CA1265705A - Structural spacer glazing - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A glass insulating sealed unit suitable for capless or stopless glazing comprises two spaced-apart glass plates and spacers to separate and join the glass plates arranged about the entire periphery of the plates and between the plates. The spacers are adapted for connection of the unit to adjoining support members in order to support and fix the unit. The preferred spaces each comprise a generally channel-shaped member having its elongate recess open along the edge of the unit.
Structural sealant on two opposite sides of each spacer bond each of said sides to the adjacent inside surface of a respective glass plate. An elongate strip of compound providing both dessicant and vapour seal extends between the glass plates and along inside surface of the spacer.
Each spacer is preferably connected to a support member by means of flat clips evenly spaced along the spacer and threaded connectors extending through holes in said clips.
Each clip has two flat ends with the thickness of each end being about equal to or less than the width of the recess formed by the spacer. The dual purpose compound can be a combination of butyl rubber and polyisobutylene that adheres to the glass plates and is capable of continuing to adhere to either glass plate in the event the structural sealant fails.

Description

This inven-tion relates to insula-ting sealed units and in particular -to sealed units rnade Erom glass plates.
It is well Icnown to construct a glass insulating sealed unit made from two or more spaced-apart shee-ts of glass with the glass plates being separated by spacers that are made to act as vapour seals or combined with such seals. The gas or air between the glass plates is made vapour free and generally a dessicant material is provided in or in the region of the spacers -to maintain the moisture-free environment between the glass plates. It is necessary to maintain a moisture-free condition between the glass plates if the sealed unit is to be kept in a condition where condensation does not form and the unit can always brought -to a very clear, transparent condition.
Various arrangements are known at the present time for mounting and supporting the sealed units in a framework or mullion without exterior stops or caps. The interior light or sheet of glass of the unit can be adhered ~o the structural mullion frame in situ or alternatively this light can be adhered to a framework in a factor~ and then the total combination can be clipped or bolted in place. ~lthough it is preferable to adhere the inner light to the adjoining framework, it is also possible to adhere both the interior and exterior lights to the framework or just the exterior light~ Generally a setting block is placed between the inner surface of the edge portion of the .

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When the interior light is adhered direc-tly to the mullion frame, all the wind and gravity loads acting on the unit pass through the adhesive sealant and, in the even-t of fai.lure of this sealant, the whole unit can fall out of -the frame. A further problem arises from the fact -that there is no reliable method of determining whether -the seal between the edges of the glass plates has failed.
Another problem with sealed units presently being sold is that the air or gas enclosed and sealed between the sheets of glass expands or contracts during the life of the unit due to temperature change, atmospheric pressure changes, outgassing of dessicant and/or environmental loads such as those caused by wind or snow. This expansion or contraction of the air in the unit can cause the glass to deflect. The deflection in turn produces stresses on the seals which can eventually result in their failure.
United States Patent No. 3,981,111 issued September 21, 1976 to N.T.L. Berthagen describes and illustrates an insulating unit wherein the glass plates are sealingly joined together around their peripheral edges by spacers which act as seals. The spacers are constructed to permit a pivo-ting movement of one of the transparent plates towards and away from the opposing plate, thereby to increase or decrease the volume of the enclosed gas or air .

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in response to temperature changes.
Recent U~S. Patent No. 4,348,435 issued September 7, 1982 to PPG Industries Inc. -teaches a multiple glazed unit having an organic elastomer sealant about its periphery. The unit is mounted into a curtainwall system by first coating the exposed organic elastomer sealant with a suitable primer before bonding the unit to the curtainwall system with silicone elastomer adhesive.
The present invention provides an insulating sealed unit that can be glazed without exterior stops or caps and -that reduces the loads on the structural sealants by 50% or, in some cases, considerably more.
In the glass insulating sealed unit disclosed herein, at least one of the lights of glass will be retained in place in the event of failure by the structural sealant and this will in turn mainkain the integrity of the building envelope provided by the glass units.
According to -the invention, a glass insulating sealed unit suitable for a building exterior comprises at least two spaced-apart glass plates and spacer means to join and seal the edge portions of said glass plates arranged about the entire periphery of said plates and between said plates, said spacer means including at least one connecting spacer device e~tending along at least one side of said unit having a channel-shaped recess that i9 open along the edge of the unit. There are also connecting . . ~`' ~ -.. . . ., ~ . . -:

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means Eor fastening saicl spacer clevice to an adjoining support member, said connecting means having a flat end portion. The sealed unit is Eastened to said support member by insertion of said flat end portion into said recess.
The connec-ting means can comprise a number oE
flat or L-shaped metal plates with the aforementioned flat end portion being part of each metal plate. Each plate has a hole -therein for passage of a threaded fastener.
According to a further aspect of the invention, a glass insulating sealed unit comprises at least two spaced-apart glass plates and spacer means to join and seal the edge portions of said glass plates arranged about the entire periphery of said plates and between said plates, said spacer means including at least one connecting spacer device extending along at least one side of said unit having a channel-shaped recess that is open along the edge of the unit, structural sealant on two opposite sides o~
said spacer device bonding each of said sides to an adjacent inside surface of a respective glass plate, and an elongate strip of compound capable of providing both a dessicant and a vapour seal extending between the glass plates and immediately adjacent to the surface of said spacer device which faces towards the centre of the sealed unit.

