# Patent

## Title
Glass laminate system and methods for hockey rinks

## Abstract

A transparent, shatter-resistant glass shield for mounting atop the dasher board of a hockey rink includes at least one glass panel. A glass-retaining plastic film is adhered to a surface of each glass panel. The plastic film substantially covers the surface. An edge retainer may be mounted on at least one edge of the glass panel.

## Background
RELATED APPLICATIONS
This is a continuation application of U.S. patent application Ser. No. 10/356,241, filed Jan. 31, 2003, which is a continuation-in-part application of U.S. patent application Ser. No. 09/919,480, filed Jul. 31, 2001, which issued as U.S. Pat. No. 6,761,641 on Jul. 13, 2004, the disclosures of which are hereby incorporated by reference in their entireties. The present application further claims priority through U.S. patent application Ser. No. 10/356,241 from Canadian Patent Application No. 2,388,228, filed May 30, 2002, the disclosure of which is hereby incorporated herein by reference in its entirety.


FIELD OF THE INVENTION
The present invention generally relates to protective glass barriers for hockey rinks and, more specifically, to a shatter-resistant glass shield including a tempered glass panel with a transparent plastic film laminate adhered thereto.
BACKGROUND
Modern ice hockey rinks include glass barriers comprised of transparent glass panels encircling the rinks above the dasher boards. These glass panels protect spectators from flying pucks and debris, and assist the dasher boards to contain flying pucks while still permitting a relatively unobstructed view of the hockey action on the ice by spectators. The glass panels are typically constructed of thick, tempered glass. In more modern “seamless” glass barriers, the glass panels are supported side-by-side in a groove along the top of the dasher boards. Adjoining glass panels are clipped together at their top corners by metal brackets. Older glass barriers include mullions mounted to the dasher boards between the panels for supporting the panels. Seamless glass barriers are preferable because they permit a full, virtually unobstructed view of the ice and hockey game.
Unfortunately, when a player or a flying puck impacts these glass barriers with sufficient force, the glass can shatter into thousands of small fragments. Typically, these pieces are roughly oblong and, and approximately one-half (1⁄2) to one (1) inch long. Violent impacts with the glass can cause glass shards to rain down on players and officials on the ice and on nearby spectators in their seats. These glass projectiles create the possibility of skin lacerations and serious eye injury. Sports arena owners and operators cannot ignore the danger to the safety of participants and spectators at hockey games.
In addition to these safety issues, the shattering of the glass panels creates clean-up problems. Cleaning up shattered glass is an arduous task. Maintenance personnel must carefully locate and remove thousands of glass particles that have fallen to the ice and floor and slid under seats or other surrounding objects. It is difficult if not impossible to know whether each and every piece has been cleared from the ice or from spectator areas. If anyone slips and falls on an overlooked piece, serious injury can result. Also, even if some portions of the shattered glass do not fall to the ice or floor during breakage, they likely will during replacement operations.
Finally, the shattering of glass can have a major, outcome-determinative effect on the tempo of a hockey match. By the time broken glass is cleaned up and replaced, a team can easily lose its focus and momentum.
Others have attempted to address this problem in various ways. Tempered glass is typically used in ice hockey arenas instead of ordinary plate glass. Although tempered glass has superior strength over ordinary plate glass, breakage still occurs. In addition, to maximize the strength of the glass panels bordering the most critical portions of the hockey rink near the goals, five-eighths (5⁄8) inch thick panels are used. The less critical glass panels along the sides of the rink are typically only one-half (1⁄2) inch thick. The 5⁄8 inch glass panels flex very little when struck by players or pucks. Hockey players dislike the thicker 5⁄8 inch panels because their rigidity causes colliding hockey players more pain than the more flexible 1⁄2 inch panels. Also, the more rigid 5⁄8 inch panels can cause more concussions to colliding players than the more forgiving 1⁄2 inch glass panels. In addition, the 5⁄8 inch panels are approximately seventy five (75) pounds heavier than the 1⁄2 inch panels. Because many hockey arenas are also multi-use facilities, the heavier 5⁄8 inch panels make the oft repeated breakdown and reassembly of the glass barriers more difficult for workers. Therefore, it is desirable to have shatter-resistant glass barriers for hockey rinks that are constructed entirely of the lighter and more flexible 1⁄2 inch glass panels.
