Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
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design elements
Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
design
technical
The Arden System ‘A’ (including A38D and A50D) family of patch fitting assemblies was designed to fulfil a number of roles, replacing a range of components with a single unified fixing system. In staircase and balustrade projects, fixings are often required between a variety of materials within a single installation, e.g. nogging to handrail, concrete to glass, stanchion to handrail and glass. By applying an integrated system of components, a uniform design style is maintained throughout the entire project.
Glass used in balustrade systems typically falls into one of two groups, either structural glass or infill glass, and it is important to understand the loads on these glass panels when selecting a particular patch fitting to mount the glass.
Arden has selected a clean and geometric style for components in the System A patch fittings, reflecting the modern trend appropriate for the vast majority of projects. Visually characterised by precision fit cylinders with fine bevels, the A38D / A50D family purposefully avoids extraneous geometry. Depending on the character of the surrounding materials, the system can either present a functional feature of the project, or recede visually without distracting from surrounding architectural features. Most patch fittings are available in either 38mm or 50mm diameter clamps. The 38mm option is suitable for smaller spans or lower design loads when a lighter and more slimline appearance is required. This option is recommended by Arden for most residential projects. By covering a greater area, the 50mm version offers greater structural support to each point fixing. It is suitable for large spans and high design loads, and is often specified in commercial projects.
a) Infill glass applications Infill glass, as the name suggests, is designed to simply be an infill in a balustrade run. It is assumed that the primary loads of the balustrade are applied to the handrail, and that this handrail is structurally independent of the glass balustrade, and derives support from a stanchion of similar structural item. In this situation, one only needs to consider the loads for infill glass as defined under AS1170.12002 (Structural design actions) and these loads are typically much less than that which apply to structural glass. Suitability of a particular patch fitting for infill purposes is then dependant upon the area of the glass supported and the number and relative position of the patch fittings. In common infill balustrade systems, typically 25mm diameter through to 38mm diameter fittings based on an M10 fitting bolt are adequate in most applications. These include the R38D patch fittings described on page 9 of this document.
b) Structural glass applications Structural glass in balustrade applications is that which carries the entire balustrade load onto the glass, including the handrail loads. Typical applications of using patch fittings to achieve a structural glass carrying of handrail loads involves the use of an upper and lower series of patch fittings that hold the base of the glass panel to the structural element (e.g. the void edge or the stair stringer) to thereby form a cantilever effect of the glass that then extends up to carry the balustrade handrail and therefore the balustrade loads.
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In this typical application, the glass panel becomes a lever that transmits loads by way of compression and tension to the upper and lower series of patch fittings. The actual load that is imparted onto the fitting is determined by: a) The design load to the balustrade (as defined by AS1170.1) b) The horizontal spacing of the patch fittings that then determines that amount of load is shared by each patch fitting pair c) The height of the handrail above the top series of patch fittings d) The separating distance between the upper and lower series of patch fittings.
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Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
All of these factors combine to determine the load that each fitting must then be able to accept. The choice of patch fitting then involves consideration of the following points. 1) The size of the fitting bolt to structure that resists the tension and compression loads of each fitting 2) The area of the point load applied to the glass by the patch fitting. Whilst every application can be subtly different, typical configurations for a C3 balustrade load are patch fittings with a vertical separation of around 200mm and a horizontal spacing of around 450mm, requiring a 50mm diameter glass bearing area and a base fixing bolt of M12. Arden A38D and A50D patch fittings have been specially designed to suit these loads and application, with the design limiting factor being the base fixing bolt. In other words, the fittings themselves are tested to ensure that they can cope with more compression and tension than the M12 fixing bolt can carry back to the base structure. As a long-time consumer of third party patch fittings, Arden was compelled to design its own range of patch fittings, due to the fact that available components paid little consideration to the structural requirements. For example, many fittings rely upon a threaded embedment of a threaded base pin into the button top of the fitting. As the button top has limited depth, this often results in only two of three treads (2 to 3 mm) holding the button cap to the structural base fixing bolt, which then becomes the weak point of the structure. Arden fittings are different in that the top fitting cap provides full thread for the cap depth plus the thickness of the glass, thereby ensuring a thread binding of at least the diameter of the bolt (12mm). By using a full structural binding between cap and base fixing bolt, the design limit of the system becomes the bolt itself rather than the fitting. Arden patch fittings are a full multi-application system with the addition of various parts to provide remarkable flexibility for numerous applications, as shown on the following pages.
Figure 1 31 8
30
1A. Front and side elevations 1B. Isometric 1A
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A38D patch fitting body with 30mm offstand. Configuration is typically used for cantilevered glass fixings to concrete, LVL or other structural bodies in domestic applications.
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1C. Exploded
1
1B
1C
design elements
3
A50D stanchion wing to glass and handrail connection. Patch fitting assembly with mounting pin and handrail support pin assembly. Typical application is for mounting on stanchion systems such as the W4 (see brochure) in a commercial context, simultaneously bearing glass and handrail loads.
86 8
8
79
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Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
Figure 2
2A
2A. Front and side elevations
2
2B. Isometric 2C. Exploded
2B
2C
Figure 3 A38D patch fitting body with 8mm back nut. Typically used for glass fixings to stanchion posts in domestic applications.
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9
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3A. Front and side elevations 3B. Isometric 3C. Exploded
3A
3
3B
3C
Figure 4
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A38D stanchion blade to glass connection. Includes slotted body without back nut. Typical application is for supporting glass panels from stanchion blades in domestic applications.