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According to s-ti.ll another aspec-t of the inventio:n, a glass ;.nsulating sealed uni-t co~prises -two spaced-apart glass plates and spacer means to join and seal the edge portions oE said glass plates arranged about the entire periphery of said plates and between sai.d plates, `' ; ' ' ~ `' ' :

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said spacer means inclucling spacer members extending along each side of said unit and having a channel-shaped recess that is open along the edge of the uni-t, and a separate uniti~ed connecting frame for fastening said sealed unit by means of the spacer members to adjoining supports, said frame having a hook portion extending about its perimeter on one side of said frame, wherein said hook portion has a flat end section that projects into said recess on all sides of said sealed unit.
Preferred embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings.
In the drawings, Figure l is a sectional detail illustrating one prior art method of sealing a.nd supporting a glass sealed unit, without the use of exterior caps or stops;
Figure 2 is another sectional detail illustrating an alternative prior art method for sealing and supporting a glass sealed unit, without the use of exterior caps or stops;
Figure 3 is an outside view of several sealed units constructed in accordanca with the invention and mounted in place;
Figure 4 is a sectional detail taken along the line IV-IV of Figure 3 showing details of a first . '' ' .: ' ' :'~ ". ' '7()5 embodiment oE the i.nvention and how i-t is connected to a mullion frame;
Figure 5 is a plan view of the spacer device shown in Figure 4, which view shows details of the joint at the corner of the sealed unit;
Figure 6 is a view similar to Figure 4 showing details oE a second embodiment of a sealed unit constructed in accordance with the invention;
Figure 7 is a sectional view showing details of a third embodiment;
Figures 8 to 11 are views similar to Figures 6 and 7 but showing further embodiments of the invention;
Figure 12 is a sectional detail showing a triple-gazed sealed unit constructed in accordance with the invention;
Figure 13 is a sectional detail of an embodiment wherein the dessicant enclosing chamber is separate from the structural spacer used to s~lpport the sealed unit;
Figure 14 is a sectional detail of a spacer davice constructed i.n accordance with the invention, which device is made up of two separate members;
Figure 15 is a sectional detail showing how two sealed units can be connected to a support frame by means of ~-shaped connectors;
Figure 16 is a perspective view of the H-shaped connector shown in Figure 15;

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Fiyure L7 is a sec-tional detail showing how the edges oE two sealed un:its can be connected by means of connec-ting bars that extend between -the edges of the sealed units and that are slide fitted at their ends into recesses formed in the spacer devices;
Figure 18 is a perspective view of the connecting bar used in the embodiment of Figure 17;
Figure 19 is a sectional detail of a spacer device which permits the sealed units to be mounted to the mullion frame from the inside of the building;
Figure 20 is a sectional detail showing how two sealed units can be connected to a support frame from the inside of the building using H-shaped connectors;
Figure 21 is a sectional detail showing how the structural spacer of -the present invention can be employed to support a spandrel glass panel;
: Figure 22 is a sectional detail of another sealed unit joined by means of connecting bars that extend between the edges of the sealed units:
Figure 23 is a sectional setail showing the result o~ a ailure of a structural seal in an embodiment similar to that shown in Figure 22;
Figure 24 is a sectional detail showing the edges of sealed units connected to a unitized frame;
Figure 25 is a plan view of the unitized rame ; :............. .

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only which frame forms part of the embodiment of Figure 24;
and Figure 2~ i9 a sectional detail oE yet another embodiment oE a sealed unit which is connected to -the mullion frame using special clips or connec-ting bars.
Figures 1 and 2 of the drawings illustrate alternative rnethods now used for mounting a glass insulating sealed unit without e~terior stops or caps.
Other methods are also known in the gla~ing industry but none of -these rnethods employ the spacer itself to support the sealed unit. In Figures 1 and 2 there are two, separated glass plates or lights 10 and 12. These lights are separated by a spacer 14, one of which extends along each of the edges of the sealed unit. The spacer preferably forms a substantially enclosed elongate cavity for holding a dessicant 16. A gap 18 is formed in the inner wall of the spacer so that the dessicant material can remove moisture from the gas or air enclosed by the plates 10 and 12. Located between the edges of the glass plates and about the outer side of the spacer 14 is unit sealing material 20 which preferably is a one part or two part silicone. As shown in Figures 1 and 2, the sides of the spacer 14 adjacent the glass plates have an elongate recess running along their length at 22 and 24. Located in these recesses is a vapour seal which provides protection from ~ . .

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S'705 molsture laderl air leaking into the space between the glass plates. In the construction of Figure 1, the interio~
glass plate 12 is attached to a mullion frame 26 by means of a structural seal 2~. A glass seat 30 is provided along the edge o:E the structural seal ~urthest from the edge 32 of plate 12. It wlll thus be appreciated that the entire glass unit is supported and held in place by t~e structural seal 28 and the failure of this seal would resul-t in a complete falling out of the sealed unit. In addition to the aforementioned seals, there is provided an additional weather seal 34 extending between the adjacent edges of the exterior plates 10.
The sealed unit shown in Figure 2 is mounted to a different type of mullion frame, which frame has an outward extension 36 that projects to a point in the plane of the exterior surface of plate lO o Extending between the edge of the glass plate 10 and the extension 36 is a combination weather and structural seal 38. In this embodiment the interior light 12 is not bonded to the mullion. Instead ; 20 there is simply a glass seat 40 positioned between the light 12 and the mullion. It will thus be appreciated that the entire glass sealed unit is held in place by the adhesive bond between the exterior light and the extension 36. A disadvantage of the prior art constructions shown in Figures 1 and 2 is the fact tha-t there i9 a high stress ;, ~ :, :

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placed on the structural seals 28 and 38. With -these cons-tructions, there will be no warning to the user or to the insta:Ller o:E seal failure and, if the seal Eails, the entire sealed uni~ will fall out leaving an opening in the building envelope. Another problem inherent in such installations is that in order to obtain proper adhesion ~ith the structural seal, the rnullion must be properly finished and it is sometimes difficult to ensure the necessary quality control in this regard.
Turning now to the construction of sealed units constructed in accordance with the present invention, Figure 3 of the drawings shows several of such units 11 mounted on a suitable mullion frame (not shown). A gap is formed between adjacent sides o the units 11 and this gap is preferably closed by means of the weather seal 34. On the right hand side of the figure, the weather seal has not been put in place in order to i].lustrate the elongate clamping bars 40 used to attach the sealed units to the mullion frame. Bolts 42 or other suitable fasteners are used to attach the clamping bar to the mullion frame.
These bolts 42 extend into holes in the mullion frame as will be explained hereinafter with reference to Figure 4.
In Figure 4 the adjacent edges of two sealed units 11 are shown, which edges are connected to the mullion :Erame 45 by means of two connecting spacer devices 44. Each device 44 joins and seals the edge portions of .