Also, U.S. Pat. No. 5,897,438 to Kunz et al. discloses a modular rink assembly that may include plexi-glass panels mounted atop the sideboards and end boards. Though plexi-glass panels are more shatter-resistant than tempered glass panels, plexi-glass is much more easily scratched than tempered glass. Over time, accumulated scratches on plexi-glass panels affect the transparency of the panels, and impair the view of the hockey action for spectators and television cameras. Therefore, it is desirable to have a shatter-resistant transparent barrier for hockey rinks which is also scratch and scar resistant.
None of the above solutions seek to restrain glass particles from dismantling from a glass barrier once the inevitable breakage occurs. Also, apparently no prior art solutions have targeted broken glass retention systems in a retro-fit manner to decrease the hazardous potential of broken glass.
SUMMARY OF THE INVENTION
According to embodiments of the present invention, a transparent, shatter-resistant glass shield is provided for mounting atop the dasher board of a hockey rink. The glass shield includes at least one glass panel having a front surface, a back surface, and a plurality of edges. A glass-retaining plastic film is adhered to a surface of each glass panel such that the plastic film substantially covers the surface of each panel. Preferably, the plastic film is polyethylene terephthalate (P.E.T) or polycarbonate, has a thickness of about 0.014 inch, and includes three plastic layers. At least one edge retainer is engaged on an edge of each glass panel such that the edge retainer extends over substantially the full length of the engaged edge of the glass and overlaps the plastic film. The edge retainer portions preferably are channels constructed of transparent polyvinyl chloride. The glass panel is preferably rectangular, and may include radiused corners at its top to assist in mounting the glass shield atop the dasher board. To further support the glass, an additional plastic film may be applied to at least a portion of a second surface of the glass.
According to embodiments of the present invention, a transparent, shatter-resistant glass shield for mounting atop the dasher board of a hockey rink includes at least one glass panel, where each glass panel has a front surface, a back surface, and a plurality of edges. A glass-retaining plastic film is adhered to a surface of each glass panel, where the plastic film substantially covers the surface. At least one edge retainer is engaged on an edge of each glass panel. Each edge retainer extends over substantially the full length of the edge and overlaps the plastic film along the edge. The plastic film and edge retainers on a panel assist in the retention of a substantial portion of broken glass after breakage of that panel.
According to further embodiments of the present invention, a protective barrier for a hockey rink includes a dasher board section having a top rim, a support groove in the top rim, and a plurality of glass support members spaced incrementally along the top rim. A plurality of transparent, shatter-resistant tempered glass panels are engaged in the support groove and supported by and between the incrementally spaced glass support members. Each glass panel includes a rectangular glass plate having a back surface, a top edge, a bottom edge, and first and second side edges. A glass-retaining plastic film having one or more plastic layers is adhered to the back surface of the glass plate. The plastic film extends substantially from the top edge to the bottom edge and from the first side edge to the second side edge of each panel. A plurality of transparent edge retainers are engaged on the top and side edges of the glass plate. The edge retainers extend over substantially the full lengths of the top and side edges, and the edge retainers overlap substantially the full lengths of the edges of the plastic film along the top and side edges. The plastic film and edge retainers assist in the retention of a substantial portion of a glass panel after breakage of the panel.
According to further embodiments of the present invention, a shatter-resistant glass shield includes a tempered glass panel having a front surface, a back surface, and peripheral edges. Transparent plastic film having one or more plastic layers is adhered to the rear surface, the front surface, or both the rear and front surfaces of the glass panel. Adhesive adheres the plastic film to the glass panel. A plurality of transparent retention channel portions are engaged on at least some of the peripheral edges of the glass panel and overlapping the plastic film along these edges. The adhesive has sufficient properties so that a substantial portion of the tempered glass will remain adhered to the plastic film upon breakage. The retention channel portions together with the plastic film retain the broken glass along the peripheral edges such that the glass panel remains substantially in one piece upon breakage.
