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Martin Hewitt's Questions

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MartinHewitt

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Post Fri Jan 06, 2017 12:46 am

Martin Hewitt's Questions

I think it makes sense to open a thread for my detail questions where (it seams) nobody has an answer. In case I find an answer I will update my post.

Martin hewitt
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MartinHewitt

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Posts: 352

Joined: Sat Nov 26, 2016 6:19 pm

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Post Fri Jan 06, 2017 12:49 am

Difference La Gard 1985 and 3390?

What is the difference between a La Gard 1985 and a La Gard 3390 which makes the first a group 1 and the second a 2M? On photos of the internals they look very similar. Both seem to have the fence lever control device aka tomahawk. (Patent US4756176) I would like to understand why one is 1 and the other 2M.

Answer: The mechanism is the same, but the manufacturing quality of the 1985 is better. I.e. the fence lever control device, its cam pin and the cam are made of metal. An additional difference is that the cam radius around the cam gate is smaller. This mean that the FLCD is pulling down the lever outside the cam gate, but the lever nose is still not getting in contact with the cam.
Last edited by MartinHewitt on Fri Jan 20, 2017 10:43 pm, edited 1 time in total.
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MartinHewitt

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Post Fri Jan 06, 2017 12:51 am

Difference S&G FAS 6880 and 6890?

What is the difference between a S&G GAS 6880 and a 6890 which makes one a EN1300 class B and the other a class C? Both have 9 levers and use the same key. From I quick glance I did not recognize a difference. I will look tomorrow more closely. So perhaps I have then the answer.

1. Ad.: I put both next to each other. I really cannot see any significant difference. The direction of the levers was different, but the 6880 was certainly opened before and I am not sure of the direction (left/right) or the spring was the original order. Probably this does not make any real difference anyway. It might be that the levers have a better precision in the 6890, but I can't really see this. It might also be that it is just a marketing issue.
Last edited by MartinHewitt on Fri Jan 06, 2017 12:46 pm, edited 1 time in total.
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MartinHewitt

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Posts: 352

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Post Fri Jan 06, 2017 12:59 am

Why so many S&G combination lock models?

This is probably not a technical, but a marketing question. I do not understand why they have so many models. E.g. there are three different mechanisms sold to protect group I locks. (The 8410 with the small twisting knob. The 8550 with the push dial. The 6430 or so with the wider lever and the bar at the tip.) And there are zillion other variants. The vault locks with a completely different layout. The a bit less secure locks with the silver lever. The radiological protected locks. ... This must make the production more expensive. So why not cut it down?
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MartinHewitt

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Posts: 352

Joined: Sat Nov 26, 2016 6:19 pm

Location: Germany

Post Fri Feb 03, 2017 9:22 pm

Why works the Kromer 3011 combination lock without change in

The Kromer 3011 doesn't have a change index, but is changed on the normal index. On locks like the S&G 6730 the lever would fall into the cam gate. Why does it work with the Kromer?

Answer: Here the answer together with the question, because when I disassembled it I saw the difference. The first wheel of the Kromer has a lever, which is pushed out to cover the wheel gate, when the change key is turned. It is a nice convenience mechanism, but I believe the weight distribution of the wheel is more imbalanced with this lever.

This lock oozes quality. The dial is milled out of a solid block of aluminum. The lock case is made of steel. And the contact points are really soft. I expect a manipulation to be rather difficult.
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