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the glass plates 10 and 12 and part thereoE is located between -these glass plates. Each device 44 comprises a first section 46 Eorming a substantially enclosed, elongate cavity for 'nolding dessicant, w~ich section is positioned be-tween the two glass plates 10 and 12 adjacent -the edges ~8 and 50 thereof. The spacer device also has a second sec-tion 52 in the form of an integral extension of the first section pro~ecting outwardly to a position 53 beyond the adjacent edges 48 and 50 oE the glass plates.
Preferably the second section 52 is made from a thicker metal than the major portion of the first section 46. The spacer device is preferably constructed from aluminum and the device is shaped as required by an extrusion process.
In the preferred spacer device 44 shown, there is a third section 54 which is an integral extension of the first section 46 and which projects outwardly away from the center of the sealed unit to a location directly between the adjacent edges 48 and S0 of the glass plates. It will be noted that both the second and the third sections are bonded to the glass plates by a structural sealant 56 which preferably is a two part, fast cure silicone sealant. This type of sealant does not break down under ultraviolet light. Each of the two spacer devices 44 is clamped to the end of -the mullion frame 45 by means of the clamping bar 40 and bolts 42. If necessary, a suitable cutout can be provided on the outer end of the section 52 to permit , . :
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passage oE the bolts 42. Threadecl holes 5~ are Eormed in -the mullion ~rame -to receive the bolts 42. ~n optional glass seat (not shown) can be provided between mullion frame 45 and each plate 12 if desired.
In order that the air between the plates 10 and 12 can reach the dessicant material 16 there is the usual gap 18 provided in the interior wall of the spacer device.
The preferred dessicant material is molecular sieve.
Instead of using dessicant material such as that shown, it is possible to use a light gas such as argon or argon-halocarbon mixture in the space between the glass lights. Such a gas will not form condensation in the interior of the unit. The use of such gases is w~ll known in the art. Located in the elongate recesses formed in the sides of the first section 46 adjacent the glass plates 10 and 12 there is moisture barrier sealant 62 (also called the vapour seal). The preferred sealant 62 is polyisobutylene which is a viscous material which remains ~iscous during the life o~ the sealed unit.
The silicone seals 56 and the structural spacer devices 44 in this embodiment and those described hereinafter should be constructed and arranged to minimize the movement o~ the vapour seal 62. This can be accomplished by making the hollow first section 46 slightly flexible and by making each silicone seal 56 rela-tively wide, preferably approximately 8 mm., and relatively thin - . :

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-15- ~ 705 in the direction perpendicular to the g:Lass plates, preferaby approxima-tel~ 3 mm. ~he seals should have parallel sides, should not be -thinner than 2.5 mm., and should be made with a high modulus silicone. The overall stress on the spacers in units constructed in accordance with this invention are not significantly greater than stresses in the spacers of typical "capped" units because -temperature and pressure loads (i.e. inside loads) are usually greater than wind suction loads (outside loads).
With structural spacers of this invention, it can be advantageouæ to make the inner plate of glass thicker than the outer plate because this will reduce the stress on the outer seal under wind suction load conditions.
In the embodiment of Figure 6, the adjacent edges of two sealed units are shown and these edges act as the mullion frame. Each connecting spacer device 74 joins and seals the edge portions of the two glass plates that make up each unit. ~ach device 74 comprises a first section 76 that forms a cavity for holding dessicant in the same manner as the first section 46 of the embodiment shown in Figure 4. In Figure 6, the first section 76 extends to a location directly between the edges of the glass plates.
The spacer device 74 also has a second section 78 in the orm of an integral extension of the irst section 76 and this second section comprises all of the portion of ~he device 74 located outside the space between the two glass .,, :., .`~i'`~ : ' -16~ '70$

plates. Again the second section 78 is -thicker than the ma-terial Eorming the f:irst section 76. The second 4ection 78 has first and second legs 82 and 84 with the second leg being con~iderably longer than the first leg. The first leg 82 extends from the first section 76 parallel to the glass plates to a position located out from the adjacent edges of the glass plates. The second leg 84 extends perpendicularly from the first leg and past the adjacent edye 80 of the inner light to a location beyond the plane of the outer surface 86 of the inner light. In the illustrated embodiment, the second section 78 also has a third leg 88 that extends perpendicularly from the end of the second leg that is furthest from the first le~ 82. If desired the two second legs 84 can be connected to one another to provide stability and support. In order to fasten the interior plate 87 after the frame has been assembled, the spacer devices 74 will typically only be used on two opposite sides of a sealed unit.
With the spacer device of Figure 6, the second leg 84 can be bonded to the adjacent edge 80 of the inner light by structural sealant 90. Further structural sealant 92 is provided between the first section 76 and the inner surface of the outer light 70. It will thus be appreciated that the spacer device 74 provides direct structural support for both the inner and outer lights.