According to further embodiments of the present invention, a system for improving the shatter resistance of a glass panel surrounding a hockey rink includes a plastic film including at least one plastic layer and having substantially clear optical properties. The plastic film is of suitable size to substantially cover a surface of the glass panel and is suitable to be adhered to a surface of the glass panel. A plurality of edge retainers are suitably sized and configured to be engaged on edges of the glass panel and a portion of the plastic film that is adhered to a surface of the glass panel. The plastic film and edge retainers can be assembled to the glass panel and assist in the retention of a substantial portion of broken glass after breakage of the panel.
According to method embodiments of the present invention, a method of improving the shatter resistance of a glass shield for a hockey rink includes providing a glass panel suited for mounting atop a hockey rink dasher board and having a front surface, a back surface, and top and side edges. A substantial portion of any surface dirt or particles is removed from the back surface. A plastic film having one or more plastic layers and having substantially clear optical properties is provided. The plastic film sheet is adhered to the back side of the glass. Transparent retainer channel portions sized and shaped to fit substantially along the top and side edges of the glass panel are provided. The retainer channel portions are assembled along the top and side edges of the glass panel such that the channel portions overlap the plastic film.
According to further embodiments of the present invention, a transparent, shatter-resistant glass shield for mounting atop the dasher board of a hockey rink includes at least one glass panel. A glass-retaining plastic film is adhered to a surface of each glass panel. The plastic film substantially covers the surface. The plastic film has a thickness of at least about 0.014 inch.
According to further embodiments of the present invention, a protective barrier for a hockey rink includes a dasher board having a top rim. At least one transparent, shatter-resistant glass shield is mounted on the top rim of the dasher board. The glass shield includes at least one glass panel. A glass-retaining plastic film is adhered to a surface of each glass panel. The plastic film substantially covers the surface. The plastic film has a thickness of at least about 0.014 inch.
According to further embodiments of the present invention, a transparent, shatter-resistant glass shield for mounting atop the dasher board of a hockey rink includes at least one glass panel. A glass-retaining plastic film is adhered to a surface of each glass panel. The plastic film substantially covers the surface. The plastic film has a thickness of at least about 0.014 inch. The glass panel has a thickness of no greater than about 3⁄8 inch.
According to further embodiments of the present invention, a protective barrier for a hockey rink includes a dasher board having a top rim. At least one transparent, shatter-resistant glass shield is mounted on the top rim of the dasher board. The glass shield includes at least one glass panel. A glass-retaining plastic film is adhered to a surface of each glass panel, the plastic film substantially covering the surface. The plastic film has a thickness of at least about 0.014 inch. The glass panel has a thickness of no greater than about 3⁄8 inch.
These and other aspects of the present invention as disclosed herein will become apparent to those skilled in the art after a reading of the following description of the preferred embodiments when considered with the drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an environmental view of a corner portion of a hockey rink dasher board including glass panels according to the present invention;
FIG. 2 is an exploded view of a glass panel assembly for a hockey rink according to the present invention;
FIG. 3 is a partial section view of an edge of the glass panel assembly of FIG. 2;
FIG. 4 is a cross section of the glass panel of FIG. 2;
FIG. 5 is a cross section showing a preferred embodiment of the glass panel of FIG. 2;
FIG. 6 is a cross section showing an alternative embodiment of the glass panel of FIG. 2;
FIG. 7 is a front view of the glass panel of FIG. 2 mounted on the dasher board of a hockey rink; and
FIG. 8 is a cross section of the assembly of FIG. 7 taken along line AA.



DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the relative sizes of regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present.
FIG. 1 illustrates a corner portion of a hockey rink dasher board including a system of shatter-resistant glass panels according to the present invention. The dasher board 70 shown in FIG. 1 is typical of dasher boards used in modern ice hockey rinks. The complete dasher board bounds an entire oval rink, and is typically comprised of a series of panels that extend about 3.5 to 4 feet above the surface of the ice. The dasher board forms a boundary around the ice to contain players, pucks, and debris within the field of play. The glass panels 10 are mounted atop the dasher board 70 to form a continuous transparent barrier to further contain players, pucks, and debris within the field of play. The transparent panels 10 shield spectators from flying pucks and debris while permitting a virtually unobstructed view of the ice and hockey game by spectators. The transparent panels 10 are typically tallest around the ends of the rink behind the goals and are often shorter along the less-critical sides of the rink.
FIG. 2 is an exploded view of a shatter-resistant, tempered glass panel assembly 10 illustrating an embodiment of this invention. A glass panel 12 is constructed of tempered glass, and is preferably about 1⁄2 inch thick. The shatter-resistant glass panel assembly 10 has an overall thickness of about 1⁄2 inch, and is suitable for installation both along the sides and ends of a hockey rink, permitting lighter, more flexible panels to replace the thicker, more rigid 5⁄8 inch panels typically used along the ends of hockey rinks near the goals. The glass panel assembly 10, however, may have a thickness greater than 1⁄2 inch if desired. A typical glass side panel 12 for a hockey rink is about seventy five (75) inches tall by about forty eight (48) inches wide. For a “seamless” glass barrier, the glass panel 12 typically includes a cutout at each top corner 13 as shown in FIG. 2 to assist in connecting adjoining panels. In a preferred embodiment, the cutouts have a radius of about 1⁄2-inch. The illustrations of the glass panels 12 shown in FIGS. 2–8 are intended to represent conventional tempered glass panels like those commonly used in hockey rinks today.
A plastic film 14, 15 is also shown in FIG. 2. The plastic film may be a single-ply film 14, but preferably is a multi-ply film 15 having a plurality of plastic layers. In a preferred embodiment, the multi-ply film 15 includes three plastic layers. The film 14, 15 is cut and shaped to cover substantially one surface of the glass panel 12 from edge to edge. Placing the film 14, 15 on the back surface (spectator side) is preferred to avoid marring of the plastic film by pucks, hockey sticks, or the like. Also, placing the film 14, 15 on the back of the glass panel 12 acts to contain any loose shattered glass particles on the ice side of the glass panel 12. Nevertheless, the film 14, 15 could also be applied to the front surface (ice side) of the glass panel 12 in an alternative embodiment. The plastic film 14, 15 is adhered to the glass panel as discussed in detail below. Preferably, the thickness of the film 14, 15 is substantially uniform. The plastic film 14 or 15 preferably has an overall thickness of at least 0.014 inch.
As also seen in FIG. 2, edge retainers 16 are assembled and adhered along the top and side edges of the glass panel 12 after the plastic film 14, 15 is adhered to the back surface. As best seen in FIG. 3, the edge retainers 16 preferably are U-shaped channels that engage the aligned edges of the glass panel 12 and adhered plastic film 14, 15. The channels can be adhered in place to the edges of the glass panel and plastic film by a two-part epoxy adhesive. In addition, the channels may be constructed of resilient material such as polyvinyl chloride (PVC) and may be sized to resiliently engage the edges of the glass panel and plastic film. The edge retainers 16 aid in retaining the glass and adhered plastic film 14, 15 together at their edges when the glass panel 12 is shattered. When the tempered glass panels 12 are impacted by a concentrated blow such as the impact of a hockey puck, the energy imparted to the glass at the point of impact radiates through the glass panels to their edges. Without