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Matt
Matt, Engineer
Category: Engineering
Satisfied Customers: 21373
Experience:  Mechanical Engineering Hons degree, been working in automotive industry for the last 18 years - Engine development engineer
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We have a wall shelf that opens up when 2 magnetic keys

Customer Question

Hi,
We have a wall shelf that opens up when 2 magnetic keys are placed over the locks on the bottom of the shelf.
(I can show it to you).
When the keys are placed over the locks ... they unlock ... and the the bottom shelf opens up exposing a rifle. It's secret hiding spot for guns.
Anyways ... we are looking for a different way to make our shelves lock. Biometric, mechanical...whatever is gives easy and reliable access.
Submitted: 2 years ago.
Category: Engineering
Customer: replied 2 years ago.
Here's a video of the shelf in action as is ... https://www.youtube.com/watch?v=Gzo6Ypvh1HgWe just need a better locking mechanism ... something cool! Yet price effective for us ... and reliable for the user.
Expert:  Matt replied 2 years ago.
Hello
I'd suggest looking at this firms range of 'active latchs'
http://www.servocell.com/
they are all electrically powered but clever in the use of power so that a 9V battery lasts many years
Customer: replied 2 years ago.
Hi Matt ... none of the links on this page work?
Expert:  Matt replied 1 year ago.
Hello
try the casea studies page they all seem to download OK and there are several which should apply
http://www.servocell.com/case_studies.php.html
Customer: replied 1 year ago.
Matt it seems like a magnetic mechanical lock is out best bet for this first batch of shelves. (price wise too)Do you know of a way to basically take this shelf (has 2 locks and 2 keys) ... https://www.youtube.com/watch?v=ssczcbZiF34 ... and engineer it so it still has 2 locks BUT has only 1 main key that activates both locks (on the top/front/center).That's the part we don't get :(
Expert:  Matt replied 1 year ago.
Hello
I'd say its possible to use a variation on the theme of a rotary door latch mechanism so you have 1 magnetic latch in the middle that prevents the centre disc from turning against spring pressure that's trying to turn the disc
then once the magnet is applied it withdraws a pin that allows the disc to turn and so pull back the lock arms on each side
however by the time you've priced all this mechanism up your twin lock / current method may be cheaper
Customer: replied 1 year ago.
Hey Matt,Geeze your smart ... too smart for me ... because I have no clue what you're talking about lol.Few questions to help me out...1. Everything that you mentioned ... can it be bought at the store or online? (we don't want it to be fabricated or custom made ... at least for this first batch)2. If we gave you the dimensions to the shelf ... and showed you a video ... could we hire you to draw up a schematic so we could actually build a demo model here at our office?Jeremy
Expert:  Matt replied 1 year ago.
Hello
OK I'l try to help, 1st thing to ask is how much your magnetic latchs are?
As I think your current design is pretty neat so the driver here has to be to try and save costs over the cost of the current 2 latchs
Customer: replied 1 year ago.
I'm not sure the exact price (my partners sources it) ... and he's not in the office now.I'm thinking pretty cheap 3.50 to 4 bucks per lock and key (so $7 to 8 for the set)
Expert:  Matt replied 1 year ago.
Hello
OK thats going to be pretty difficult to beat
Do you have any other reasons to reduce the number of magnetic latches?
Customer: replied 1 year ago.
No ... we don't want to reduce the amount of latches. We want to reduce the amount of keys. From 2 to 1 ... and from the bottom to the top.We want 2 latches still.But we want both those latches to be RELEASED simultaneously when the "magnetic key" is placed in a central location.
Customer: replied 1 year ago.
Like seen here at the 50 second mark -- https://www.youtube.com/watch?v=ssczcbZiF34(I know in this video they only have 1 lock for the shorter shelf ... but we want 2 for stability/security reasons)
Expert:  Matt replied 1 year ago.
Hello
OK got it
what you need is a method of presenting the magnets to the latches at the same time
If you had a pair of sprung loaded arms with a magnet on each end and your key magnet relased these arms so then active the outer latchs then that would do it
alternatively it may be better to use an electrical system that is triggered by the magnetic key to then release the latches
do you have a budget for the lock system
Customer: replied 1 year ago.
Exactly .... I was thinking of like magnetic rods or bars??? (but I could be way off)1. We don't have a budget for this lock system really .... just the less expensive the better for right now.2. The 1st batch of shelves we want to NOT be mechanical .... as it will take too long and we're in a rush now.(We're definitely open to electrical systems in the very very near future though.)
Customer: replied 1 year ago.
Whoops ... I meant for the 1st batch we want the shelves NOT to be electrical.
Expert:  Matt replied 1 year ago.
OK
if you can let me have some dimensions of the space available and the details of the magnetic latch then I'll try and scheme something up for you
Customer: replied 1 year ago.
I didn't even see this message ... my fault.I don't have dimensions really.We're just looking for a "concept"You could use the 25" long x 12" wide by 2" deepJB
Expert:  Matt replied 1 year ago.
OK
can you provide any details of the latch please?
Customer: replied 1 year ago.
This is the latch/lock we use....https://www.youtube.com/watch?v=iimmriq0QPM
Expert:  Matt replied 1 year ago.
Hello
Ok thanks for the extra information
Sorry to say that I don't think there's a more cost effective method than the 1 you already have as my original idea was to use one of these magnetic catches in the middle to prevent 2 sprung loaded bars from sliding towards the centre
the spring force on the bars would be trying to pull the bars out of the locking holes , so when the centre latch releases the bars sprung out of the their holes and the drawer opens
but by the time you've made bars, some of reset mechanism and paid for springs etc you're better off sticking to the simple 2 lock method you have
I wish you the best of luck with it as its a nice idea
Customer: replied 1 year ago.
We don't care about the costs right now ... can you show me a mock up of what you mean with the 2 bars, etc?
Expert:  Matt replied 1 year ago.
Hello
see here
http://i300.photobucket.com/albums/nn30/350mATT/evo_zpsrwexg4bi.png
Customer: replied 1 year ago.
nothing shows up when I click on the link??
Expert:  Matt replied 1 year ago.
OK
try this one
http://i300.photobucket.com/albums/nn30/350mATT/drwwr%20lock_zpsxrzoabga.jpg
cutting and pasting into the search bar should do it
Expert:  Matt replied 1 year ago.
Hi
do you still need help?