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In the embodimen-ts oE Figures 4 and 6 and embodirnen-ts clescri~ecl hereinafter, the f.irs-t sectionfi 46 and 76 each have two sldes 94 that ex-tend generally parallel to the major surfaces of -the glass plates. The portion of the side 94 closest to the edge of the adjacent glass plate is flat but the side bends outwardly at 96 towards the adjacent glass plate. ~his bend in each side forms a cavity between the flat portion of the side 94 and the adjacen-t glass plate, which cavity is suitable for the reception of the structural sealant.
In the embodiment of Figure 7, the glass plates of the uni.t 98 are connected to a mullion frame (not shown) by means of a spacer device 102. The device 102 includes a first section 104 forming the dessicant-holding cavity and located between the two glass plates. The device 102 has a second section 106 in the form of an integral extension of the first section and comprising first and second legs 112 and 114. rFhus the second section 106 first projects outwardly to a position beyond ~he glass edges 108 and 110 and then inwardly past the edge 108. Optionally the second leg 114 may be extended (as shown by the dashed lines 116) into a third leg similar to that shown in Figure 6. Again the second leg 114 is connected to the edge 108 by strv.ctural sealant 118.
In the embodiment of Figure 7, there is a third section 120 in the form of an integral extension of the :: -. . :
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' . . ' ' ~ ' `' ` . ; ' ~5'7(~5 firs-t section 104. This third section has a primary leg 122 parallel to -the glass plates and ex-tending to a position out from the edges 108 and 110 oF the glass plates and a secon~ary leg 124 extending perpendicularly from the primary leg and along the adjacent edge 110. The secondary leg 124 is bonded to -the adjacent edge 110 by structural sealant 126. A weather seal 128 bridges the gap between the secondary leg 124 and a similar adjacent leg.
In the embodiment of Figure 8 the connecting spacer device 130 has a ~irst section 132 with a cavity for holding dessicant and a second section 134, which is either an integral extension of the first section or a separate element, projecting outwardly to a position 136 beyond the adjacent edges of the glass plates. In this embodiment there is also a third section 138 integral with the section 132 which projects to and ends at a location directly between the adjacent edges of the glass plates. The third section 138 is bonded ~o the adjacent glass plate 140 by structrual sealant 142. Located between the second section 134 and the inner surface and edge of the glass plate 144 is a glass seat 146. As in the embodiment of Figure 7, the second section has a first leg extending from the first section 132 parallel to the glass plates to the aforemention0d position 136. The second section also has a second leg 148 extending perpendicularly from the first leg and past the adjacent edge o~ the glass plate 144 to a location beyond the plane of the outer surface of the glass , ~S'71(~5 -l9-pla-te 1~4. A ~lange 150 extends Erom one s.ide of the second leg 148 along the outer sur~ace o~ plate 144. The flange 150 is an integral par-t of the spacer device 130.
Again a weather seal at 152 is provided to bridge the gap between adjacent sealed units.
Turning now to Figure 9, in this embodiment the spacer devices along adjoining edges of adjacent sealed units differ in a manner which permits them to be interconnected to each other. As seen in Figure 9, the right spacer device 154 joins and seals the edge portions of the glass plates 155 and 156~ The left spacer device 158 joins and seals the edge portions of the glass plates 159 and 160. Each of the spacer devices 154 and 158 has a first section forming an elongate cavity for holding dessicant. A second section 162 of the right spacer device is an integral extension of the first section, projects parallel to the major surfaces of the glass plates, and is positioned midway between the planes defined by the outer surfaces of plates 155 and 156. The second section projects outwardly to a position between -the adjacent edge portions 163 and 164 of the plates 159 and 160. The section 162 also has holes formed therein for the reception of threaded fasteners 166. These fasteners extend through holes in a spacer 168 and into threaded holes in the mullion frame 170. On the other hand the left spacer device 158 has a second section 172 in the ~orm of an integral extension of the first section projecting ~- , .. . .. i-, :-- . .:
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outwa:rdly -to a position directly between the edges o pla-tes 159 and 16U. The lef~ spacer device also has a third section 174 in the form an integral extension Oe the first section projecting outwardly -to a position directly between the second and third sections 172 and 174 .is a channel-shaped recess 176 that is open along the edge of the sealed unit. It will be appreciated that the second section 162 of the right spacer device forms connecting means for fastening the left spacer device 158. The second 10 section 162 provides a flat end portion 178 with a thickness substantially equal to the width of the recess 176. When the sealed uni-t of plates 159 and 160 is to be installed in place, the recess 176 is slid over the flat end portion 178. It will thus be seen that the sealed unit 15 of plates 159 and 160 is adapted to be held in place and supported on an adjoining support member or frame 170 by the combination of the spacer device 158 and connecting means in the form oE an integral extension of the spacer device of an adjoining sealed unit.
The embodiment o~ Figure 10 is similar in many respects to the earlier described embodiment o Figure 6.
Accordingly only the differences between the two embodiments will be described in detail herein. It should first be noted that with the sealed units shown in Figure 25 10, the outer lights 180 have edge portions 182 that project beyond the edge portions of -the interior lights 184 in order to minimize the gap between the plates 180 which requires a weather seal. These sealed units are called ' '' ~

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"stepped" unlts be~au.se of the projecting edge por-tions o:E
one o:E the ].ights. I-t will be appreciated that "stepped"
UllitS can be useA with any of the embocliment~ of the present invention described herein i:E desired. Each spacer device :L86 has a first section 187, which section is positioned generally between -the glass plates and a second section 1.88 which, as beEore, in an integral extension of the .irst sec-tion and which projects outwardly to a position beyond the adjacent edge 190 of the interior light 184. The second section includes a first leg 192 and a second leg 194 perpendicular to the first leg. The two adjacent second legs 194 are clamped to the mullion frame 198 by a clamping bar 200. For purposes of the present invention, the spacer device 186 shall be considered as projecting from the side o~ the sealed unit even though only the second leg 194 projects beyond the edge 201 of the outer light.
The embodiment shown in Figure 11 has a spacer device with no dessicant-receiving cavity. The spacer device 202 in cross-sec-tion comprises at least three parts integrally connected together. There is a first part 204 extending parallel to the glass plates and disposed entirely between adjacent edge portions 205 of the glass plates. The second part 206 extends perpendicularly from the inner end of the first part 204 and the third part 208 is connected to the second part and extends parallel to the Eirst part to a position beyond the adjacent edges of the glass plates. Structural sealant 214 bonds the first and ., third parts to the inner sur:eaces of the adjacent glass plates. Immeclia-tely adjacent to -the inside sur:face of the second part 206 is a compound 216 capable of providing a dessicant and a vapour seal. This compound extends between the glass plates and it can be held in place by a flange 218. The compound 216 can be that marketed by Tremco which comprises dessicant impregnated butyl. The third parts 208 are clamped to the mullion frame 210 by clamping bar 212.
The embodiment shown in Figure 12 is similar to that o~ Figure 11 except that each sealed unit comprises three spaced apar-t glass plates, that is the units connected to the mullion frame by the spacer device 220 are tripled glaæed units. The device 220 has a first part 222 extending parallel to the glass plates and disposed entirely and directly between adjacent portions o the exterior glass plate 224 and the interior glass plate 225 It also has a second part 226 extending perpendicularly from the inner end of the ~irst part. A third part consists of a series of five legs 231 to 235, each of which is perpendicular to the adjacent leg or legs. The leg 231 is connected to the second part 226 and extends parallel to the first part to a position beyond the edge of plate 230.
Extending around the edge of the glass plate 230 is a glass seat 236 which is held in place by the legs 231, 232 and 233. Structural sealant 237 firmly fastens the fifth leg 235 to the inner surface of the plate 225. Also it is the fifth leg 235 that is clamped to the mullion frame by the clamping bar 238. In order to assemble one of these triple ... . .
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S';~05 glazed units, the glass pla-tes 224, 225, and 230 are arranged first in their respect:ive relative positions and the compound 216 is applied. The spacer devices 220 are then attached while their ends are unconnected to one another.
The struc~ural spacer 240 shown in Figure 13 is similar to that shown in Figure 11 and is clamped to a mullion frame in the same manner. The device in cross-section has three parts integrally connected together including a first part 241 ex-tending parallel to the glass plates and disposed entirely between adjacent edge portions 242 of the plates. A second part 243 extends perpendicularly from the inner end of the first part and is spaced inwardly rom t,he edges of the plates. A ~,hird part 244 is connected to the second part and extends parallel to the first part to a position beyond the adjacent edges of the ylass plates. Structural sealant 245 bonds the first and third parts to the glass plates. Unlike the embodiment of Figure 11, there is a separate spacer member 246 positioned adjacent to the spacer device 240 on the side of the second part 243 furthest from the adjacent edges 247 and 24~ of the glass plates. The spacer member 246 forms a substantially enclosed elongate chamber for holding dessicant and can be held in place by the sealant 245.
In Figure 14 the spacer device 250 comprises two separate members securely fastened together. This embodiment allows "standard" manuacturing techniques to be used in the construction of the unit. It has the further .