the edge retainers 16, this radiating energy may cause the free edges of the glass panels to rapidly shatter and seemingly “explode” outwardly from the side and top edges. The edge retainers 16 reinforce the edges of the glass and work in combination with the film adhesive to keep the glass connected to the film 14, 15, thereby preventing shattered glass from exploding out the top and side edges upon impact. Preferably, the edge retainers 16 are constructed of transparent polyvinyl chloride (PVC). The edge retainers 16 are sized and shaped to firmly engage the edges of the glass panel 12 and adhered plastic film 14, 15. This retention system also stabilizes the shattered glass panel for removal and replacement such that standard suction cup systems for handling glass can be used.
FIGS. 4–6 are cross sections of various embodiments of the glass panel 12 and adhered plastic film 14, 15. FIG. 4 illustrates a single-ply plastic film 14 mounted on a tempered glass panel 12. The back surface 20 of the glass panel 12 faces the spectators when the glass panel assembly 10 is mounted in a hockey rink. The plastic film 14 in this embodiment is comprised of a film-to-glass adhesive layer 24 and a single-ply plastic layer 22 having a desired thickness.
FIG. 5 illustrates a preferred three-ply plastic film 15 having an overall thickness of about 0.014 inch. This preferred embodiment includes a film-to-glass adhesive layer 30, a first plastic layer 31, a first interstitial adhesive layer 32, a second plastic layer 33, a second interstitial adhesive layer 34, and a third plastic layer 35. The plastic layers 31, 33, and 35 typically are comprised of a polymerized ethylene resin such as polyethylene terephthalate (P.E.T.). Alternatively, polycarbonate films may be used. In the preferred embodiment, the outermost plastic layer 35 has a scratch resistant coating 40 applied to its outer surface. This coating protects the film during cleaning and maintenance.
FIG. 6 illustrates another alternative embodiment which is the same as the embodiment of FIG. 5 except an additional plastic film 50 is applied to the front surface 21 (ice side) of the glass panel 12. A plastic layer 54 is adhered to the front surface 21 by an adhesive layer 52. This additional plastic layer 50 further strengthens the glass panel, assists the first plastic layer 15 to retain shards of broken glass, and particularly aids in preventing glass particles from falling onto the ice. A scratch resistant coating 60 may be applied to the exposed surface of the plastic layer 54.
The film-to-glass bonding adhesive 24, 30, or 52, in a preferred embodiment, is already applied to the plastic layer 22, 31, or 54 when the plastic film is obtained from a film supplier. The adhesive 24, 30, or 52 is exposed by removing a release liner (not shown) prior to application to the glass 12. The adhesive must have sufficient bonding strength so that the majority of the glass particles will remain bonded to the film 14, 15 after breakage. Also, the adhesive must be substantially optically clear to not distort the existing clarity of the glass 12. In a preferred embodiment, the adhesive is selected from the following group: acrylic copolymer pressure sensitive adhesive; an acrylic-vinyl acetate pressure sensitive adhesive; or a vinyl ether polymer pressure sensitive acetate adhesive. Adhesive density typically is approximately fourteen (14) pounds per ream. After application, the adhesive layer typically consumes no more than 1 mil of thickness. The film-to-film laminating adhesive 32 and 34 shown in FIGS. 5 and 6 also must be substantially optically clear, and can be formed from the following: acrylic copolymer pressure sensitive adhesive; an acrylic-vinyl acetate pressure sensitive adhesive; or a vinyl ether polymer pressure sensitive acetate adhesive. Laminating adhesive density typically is seven (7) pounds per ream. Suitable suppliers of pressure sensitive adhesives and scratch resistant coatings include National Starch & Chemical Corp. Ashland Chemical Co., and Morton International, Inc.
Plastic film 30, 50 of the type used herein can be obtained from many suppliers of safety and security film, such as Clear Defense Incorporated, 121 E. Main St., Martinsville, Va. Preferred properties for the plastic film and the PVC channels and epoxy adhesive are as follows:







