Case study · Mercedes-Benz, Leicester
Why a failing frame corner is urgent, and how it is fixed
Car showrooms are built to be looked into. The frontage is as much glass as the structure will allow, in panels far larger than anything on a high-street shopfront, set into slim aluminium frames whose corners carry a surprising amount of load. The bottom corners carry the most: the weight of the panel sits on the sill and the corner piece is what keeps sill and jamb acting as one frame. When that corner deteriorates the frame starts to open at the joint, the glass is no longer held square, and every temperature swing and every gust on the elevation works it further. Left alone, the corner fails and the panel is unsupported along one edge.
At the Leicester dealership the bottom corner had reached that point. It was moments from failure, and the job was booked as urgent maintenance rather than a planned visit. The difficulty is that the repair is hidden behind the very thing it supports: the glass sits in the rebate hard against the corner piece, covering its fixings and loading the joint. The only safe way to refix it is to take the panel out, and a panel this size does not come out by hand.
Taking the load off: the vacuum lifter
The job was planned around a battery-powered glazing robot: a tracked machine small enough to drive through the showroom door and between the cars, with a hydraulic arm and a multi-pad suction head rated to 625 kg. It does not mark the floor, it holds the panel as long as needed, and it sets the glass back with more control than any team of people can. With the lifter positioned inside, the vacuum head was brought up to the glass and the pads locked on. The retaining beads and fixings were released and the machine took the weight, drawing the panel back out of its frame and into the showroom where it stood clear of the opening. The photographs show the scale: a panel taller than the engineer, held upright in the middle of the showroom with the Mercedes graphics behind it.
The bottom corner, refixed with the frame unloaded
With the opening empty and no weight on the sill, the engineer worked from a ladder on the exposed aluminium surround and refixed the failing bottom corner so that sill and jamb are tied together again and the rebate is square and sound. The rest of the surround — the opposite bottom corner and the head — was checked for the same deterioration before anything went back. The panel was then driven back to the opening, offered up square, seated in the rebate and secured, and the lifter released and driven out. A frame that had been moments from letting go was carrying its glass properly again the same afternoon.
A side job: the sliding door handle
While on site we were asked to look at the aluminium pull handle and lock on the sliding door at the side of the showroom. It was a small job next to the frame work. The handle was stripped from the stile, cleaned, re-fixed and tested, which keeps the door usable. It is at the end of its life, and a new handle with a new cylinder has been specified so the door can be brought up to standard on a return visit.
Work completed at Mercedes-Benz, Leicester
- Fault — bottom corner of the aluminium frame round a large showroom glass panel deteriorated to the point of imminent failure; attended as urgent maintenance.
- Plant — battery-powered tracked vacuum glass lifter, 625 kg rated, driven into the showroom between the display cars.
- Removal — panel released from its frame and lifted out on the vacuum head to take the load off the failing corner; held standing inside the showroom.
- Frame — bottom corner refixed from a ladder with the opening clear; remainder of the surround checked for the same deterioration.
- Refit — panel driven back, seated square in the rebate and secured.
- Side job — sliding door pull handle and lock stripped, cleaned, re-fixed and tested; new handle and cylinder specified for a return visit.
- Trading — showroom open throughout; same-day completion.
Urgent showroom glazing and frame repairs across Leicester
Commercial Door Maintenance and Security Ltd works on dealerships and large glazed frontages across Leicester and the East Midlands, from urgent frame and panel work like this to automatic sliding entrances and the handles, locks and cylinders on staff and workshop doors. Where the glass is too big for hands we bring the right machine. If a frame corner on your frontage has opened up or moves when pushed, send a photograph today rather than next month; we will tell you how urgent it is and quote the same day. See our automotive sector page for the other dealership work we have documented.