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advantage oE permitting the sealed unit to be ~ixed in place from ~he interior of the building if required. The first member 252 forms a substantially enclosed, elongate cavity 253 for holding dessicant. The first member also has means on the outer wall 254 for holding the second member 256. While the Eirst member 252 is located entirely between the glass plates, -the second member ex~ends outwardly from the first member -to a position beyond the adjacent edges of the glass plates. The holding means of the first member 252 deine an elongate slot 258 which is wider at the bottom than at the mouth thereof. The second member 256 has an anchor portion 260 adapted to be inserted in '~snap" fashion in the slot 258 and too wide to be pulled through the mouth of the slot. The second member may he constructed in any manner suitable for connectlng the spacer device to the adjoining frame. The illustrated second member extends past the edge of the interior light to a flange 263 and beyond. The flange 263 extends parallel to the outer surface of the interior light and is close to this outer surace. A glass seat 264 is inserted between the Elange 263 and the edge portion of the interior light. It should also be noted that structural sealant 266 bonds the exterior surfaces of the holding means to the glass plates on opposite sides of the first member 252.
Figures 15 and 16 lllustrate another orm of combination that can be used to provide a structural spacer capable o supporting a sealed glass unit. In this embodiment each spacer device 269 is constructed in essentially the same manner as the let spacer device 158 --.~

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~S'7~)5 in Figure 9. Thus each device forms a ch~nnel-~haped recess 270 that. is open along the edge of -the unit.
H-shaped connec-tors 271 are provided to fasten adjoining spacer devices to -the mullion ~rame 272. Typically these connectors can be spaced apart 6 inches or so with the spacing based upon wind suction design load. The construction of each connector 271 can be seen clearly from Figure 16. The connector includes a stem portion 272 having a square or rectangular cross-section, and two generally flat arms 273 projecting perpendicularly from one end of the stem portion 272. Each of these flat arms has a thickness indicated by the arrow T slightly less or substantially less than the width of the aforementioned recess 270. The top surace o~ the arms ~73 is separated by a groove or slot 274 into which the end of a standard screwdriver or other suitable tool can be inserted for rotating the connector about a longitudinal axis extending through the center of the stem portion 272. Extending outwardly from the bottom end of stem portion 272 are hook members 276. Each hook member has an upwardly extending lip 278 adapted to snap under another lip 280 formed in the mullion frame as shown in Figure 15.
In order to employ the connectors 271, the complete sealed units 282 are put in the required position on the mullion frame and are set on setting blocks in the conventional manner. At this time there is an open gap 284 b~tween the sealed units and the connectors 271 can be inserted through this gap when the arms ~73 extend parallel to the edges o~ the sealed units. .A slot is provided in ~;~. 30 the mullion frame to accommodate the hottom end of -the ." , ;, . . ~ .
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connector therein. The wldth of -the connector indicated by the arrow W in Figure 16 is less than the width of this slot in the mullion Erame. AEter i nsertion of the bottom end of the connector into -the slot, it is then possible to turn the connector by inserting a screwdriver in the slot 274 so that it is brought to the position shown in Figure 15. In this position the hook members 276 are locked into the mullion frame. At the same time the arms 273 extend into the two opposing recesses 270. Preferably there is a 10 sliding fit between each arm and its respective spacer device to permit each sealed unit some movement after installation. However i-t will be understood that the arms act to clamp the sealed unit -to the mullion frame via the spacer device. Glass seats 285 are provided between the 15 interior light of each sealed unit and the mullion frame.
After the connectors have been installed, the gap 284 can be closed by means of a weather seal material 286.
Except for the means to attach the spacer devices to the mullion frame, the en~bodiment shown in Figure 17 is 20 similar to that shown in Figure 15. The spacer devices 269 of the sealed units are exactly the same as are the glass seats 285. Extending betw~c~en -~he adjacent spacer devices at intervals of about 6 inches are flat, elongate metal plates 287, the construction of which can be seen clearly 25 from Figure 18. Located in the center of each plate is a hole 288 for receiving a threaded fastener 289. The plate 287 rests on a spacer sleeve or bar 290 through which extends a hole for passage of the fas tener 289.

