece for metallic furniture. |
| US1537459A (en) * | 1923-06-09 | 1925-05-12 | Campbell Charles Peter | Locking tongue for knockdown furniture |
| GB397496A (en) * | 1932-02-23 | 1933-08-23 | Clotaire Reynard | Improvements in and relating to the assembling of constructional metal work |
-
1956
- 1956-05-11 US US584249A patent/US2896752A/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US490921A (en) * | 1893-01-31 | Fastener for garments | ||
| US511383A (en) * | 1893-12-26 | Sheet-metal beam | ||
| US893815A (en) * | 1907-02-18 | 1908-07-21 | Hinrich B Schutt | Structural metal-work in buildings. |
| US1090171A (en) * | 1913-01-27 | 1914-03-17 | Frank J Schisler | Reinforced tubular building unit. |
| US1118979A (en) * | 1914-01-26 | 1914-12-01 | Yawman & Erbe Mfg Co | Tie-piece for metallic furniture. |
| US1537459A (en) * | 1923-06-09 | 1925-05-12 | Campbell Charles Peter | Locking tongue for knockdown furniture |
| GB397496A (en) * | 1932-02-23 | 1933-08-23 | Clotaire Reynard | Improvements in and relating to the assembling of constructional metal work |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3093221A (en) * | 1959-11-18 | 1963-06-11 | W J Haertel & Co | Ceiling construction means |
| US3292332A (en) * | 1960-12-21 | 1966-12-20 | Chicago Metallic Sash Co | Suspended ceiling structure |
| US3169614A (en) * | 1962-01-23 | 1965-02-16 | Nat Rolling Mills Co | Suspended ceiling grid structure |
| US3213979A (en) * | 1962-09-20 | 1965-10-26 | Lok Products Co | Suspended ceiling |
| US3385021A (en) * | 1965-02-15 | 1968-05-28 | Eternit | Support grid for panels for a false ceiling |
| US3333387A (en) * | 1965-08-27 | 1967-08-01 | Deakins Donald | Ceiling panel structure |
| US4011707A (en) * | 1975-07-02 | 1977-03-15 | Armstrong Cork Company | Cross tee end joint for suspended ceiling system |
| US4727703A (en) * | 1986-07-18 | 1988-03-01 | National Rolling Mills Inc. | Suspended ceiling grid structure |
| ITVR20130230A1 (en) * | 2013-10-17 | 2015-04-18 | Giuseppe Cipriani | CONNECTION ACCESSORY OF A PROFILE OF A STRUCTURE SUPPORTING A FALSE CEILING |
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