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A-FRAME Goes Legal

Posted: Mon Feb 17, 2020 12:57 pm
by westendguzzi
I've converted my old A-Frame to be legal by adding an over-run coupling.
Triking brakes are operated by a Bowden cable going from the hitch 'pull rod' link to the M10 thread on the Triking brake pedal arm. One handed connect/disconnect by reaching into the footwell. (Or I could take the bonnet off but that would take far too long). Brakes also operated by the hand brake, especially when the break-away cable is pulled. Stop limiter adjusted on the handbrake lever to prevent overpull on the cable. The orange strap is to prevent the hitch falling to the ground if detached from the tow car.
Credit to Guy Greaves for developing the Bowden cable and the gland going through the front of the footwell to the brake pedal.
Road test to follow.

Re: A-FRAME Goes Legal

Posted: Mon Feb 17, 2020 2:23 pm
by peakrock
Very ingenious Tony!

I'm tempted to build in a similar type of connection to my brake pedal as I'm still at the bare metal stage with my chassis, pedal box etc.


Re: A-FRAME Goes Legal

Posted: Mon Feb 17, 2020 5:20 pm
by westendguzzi
Much easier to drill the hole in the bulkhead with no body in the way.
No tools needed for fitting/removal of cable.
The lock nut on the adjuster allows quick removal, cable nipple then pulls through the gland.
The nipple holder slips onto cable and screws onto brake pedal M10, one-handed.

Re: A-FRAME Goes Legal

Posted: Tue Feb 25, 2020 4:15 pm
by westendguzzi
Final piece completed, socket for connecting car lights to Triking lights.
The only thing that didn't work was the brake lights. I'd spliced into the green/purple before the brake light switch, not after.

Re: A-FRAME Goes Legal

Posted: Thu Apr 02, 2020 4:21 pm
by peakrock
Hi Tony

I've just fitted the pedal box into my new Type 3 build but had to make a different arrangement on the brake pedal as I'm using a Type 4 pedal box. I'm now considering what brake cable to use and am thinking that an appropriate length trailer brake cable would be a good starting point, is that what you used? It looks like you've used an AlKo coupling - is that right, presumably specced for a low trailer weight? I've been looking around and Knott do one for up to 750KG which is the lowest weight I've found, do you know what yours is rated at? I'm curious as to what that black tube with 2 bolts on the side of the coupling does too?

Regards Dave

Re: A-FRAME Goes Legal

Posted: Thu Apr 02, 2020 7:23 pm
by westendguzzi
You are right about the coupling, AlKo rated 700-1000kg. Perhaps a bit over the top but that seems to be the smallest they do. Relates to the fact that under 750kg does not need brakes. (Civil servant rules)
I didn't come across Knott.
The black angle bolted to the side of the coupling with an adjuster bolt facing forward is a limit for the hand brake lever, it's powered by a gas strut which would put far too much strain on the cable if not limited.
Guy G made up the cable with me just adding the adjuster and nipple at the brake pedal end.

Stay safe. :D

Re: And here’’s One I made earlier!

Posted: Fri Apr 03, 2020 7:03 pm
by SIG 4643
Upon my return to Blighty I resolved to catch up with West End Guzzi on The A frame front. I had already roughed out a design in my head but now had to cut and shape metal in real time. I had already purchased a vastly over rated used ( no thrift was spared) towing hitch and proceeded to cut and weld angle iron to connect it to the chassis. I included a self braking system in the event that the tow bar becomes detached, This is simply operated by the overun brake operating lever being pulled as The A frame angle becomes more horizontal. The front engine mounting nuts were used to prevent the A frame falling too low and hitting the tarmac.
I used Tony’s system of connecting to the vehicle lights but intend to use a simple detachable number plate.

All things considered, I think PC Plod (The Police for our overseas readers) would be hard pressed to find any reason to prosecute,.

I can’t wait to try it out, in the meantime I have already started on my next cunning modification!