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ti5~70~

The a:Eorement.ioned plate 287 is sufficiently narrow that it can be inserted through the gap 284 between -the edges oE the sealed units. The plate can then be turned 90 into the recesses 270 of the spacer devices~
Optionally a nib is provided in the bottom of each plate 287 and this nib locates a groove in the spacer 290 at the correct rotation. If a nib and groove are used, then the spacer 290 should be an integral part of the mullion. It will be appreciated that the end portions 291 of each metal plate have a thickness slightly less or ~ubstantially less than the width of the recesses 270. The thickness of the end portions is such that a sliding fit is preferably formed between -these end portions and the two spacer devices connected thereto. I desired each end portion 291 can be bevelled as shown to permit easy insertion into the recesses 270. The plates 287 a:re adapted to clamp the sealed units to the frame via the spacer devices 269.
Figures 19 and 20 illustrate structural spacer : devices constructed in accordance with the present : 20 invention w~ich permit the glass units to be installed from the lnterior of the building. This is particularly advantageous when the sealed units must be in talled on the upper floors of high buildings where scaf~olding cannot be empIoyed. The spacer devicas 269 are constructed in the same manner as earlier described embodiments such as those illustrated in Figures 15 and 17. Thus each spacer device provides a channel-shaped recess 270 that is open along the edge o~ the unit~ The left hand sealed unit 292 shown in , , ~

-2~-ii5~7~35 Figure ]9 is connected directly to the mullion fraTne 293 which i8 Eormed with an integral hook 294, the fla-t end of which fits snugly in the recess 270. If desired the flat end of the hook 294 can be bevelled at 295 to permit easy insertion. A glass seat 296 is provided between the outer surface of the interior light and the mullion frame. The left hand edge of each sealed unit is mounted in a diferent manner than -the right hand edge. The left hand edge of the unit 297 can be seen in Figure 19. This edge is connected by means of substantially L-shaped metal plates 298, each of which has a flat end portion 299 provided by one leg. The plate 298 can be a continuous plate along each edge of the unit if desirQd or there can be a number of individual plates 298 along each edge. A
hole for the passage of a threaded~fastener 300 is formed in the other leg of the connector. A locating tab 301 can be forrned on the mullion frame to properly orient the plate 298 if desired. After the sealed unit 297 has been mounted in place with the plates 298, the gap between the mullion frame and the outside surface of the interior light can be filled in by meAns of a suitable channel member 302 and a glass seat 303. The innermost side of the channel 302 is held by an integral clip 304 formed on the outwardly facing sur-face of the mullion frame.
In the embodiment illustrated by Figure 20, the spacer devices 269 are the same as those shown in Figure 19 and previous figures. The sealed units are connected to a mullion rame 305 by H shaped connectors or clips 306~ The .. ., . ,, :

;:- ~, -29~
~S~705 connec-tors 306 are constructed in the same manner as the connec-tors 271 shown in Figure 15 except -that they are provided with means on their inner ends to permi-t ro-tation about their central axis. Prior to installation of the sealed units, there is a passageway through the mullion frame provided by openings 307 and 308 and the cavity 309 in the frame. At this time, the cover plate 310 is detached from the mullion frame. Thus it is possible to pass the connector 306 -through the mullion frame from the inside of the building so that the two arms are brought into alignment with the recesses in the spacers 269. Then by means of a special screwdriver inserted into the slot or recess 311, it is possible to rotate each connector about the central axis oE its stem so that the arms are brought into engagement with the recesses. At the same time, the hook members 312 are snapped over the inwardly directed lips 313 of the mullion Erame. After installation of all of the necessary connectors 306, each of the required cover plates 310 can be attached to the innermost wall of the 20 frame 305. The weather seal 314 can be applied from the exterior of the building without difficulty in a well known manner.
Figure 21 illustrates how a structural spacer constructed in accordance with the present invention can be used in conjunction with an insulated panel such as a spandrel glass panel. Each spandrel unit 316 has a glass light 317 forming the outside surface, an insulating space 318 and an insulating panel 319 having dimensions : ' :. -: :

S'~(15 lengthwise and wiclthwise similar to those of -the glass plate. A structural spacer device 320 constructed in essentially the same manner as the spacer devices 4~ shown in Figure 4 joins the light 317 to the panel 319.
Structural sealant is provided at 321 to join the spacer device to -the light 317 and the panel 319. Generally, with units of this nature, a reflective material 322 is applied along the inside surface of -the light 317 so that the panel 319 can no-t be readily seen by an outside observer. Each of the panels 319 can be constructed with the use of two, spaced apart metal sheets separated by a layer of polyurethane or polyethylene 328. Insulating panels of this nature are well known as building products. The preferred metal for sheets 329 is either aluminum or steel.
The preferred embodiment shown in Figure 22 is similar in some respects to the ambodiment shown in Figures 11 and 17. A spacer device 330 has a channel-shaped recess 332 that is open along the edge of the unit. Structural sealant 334 is loca-ted on two opposite sides of the device 330 and this sealant bonds each of the sides to an adjacent inside surface of a respecti~e glass plate. The spacer device 330, which is generally U-shaped, has small longitudinal flanges 336 that extend perpendicularily rom each of the opposite sides and towards the adjacent glass plate. These flanges help to secure an elongate strip of compound 338 extending between the glass plates and immedi.ately adjacent to the surface oE the device 330 which faces towar the centre of the sealed unit. The compound . ~

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." :. . .

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. .

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338 is capable of provicling both a dessicant and a vapour seal and can be the same compound as the compound 216 used in -the embodiment of Figure 11. The preEerred material is dessicant impregnated butyl that adheres to the inside surfaces of glass plates and is capable of continuing to adhere to either glass plate in the event the structural sealant 334 should fail. As can be seen from Figure 22/
the compound 338 preferably extends around and covers the flanges 336. Thus the edge of each flange does not come into contact with the adjacent glass plate.
In the illustrated preferred embodiment, the sealed units of Figure 22 are connected to the mullion frame 340 by means of clips 342 which can be of the same construction as that shown in Figure 18. These clips clamp the sealed units to the mullion frame by means of threaded fasteners 344. Preferably a glass seat 346 is arranged between the edge of the sealed unit and the mullion frame before the sealed unit is clamped into place.
There are several advantages to the construction shown in Figure 22. It provides a flexible spacer joint which accomodates lateral and rotational movements and this increases the service life of each sealed unit. Because of its simple construction, the cost of tooling for production of these units is low. Perhaps the greatest advantage arises from the protection it provides against the possibility of a failure of the structural sealant 334, The preferred compound 338, such as a combination of butyl rubber and polyisobutylene is a fluid material and it can be sized and shaped so that in the event that the ,. : , structural sealan-t should Eail, -the compound 338 will flow and remain adhered to the glass surfaee. The end result is tha-t the air space be-tween the glass plates remains sealed.
If a high negative wind load acts on the outer liyht 348, the light will move relative to the inner light 350 and thereby increase the volume of the air space between the two lights until the pressure is equalized on both sides of the outer light 348. At this point the outer light will be carrying virtually no load and the inner light 350 which is mechanically held will carry the majori-ty of the wind load.
Thus the outer light should remain in place if the sealant 334 has failed.
In order to construct the sealed lmit of Figure 22, the spacer devices 330 are preferably made from extruded aluminum which is notched and cut to length. The spacer device 330 can be clear anodized for good long term adhesion and low friction with the clip 342. The next step in the manufacturing process is to roll the compound 338 onto the spacer device which at this stage has a length equal to ~he sum of the length of the four sides o~ the uni~. The aforementioned notching is carried out in order to permit the device to be bent into a rectangle. After bending takes place, the butyl aompound 338 is fused at the previously unconnected fourth corner. Next the bent spacer device is jigged so that it is square and is placed on one light o glass. The second light o glass is then put in place and the entire unit is rolled through a heated roller press. The silicone structural sealant 334 îs then put in place by means of a suitable caulking gun and nozzle.