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21
8 38
M12x1.75 - 6H
4A. Front and side elevations 4B. Isometric
4A
4C. Exploded
4
4B
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4C
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30
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A38D solid body offstand with back nut. Configuration is typically used for cantilevered glass fixings to concrete, LVL or other structural bodies in domestic applications where a larger offset is required. 5A. Front and side elevations
5A
5B. Isometric 5C. Exploded
5
5B
5C
Figure 6 A38D glass to handrail connection. Used for frameless cantilevered glass systems (such as F8) in domestic applications.
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76
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6A. Front and side elevations 6B. Isometric 6C. Exploded
6A
6
6B
Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
Figure 5
39 8
6C
Figure 7 29 8
8
20
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7A. Front and side elevations
7A
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A38D stanchion blade to glass connection. Includes slotted body and back nut. Typical application is for supporting glass panels from stanchion blades in domestic applications where a larger offset is required.
10
7B. Isometric 7C. Exploded
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7B
7C
design elements
5
86
A38D stanchion wing to glass connection. Includes patch fitting assembly with mounting pin. Typical application is for mounting on winged stanchion systems such as the W4 (see brochure) in a domestic context, bearing a glass panel from a stanchion wing.
8
8
38
8A
8A. Front and side elevations 8B. Isometric 8C. Exploded
8
8B
8C
Figure 9 86
79 8
8
10
9A. Front and side elevations
38
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A38D stanchion wing to glass and handrail connection. Patch fitting assembly with mounting pin and handrail support pin assembly. Typical application is for mounting on stanchion systems in a domestic context, simultaneously bearing glass and handrail loads.
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Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
Figure 8
9A
9B. Isometric
9
9C. Exploded
9B
Figure 10
8
A50D patch fitting body with 8mm back nut. Typically used for glass fixings to stanchion posts in commercial applications.
9C
9 8 50
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10A. Front and side elevations 10B. Isometric 10C. Exploded
10A
10
10B
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10C
A50D patch fitting body with 8mm back nut and 38D/30mm offstand body. Typically used for frameless glass fixings in commercial applications.
50
38
8
11A. Front and side elevations 11B. Isometric 11C. Exploded
11A
11
11B
11C
Figure 12 76
8
A50D glass to handrail connection. Used for frameless cantilevered glass systems (such as F8) in commercial applications..
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50
12A. Front and side elevations 12B. Isometric 12C. Exploded 12A
12
12B
Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
Figure 11 39 8 30
12C
Figure 13 29
10
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A50D stanchion blade to glass connection. Includes slotted body and back nut. Typical application is for supporting glass panels from stanchion blades in commercial applications where a larger offset is required.
50
13A. Front and side elevations
13A
13B. Isometric 13C. Exploded
13
13B
13C
design elements
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A50D stanchion wing to glass connection. Includes patch fitting assembly with mounting pin. Typical application is for mounting on winged stanchion systems such as the W4 (see brochure) in a commercial context, bearing a glass panel from a stanchion wing. 14A. Front and side elevations
86
8
50
14A
14B. Isometric 14C. Exploded
14
14B
14C
Figure 15
15A. Front and side elevations
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86 50
16
A50D stanchion wing to glass and handrail connection. Patch fitting assembly with mounting pin and handrail support pin assembly. Typical application is for mounting on stanchion systems in a commercial context, simultaneously bearing glass and handrail loads.
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Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
Figure 14
15A
15B. Isometric 15C. Exploded
15
15B
15C
Figure 16
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R38D patch fitting cover nut with 30mm offstand for M10 connection/ fixing. Typically mounted on blade stanchions in domestic situations where high potential loads are not expected.
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10
16A. Front and side elevations 16B. Isometric
16A
16C. Exploded
16
16B
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16C
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R38D patch fitting cover nut with 38mm offstand for M10 connection/ fixing. Typically used for cantilevered glass balustrade in domestic situations where high potential loads are not expected.
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17A. Front and side elevations 17B. Isometric
17A
17C. Exploded
17
17B
17C
Figure 18
13
61
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R38D handrail mount: bent version. For handrail mounted off M10 through-glass patch-fitting fixing. 18A. Front and side elevations 18B. Isometric 18C. Exploded
18A
18
18B
Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
Figure 17
18C
Figure 19
66
50
R38D handrail mount: mitred version. For handrail mounted off M10 through-glass patch-fitting fixing. 19A. Front and side elevations
19C. Exploded
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19B. Isometric
19A
19
19B
19C
design elements
9
47
Wall mounted handrail support. Typically located on nogging or other behind-plaster support.
10
57
67
50
20A. Front and side elevations 20B. Isometric
16
20C. Exploded 20A
17a
20B
20C 17b
Figure 21
17c
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A
27
44 square light duty clasp style patch fitting suiting 8-10mm glass. Typically employed on flatbar or SHS stanchion posts. 21A. Side detail
21C. Top detail
44
21B. Back detail 44
Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
Figure 20
21D. Isometric 21E. Exploded
A 21B
27
8-10
21A
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21C
21D
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21E
16d
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Appendix 1 – A38 / A50 system ‘A’ patch fittings and clasps
About this document
compliance Arden is a BSA licensed contractor for carpentry, joinery, glass, glazing and aluminium as well as structural metal fabrication and erection. Arden supplies a Form 16 (Licensed Contractor) on all projects. In design and construct contracts, a Form 15 (Design Engineer) certification is supplied upon request. Please see specific product technical data sheets to check level of compliance with relevant codes and standards.
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design note For all commercial applications, it is important that sufficient space for the stairwell cavity be allowed to satisfy Australian Standards and BCA requirements. The footprint is primarily driven by the floor to floor rise, as well as the staircase configuration chosen. However, stringer and balustrade style design may increase the amount of space required. Allowing too small a cavity can restrict the design options of the staircase. Also, points at where the staircase interacts with other structures are best addressed early in the design cycle. Consultation with Arden early on will help ensure that these design issues can be addressed in a cost-effective manner.
design elements
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