Motobecane moped fork lock

[John]

I have a 1979 Motobecane moped. It has a neimanlock for fork lock could someone tell me the mechanics of this lock and how it operates

 

[The Sock]

When key is turned the little doohickey arrowed moves into line with the ridge on the lock. The whole thing is then pushed inwards, the key returned to its normal position and removed. The doohickey now holds the lock in, with the tip engaged with the cutout in the steering tube.
Steering is now locked, until the key is re-inserted and the procedure reversed.

It may be the poor quality of the image, but the doohickey looks damaged.

 

[John]

Thanks for info is there any direction on how to install new one came with spring,split washers and metal retaining clip direction I have are in french

 

[John]

When key is turned the little doohickey arrowed moves into line with the ridge on the lock. The whole thing is then pushed inwards, the key returned to its normal position and removed. The doohickey now holds the lock in, with the tip engaged with the cutout in the steering tube.
Steering is now locked, until the key is re-inserted and the procedure reversed.

It may be the poor quality of the image, but the doohickey looks damaged.


View attachment 57737

Thanks for info I need direction the new lock is all in French it came with spring split washer and locking clip for top how do I get it all back together

 

[Dellortoman]

I dunno whether you should be working on a Motobecane if you can't read French

My French is a bit rusty. I had to look up a couple of words, but here's my version of an English translation. I suspect one of our froggy members like Paul Marx could do a better job.

1. Place circlip 1 in housing 2 so that the gap in the circlip faces the groove in the housing. (Fig A)

2. Push the circlip 1 into the back of the housing using lock 3 (Fig B)

3. Remove the lock and fit the small end of conical spring 4 over the end of the lock. Press the lock and the spring into the housing (fig C)

4. Secure the lock with the stirrup-shaped clip 5 (fig D)

That stirrup shaped retaining clip doesn't look familiar to me. I'm wondering if Laverdas use a different method to hold the lock in place. Some kind of pin or screw rings a bell. Sorry, I'm a bit vague on that because it's been many years since I disassembled one of those locks.

I suspect Mr Sock may be right. The doohickey (pin) on your lock appears to be sheared off, which can happen if the lock is removed with violence.

 

[Paul Marx]

I dunno whether you should be working on a Motobecane if you can't read French

My French is a bit rusty. I had to look up a couple of words, but here's my version of an English translation. I suspect one of our froggy members like Paul Marx could do a better job.

1. Place circlip 1 in housing 2 so that the gap in the circlip faces the groove in the housing. (Fig A)

2. Push the circlip 1 into the back of the housing using lock 3 (Fig B)

3. Remove the lock and fit the small end of conical spring 4 over the end of the lock. Press the lock and the spring into the housing (fig C)

4. Secure the lock with the stirrup-shaped clip 5 (fig D)

That stirrup shaped retaining clip doesn't look familiar to me. I'm wondering if Laverdas use a different method to hold the lock in place. Some kind of pin or screw rings a bell. Sorry, I'm a bit vague on that because it's been many years since I disassembled one of those locks.

I suspect Mr Sock may be right. The doohickey (pin) on your lock appears to be sheared off, which can happen if the lock is removed with violence.

Well done.
The pin shears when somebody tries to force the locked steering I think.

Paul

 

[CLEMTOG]

they brake far too easilly, I left TOG in Crowborough one night after too many beers, went back the following day and realised that I had not brought the keys, my chaufeur would not have wanted a double trip, so.....I sat on the bike and braced myself, with both feet on the handlebars and gave the steering a jolt, it broke and that was that, it is still like it, 30 years or more later, starting a BTZ bike without a key is simplicity itself, if you can lift the side hinged seat, you get all the functions of self starter and full lighting as well, the lock for the seat on mine had already fallen out, but I have seen Chad Valley items that are stronger ,not saying how the non key start works here, just in case
CLEM

 

[Dellortoman]

I once jumped on my bike, started it and took off without disengaging the steering lock. The steering was already pointed in the direction I wanted to go so I didn't realise it was locked until I tried to straighten up. The bike and I ended up on the ground before I knew what had happened.