. . , ` ~ ::: ~: .. ;

;.L~tjS~05 A variation on a construction shown in Figure 22 is lllustrated in Figure 23 of the drawings. In this embodiment even iE there is -total seal failure, that is failure of the structural sealant as wel] as the seal provided by the compound 338, the exterior light 348 will still normally be held in place. As in the embodiment of Figure 22 the inside light 350 is held in place by mechanical means w~ich include th~ spacer device 330, clips 342 and -threaded fasteners 344. The exterior light 348 is normally held in place by the structural sealant 334 as well as the aforementioned compound 338.
The embodiment of Figure 23 dif-fers from that shown in Figure 22 in that the weather seal 352 has pressure equalization holes 354 distributed along its length and on each side of the sealed unit. The provision of these holes means that the pressure on the inside of the outer light 348 and in a bar chamber 356 will be equal with the pressure on the outside of the building in the event of total seal failure as indicated at 358. The air seal 346 between the inner light 350 and the glazing bar 360 should be a good air seal although not necessarily perfect. In addition partitions 362 should be located at the corner of each lite. Each of these partitions extends tranversely across the bar chamber 356 and the effect of the partitions is to isolate the air into pressure compartments, This can be accomplished by the injection of an expandible silicone foam.

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,;

With -the aforemen-tioned embodiment, there can be a comple-te seal failure between the outer light 348 an~ the structural spacer 330 on three or four s:ides and yet the outer light will be held in place. The air entrapped between the weather seal 352 and the bar chamber 356 will dampen the wind gust and the pressure equalization holes 354 will equalize the pressure, relieving considerably the load on the outer light 348 and the weather seals. With this particular design the inner light 350 is designed to carry all the wind negative load and is limited in its deflection so that the outer light 348 will not be forced to move too much to equalize the pressure in the event of quick wind gusts. As will be appreciated by those sXilled in this art, this pressure equaliæation system can be applied to any double skin wall where the exterior skin or light is not mechanically held and a back up means is required so that the outer skin or light will not become completely detached from the unit.
In the system shown in Figure 24, the sealed units 362 are mounted on a special frame 364 which is shown separately in Figure 25. The frame has the same shape and size as the sealed unit which is mounted on one side of the frame. Preferably the frame is constructed from aluminum and has a hook portion 366. It will be appreciated that the hook portion extends completely around the perimeter of the frame as indicated in Figure 25. The hook portion has a L-shape in cross-section and this portion is in the illustrated embodiment connected to a channel portion 368 to construct the complete assembly, the frame 364 is built : :
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around the sealed unit 362. A flat end section 370 of the hook portion projects into -the recess 372 formed by the spacer device. When the hook portion is engaged on all sides ! the sections of the frame 364 are assembled by means of well known port-hole screws 374 or alternatlve methods typically used with window frames. Preferably an air seal 376 is installed between the interior light and the channeL
portion of the frame. After construction of the unitized frame consisting of the frame 364 and the sealed unit, the unitized Erame can be fixed to adjoining supports of the building from the interior of the building. The weather seal 378 is then applied to complete the installation.
Another embodiment employing clips 380 is shown in Figure 26 of the drawings. The clips are used to connect sealed units 382 to a mullion frame 384. Metal spacer means 386 are similar in their construction to known spacer means but, unlike the known spacers, they are inset from the edges of the unit. Preferably the inset 388 is approximately 1/2" (13 mm). Except or the inset, the manufacture of the sealed units 382 is conventional.
In order for the clips 380 to engage the interior light 390 and clamp it to the mullion rame, each clip is provided with glass protective seats 392, one at eac~ end.
The preferred material for such seats i5 neoprene. It will be appreciated that each end portion of the clip 380 with the glass protec-tive seat in pla~e must have a thickness less than or equal to the distance between the glass plates. The sealed unit 3~2 is fastened to the mullion frame 384 by insertion of the end portions of a number of - ~ . . -- '' "''; ` " ' ' ~' "' ~

- 3~ -5'~:3~
clips 380 into the edge recess ~ormed by the inset 388 and by a-ttachmen-t oE the cllps to the adjoining support member or frame 384. Again a glass seat 394 is preeerably provided to protect -the inner light.
The advantages of the structural spacer in its various forms as described will be readily apparent to those skilled in -the construction of sealed glass units.
The use of such spacers avoids the need Eor exterior stops or caps and can reduce the load or tension stress on the seals by 50% or more. Moreover most embodiments of the sealed units of the invention can be manufactured using standard manufacturing processes and these structural spacers can be designed Eor use with all known types of fastening devices including clips, screws, etc. Further possible advantages include the ~act that the construction of the spacers and the use thereof is not dependent on glass thickness. Sealed units constructed in accordance with khe present invention can be tested in any of three possible ways in order to determine whether or not seal adhesive failure may have taken place. The units can be visually inspected for condensation, due point tested, or pressure tested. The second method involves the use o the well known "due point" apparatus to test the unit. In pressure testing, gas is blown into the unit via a breather tube installed during manufacture. A failure of the seal during this test will not result in glass ~allout but by an almost instantaneous pressure drop, indicating ~ailure.