TABLE







FILM PROPERTIES










Color
Clear



Number of Film Layers
   3



Laminate Thickness (including
   0.014 (335)



adhesive) inches (microns)



Tensile Strength-PSI
28,000



Break Strength-lbs/inch
  350



Peel Strength-lbs/inch
   7







PVC CHANNEL AND EPOXY PROPERTIES










Color
Clear



Elongation
75%



Tensile Strength
1850 psi



Hardness (ASTM D 2240) Shore D
83



Peel strength (Bonds cured 24 hrs. @



Room temp + 2 hrs. 160 F.)



Bonds tested at:



−67 F.
 2 piw



+70 F.
13 piw



+120 F.
15 piw



Overlap Shear Strength vs. Temp.



Bonds tested at:



−67 F.
3000 psi



+70 F.
3500 psi



+120 F.
 750 psi



Worklife
3–4 minutes










The above film, PVC channel, and epoxy materials were selected because they have been found to provide an excellent combination of strength, durability, and transparency. Other materials that have similar properties may also be used. The tensile and break strength values above were measured in accordance with the following standards: ASTM D 882-75 (American Society for Testing Materials); ASTM 1004-76; ASTM D 1938-67. The lbs/inch values above are per linear inch of width.
FIGS. 7 and 8 illustrate a plurality of glass panels 10 according to the present invention mounted on a dasher board 70 of a hockey rink to form a “seamless” transparent protective barrier. The glass panels 10 are arranged side by side in a groove 76 along the top edge of the dasher board 76 such that the plastic film 14, 15 faces the spectators. A plastic film 50 as shown in FIG. 6 can be included on the front face (ice side) of the glass for added protection. The panels have a gap 74 between their adjacent edges which is about three-tenths ( 3/10) of an inch wide. Triangular brackets 72 (e.g., formed of plastic, PVC, or metal) align and retain the glass panels 10 together at their upper corners. These brackets engage cutouts at the top corners 13 of the glass panels 10 shown in FIG. 2. The present invention is also suitable for use in older “non-seamless” glass barriers which include mullions mounted on the top edges of the dasher boards between each glass panel to support the glass panels.
A manual method of applying plastic film 14, 15, or 50 to a tempered glass basketball backboard is disclosed in detail in U.S. Pat. No. 5,902,198, to Martin et al. at column 5, line 25, through column 7, line 62. The disclosure of that patent is hereby incorporated by reference. The same process may be used for applying the plastic film to glass panels for hockey rinks, and can be used for either existing hockey rink glass panels or for an OEM installation.
The invention can be applied in a retro-fit situation on any type of dasher or glass system. The glass panels are first removed from the groove of the dasher board and placed on a rolling A-frame glass handling device for cleaning and preparing the glass to receive the plastic film. The preferred three-ply, 14 mil plastic laminate is cut to fit the entire spectator side surface of each glass panel and is manually adhered to the glass using the same technique described in the above-referenced patent. After the plastic film is applied to the glass, the clear PVC channel molding is cut to the lengths of the two vertical side and top edge of each glass panel. The bottom edges of the glass panels do not receive the PVC channel molding because they are engaged in a groove in the top of the dasher board which provides adequate glass/film reinforcement at the bottom edge of the glass panels. The PVC channels are slid onto the top and side edges such that the channels clip over the edges of the glass and plastic laminate. The channels are adhered in place by a two-part epoxy adhesive. The channel molding prevents chipping of the edges and corners of the glass panels during handling. Also, if a glass panel is broken during play or handling, the channel molding prevents the shattered glass from exploding out the top or sides of the glass panel.
The manual process described above can also be used for an OEM installation. In a preferred OEM installation, however, the process of applying the plastic film laminate to the glass is done by a cold laminating process line including a machine or machines without the use of slip solutions and manual application tools. This machine application utilizes proper glass washing equipment, cold lamination, and film-to-glass lamination equipment with precise web tension and nip roller pressure controls in a clean room environment. The machine lamination process provides a very clear panel with a well-anchored plastic film.
After the plastic film is adhered to a glass panel by one of the above methods, the PVC retainer channels are installed on the top and side edges of the panel as described above. A sticker may be applied to the unlaminated side of the glass panel to aid in properly orienting the laminated panel during installation in a hockey rink such that the laminated side faces the spectators and the unlaminated side faces the ice. The plastic film must face the spectators to provide maximum protection against shattered glass caused by an impact to the ice side of the glass.
While glass shields including a glass panel and a plastic film having a thickness of preferably at least about 0.014 inch, and more preferably of about 0.014 inch, are discussed above incorporated into a system including edge retainers, such glass shields may also be used without edge retainers as described herein. In particular, glass shields including a glass panel having a thickness of about 1⁄2 inch and a plastic film having a thickness of at least about 0.014 or of about 0.014 inch may be used independently of the edge retainer system.
In accordance with further embodiments of the present invention, a further glass shield having the following characteristics may be provided for use on a dasher board of a hockey rink. The further glass shield includes a glass panel and a glass-retaining plastic film as discussed above, except as follows. Except as noted below, the glass shield is preferably constructed as discussed above, with the same preferred and suitable materials, configurations, methods of assembly, applications, modifications and the like. However, the glass shield has a thickness of no greater than about 3⁄8 inch and the plastic film has an overall thickness (including all layers and adhesive) of at least about 0.014 inch. Preferably, the plastic film has a thickness of between about 0.014 inch and 0.028 inch. Suitable films of 0.014 inch to 0.028 inch thickness for the glass shield as just described are available from Clear Defense Incorporated, 121 E. Main St., Martinsville, Va. According to certain preferred embodiments, the film is a six-ply film and has a total thickness (including adhesive) of about 0.028 inch (665 microns), a tensile strength exceeding 28000 PSI, a break strength exceeding 500 lbs/inch, and a minimum peel strength of 5 lbs/inch.
It has been found that glass shields as just described provide satisfactory strength while also being more flexible and lighter. As discussed above, flexibility and weight reduction may provide significant benefits, particular with respect to player safety and handling costs/time.
The glass shield as just described may be employed in place of the panels 10 in a system of the present invention such as the system described with reference to FIG. 1. The glass shields as just described may be used with or without edge retainers of the present invention; however, it will be appreciated that such edge retainers will provide the aforementioned advantages when employed with such reduced thickness glass shields. It is particularly contemplated that glass shields as just described having a glass panel thickness of no more than 3⁄8 inch may be used along the sides of a rink, with the glass shields 10 having a glass panel thickness of 1⁄2 inch being used on the ends of the rink. It is also contemplated that glass shields having glass panel thicknesses of no more than 3⁄8 inch may be used along both the sides and the ends of a hockey rink.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention. Therefore, it is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the invention.

