Gasket mounting

Bonded installation

Double glazed hopper windows use the core principles of the single glazed product but with the aluminium profiles increased in size to accommodate the increased thickness of the double glazed unit.

Like its single glazed counterpart, the double glazed hopper can also be either rubber gasket mounted or bonded to the vehicle through a choice of applicable outer frame extrusions as shown on the cross-sectional drawings.

Significant to the design however are the varying methods of glass retention which give the end user various options re maintenance and reglaze in the event of the glass unit being damaged.

The wedge system utilises the patented Beclatite rubber profile to hold the double glazed units within the framework but allows the glass to be removed from the exterior of the vehicle without removing the window from the bodyside. It also has the advantage of not requiring materials with a shelf-life hence the cost of repair is constant and unaffected by curing times when compared to bonding.

Alternatively if a flusher external appearance is re q u i red then the bonded unit installation method can be purchased. Within this design the bottom double glazed unit is stepped along the crossrail thus ensuring that both panes of the double glazed unit are bonded to the framework, whilst allowing the unit to be removed from the exterior of the vehicle without removing the window from the vehicle.

In similar fashion the hopper vents can be individually removed from the outer frame for the reglazing function to be performed in a controlled environment.

The accompanying cross-sectional drawings show that a positive drainage path exists in both designs local to the double glazed unit, in order to achieve an acceptable warranty period against breakdown of the double glazed unit seal.

Maintenance procedure
All mechanisms, hinges and rubber seals must be regularly checked for wear and cleaned and lubricated as required. Drainage slots and channels should be checked regularly and kept clear of obstructions. All framework and glass must be cleaned with a non-abrasive cleaner.