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One method of construc-ting many of the sealed units, herei.n describecl comprises assemb:Lirlg -the spacer frame to form a rectangle w.ith either temporary or permanent corner pieces. Each corner is then dip-soldered at 53 (see Figure 5) in a well known manner to seal the corner and permanently fasten the end of one spacer -to the adjoining spacer. ~e glass pla-tes are then attached -to the sealed frame.
Various modifications and changes to the cdescribed embodiments will be apparent to those skilled in this art after considering the present disclosure and drawings. All such modifications and changes as fall within the scope of the appended claims are intended to form part of the present invention.

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Claims (20)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A glass insulating sealed unit suitable for a building exterior comprising at least two spaced-apart glass plates and spacer means to join and seal the edge portions of said glass plates arranged about the entire periphery of said plates and between said plates, said spacer means including at least one connecting spacer device extending along at least one side of said unit having a channel-shaped recess that is open along the edge of the unit, connecting means for fastening said sealed unit by means of said spacer device to an adjoining support member which is part of said building, said connecting means having a flat end portion, wherein said sealed unit is fastened to said support member by insertion of said flat end portion into said recess and after the fastening operation the exterior glass surface is the outermost point of the unit and adjacent surrounding surfaces of said building.

2. A sealed unit according to claim 1 wherein said at least one spacer device comprises a first section forming a substantially enclosed, elongate cavity for holding dessicant, said first section being positioned between two glass plates adjacent edges thereof, and a second section in the form of an integral extension of said first section projecting outwardly and not beyond a location directly between the adjacent edges of the glass plates, and a third section in the form of an integral extension of said first section projecting outwardly to and not beyond a location directly between the adjacent edges of the glass plates.

3. A sealed unit according to claim 2 wherein said connecting means comprises a number of flat, elongate metal plates and said flat end portion is part of each metal plate which has a hole therein for passage of a threaded fastener.

4. A sealed unit according to claim 2 wherein said connecting means comprises a continuous L-shaped metal plate along two edges of said unit and said flat end portion is part of one leg of each plate, a hole for the passage of a threaded fastener being formed in the other leg.

5. A sealed unit according to claim 1 wherein said connecting means comprise connectors each of which has a stem portion and two flat arms projecting perpendicularly from one end of said stem portion, wherein each connector is engaged with the spacer device and the adjoining support member when the sealed unit is put in place on the building by rotation of the connector about a centre axis of said stem to turn one of said arms into said recess.

6. A sealed unit according to claim 5 wherein said at least one spacer device comprises a first section forming a substantially enclosed, elongate cavity for holding dessicant, said first section being positioned between two glass plates adjacent edges thereof, and a second section in the form of an integral extension of said first section projecting outwardly to and not beyond a location directly between the adjacent edges of the glass plates, and a third section in the form of an integral extension of said first section projecting outwardly to and not beyond a location directly between the adjacent edges of the glass plate.

7. A sealed unit according to claim 6 wherein each of said second and third sections is bonded to an inside surface of the glass plate closest thereto by a structural sealant.

8. A sealed unit according to claim 6 wherein the end of said stem portion furthest from said arms has locking members extending from opposite sides of said stem portion, said locking members being adapted for fastening said connector to said support member upon said rotation of said connector.

9. A sealed unit according to claim 1 wherein said spacer means includes structural sealant on two opposite sides of said spacer device bonding each of said sides to an adjacent inside surface of a respective glass plate and an elongate strip of compound capable of providing both a dessicant and a vapour seal extending between the glass plates and immediately adjacent to the surface of said spacer device which faces towards the centre of the sealed unit.

10. A sealed unit according to claim 9 wherein said sealed unit is adapted to be held in place and supported on said adjoining support member by being clamped to said support member by said connecting means.

11. A sealed unit according to claim 9 or 10 wherein said compound is a dessicant impregnated compound comprising butyl rubber and polyisobutylene that adheres to the glass plates and is capable of continuing to adhere to either glass plate in the event said structural sealant fails.

12. A sealed unit according to claim 9 wherein said spacer device is generally U-shaped in cross-section and has small longitudinal flanges extending perpendicularly from each of said opposite sides and towards the adjacent glass plate and wherein said elongate strip extends around and covers said flanges.

13. A sealed unit according to claim 12 wherein said compound is a dessicant impregnated compound comprising butyl rubber and polyisobutylene that adheres to the glass plates and is capable of continuing to adhere to either glass plate in the event said structural sealant fails.

14. A building structure including at least two glass insulating sealed units constructed according to claim 9 mounted adjacent to one another, a weather seal extending between and connecting the exterior glass plate of adjacent sealed units, said weather seal having pressure equalization holes formed therein, a mullion frame, and mechanical means for connecting each spacer device of each sealed unit to said mullion frame.

15. A building structure according to claim 14 wherein bar chambers are formed between the sealed units and said mullion frames, each chamber extending along the joint between adjacent sealed units.

16. A building structure according to claim 15 wherein each bar chamber is elongate and is partitioned at the corner of each lite of glass so as to be divided into pressure compartments.

17. A building structure according to claim 14 including air seals mounted between the edges of each sealed unit and the mullion frame, said air seals being located on the side of the inner light opposite the side connected to said spacer device.

18. A building structure according to claim 17 wherein partitioned bar chambers are formed between the sealed units and said mullion frame, each chamber extending along the joint between adjacent sealed units.

19. A sealed unit according to claim 1 wherein connecting spacer devices extend along each side of said unit and said connecting means comprises a separate unitized connecting frame having a hook portion extending about its perimeter on one side of said frame, said hook portion providing said flat end portion which projects into the recess on all sides of said sealed unit.

20. An insulating sealed unit suitable for a building exterior comprising a glass plate, an insulating panel having dimensions lengthwise and widthwise similar to those of said glass plate, and spacer means to join and seal the edge portions of said glass plate and insulating panel arranged about the entire periphery of and between said plate and panel, said spacer means including at least one connecting spacer device extending along at least one side of said unit having a channel-shaped recess that is open along the edge of the unit, connecting means for fastening said sealed unit by means of said spacer device to an adjoining support member which is part of said building, said connecting means having a flat end portion, wherein said sealed unit is fastened to said support member by insertion of said flat end portion into said recess and after the fastening operation the exerior glass surface is the outermost point of the unit and adjacent surrounding surfaces of said building.