## Claims

1. A method for forming a protective barrier for a hockey rink, the method comprising:
forming a glass shield, including:
(a) providing a glass panel suited for mounting atop a hockey rink dasher board and having a front surface, a back surface, and top and side edges;
(b) removing a substantial portion of any surface dirt or particles from the back surface;
(c) ensuring that the back surface is substantially dry;
(d) providing a plastic film having one or more plastic layers and having substantially clear optical procedures;
(e) adhering the plastic film sheet to the back side of the glass;
(f) providing transparent retainer channel portions sized and shaped to fit substantially along the top and sides of the glass panel; and
(g) assembling the retainer channel portions along the top and side edges of the glass panel such that the channel portions overlap the plastic film;
(h) wherein the plastic film comprises a plastic film having one or more plastic layers, an adhesive layer and a release liner, and the step of adhering the plastic film comprises:
wetting the back surface of the glass panel with an aqueous solution;
removing the release liner from the plastic sheet;
applying the plastic film to the back surface, so that the adhesive layer contacts and bonds to the back surface;
forcing a substantial portion of the aqueous solution out from between the back surface and plastic film; and
allowing the plastic film and back surface to dry.

2. The method of claim 1 further including mounting the glass shield on a rim of a dasher board.

3. A protective barrier for a hockey rink, said protective barrier comprising at least one transparent, shatter-resistant glass shield, the glass shield including:
(a) at least one glass panel, wherein each glass panel has a front surface, a back surface, and a plurality of edges, at least one of the plurality of edges being a free, top edge;
(b) a glass-retaining plastic film adhered to a surface of each glass panel, wherein the plastic film substantially covers the surface;
(c) at least one edge retainer engaged on the free, top edge of each glass panel, wherein each edge retainer extends over substantially the full length of the free, top edge and overlaps the plastic film along the free, top edge, wherein the plastic film and edge retainers on a panel assist in the retention of a substantial portion of broken glass after breakage of that glass panel; and
(d) a dasher board having a top rim, wherein the glass shield is mounted on the top rim of the dasher board;
(e) wherein:
each glass panel has opposed side edges and a bottom edge;
the at least one edge retainer engages and extends over substantially the full length of each of the side edges; and
the bottom edge is disposed within the top rim of the dasher board.

4. The protective barrier of claim 3 wherein the at least one edge retainer is formed of polyvinyl chloride (PVC).

5. The protective barrier of claim 4 wherein the at least one edge retainer is transparent.

6. The protective barrier of claim 3 wherein the at least one edge retainer includes a channel having a U-shaped cross-section and engages each of the front and back surfaces of the glass panel.

7. The protective barrier of claim 3 wherein the at least one edge retainer is transparent.

8. The protective barrier of claim 3 wherein the plastic film has a thickness of about 0.014 inch.

9. A protective barrier for a hockey rink, said protective barrier comprising:
(a) a dasher board having a top rim;
(b) at least one transparent, shatter-resistant glass shield mounted on the top rim of the dasher board, the glass shield including:
at least one glass panel; and
a glass-retaining plastic film adhered to a surface of each glass panel,

wherein the plastic film substantially covers the surface; and
(c) at least one edge retainer engaged on an edge of each glass panel;
(d) wherein the glass panels are rectangular and the plurality of edges of each glass panel includes a top edge and first and second side edges; and
(e) wherein a first edge retainer is engaged on the top edge, a second edge retainer is engaged on the first side edge, and a third edge retainer is engaged on the second side edge of the glass panels.

10. The protective barrier of claim 9 wherein the plastic film has a thickness of about 0.014 inch.

11. The protective barrier of claim 10 wherein the plastic film is comprised of a plurality of plastic layers.

12. The protective barrier of claim 9 wherein each glass panel is tempered glass.

13. The protective barrier of claim 9 wherein the plastic film further comprises a scratch resistant coating adjacent to the plastic layer.

14. The protective barrier of claim 9 wherein the plastic film is adhered to the back surface of each glass panel.

15. The protective barrier of claim 14 wherein at least one additional plastic film is applied to at least a portion of the front surface of each glass panel.

16. The protective barrier of claim 9 wherein each glass panel further includes a first 1⁄2-inch radiused corner between the top edge and the first side edge, and a second 1⁄2-inch radiused corner between the top edge and the second side edge, wherein the first and second beveled corners assist in mounting the glass shield around a hockey rink.

17. The protective barrier of claim 9 wherein the edge retainers are channels having a U-shaped cross-section.

18. The protective barrier of claim 9 wherein the edge retainers are substantially transparent.

19. The protective barrier of claim 9 wherein the edge retainers are constructed of polyvinyl chloride.

20. The protective barrier of claim 9 wherein the edge retainers are adhered to the glass panel and plastic film along the engaged edges of the glass panels.

21. The protective barrier of claim 9 wherein each glass panel has a free, top edge and at least one of the edge retainers is engaged on the free, top edges of each glass panel.

22. The protective barrier of claim 9 wherein each of the edge retainers extends over substantially the full length of the respective edge of the glass panels.

23. A protective barrier for a hockey rink, said protective barrier comprising:
(a) a dasher board having a top rim;
(b) at least one transparent, shatter-resistant glass shield mounted on the top rim of the dasher board, the glass shield including:
at least one glass panel; and
a glass-retaining plastic film adhered to a surface of each glass panel,

wherein the plastic film substantially covers the surface; and
(c) wherein each of the glass panels has a thickness of about one-half inch.

24. The protective barrier of claim 23 wherein each glass panel is tempered glass.

25. The protective barrier of claim 23 wherein the plastic film further comprises a scratch resistant coating adjacent to the plastic layer.

26. The protective barrier of claim 23 wherein the plastic film is adhered to the back surface of each glass panel.

27. The protective barrier of claim 26 wherein at least one additional plastic film is applied to at least a portion of the front surface of each glass panel.