Parcel Delivery System Challenge Entry

grabcad

***** 3/13/15 - I've added an updated .igs model called "PCP_Complete_15g_aluminum_sheet-NEW.IGS" where I changed the sheet metal dimensions of the metal parts to 15 gauge aluminum sheet. The overall mass of the device is much lighter, but still sturdy and strong. I made the appropriate dimensional changes where necessary to make sure all the parts and components were still able to fit together properly. I also made the brackets that secure the drawer solution to the face of the cabinets a bit larger and moved those security screw holes over so that there would be more meat of the cabinet for them to secure on to. ***** Here's my entry for the Parcel Delivery System Challenge. I'll update this bad boy in a bit. *** I added a video...it's actually pretty long 15min (it looks like it's gonna end at about the 1/2 way mark but it continues, so keep watching) but its what i was able to put together quickly. It's pretty dark in the beginning (compression screwed it up) but lightens up after a bit. I'll see about redoing it, but for now just wanted to give the Cleveron guys something to watch on their way to work. VIDEO MAIN POINTS: 1) Using either a solenoid or an electromagnetic lock by themselves will not work. Using them together with a time delay relay does work and is an inexpensive way to provide a strong and fail secure system 2) Using just .025" and .015 " ( top cover) thick aluminum sheet metal the device performed well under load and mild stress. Anything thing between 12-18 gauge sheet metal will perform much better and as intended. 3) Existing and inexpensive full extension drawer slides can be used provided they are slightly tweaked to prevent tampering and work as the drawers need to. 4) Simple one-way security screws and rivets can be used to assemble the mechanisms together and prevent tampering 5) The top cover springs work well to provide the necessary force to push the drawer out under load and stress as well as allow the top cover to slide and move independent of the actual drawer which should prevent parcels from jamming the system.*** Ok, so I actually took this challenge as an opportunity to build something. I had a few ideas and really just wanted to put some theories to the test using the cheapest stuff I could find. I banged out the model in about a week, having finished it yesterday. I made a couple of videos that I will be posting up here so everyone can get a good idea of how it operates (there are quite a few things going on with it). Main Points: - Sheet metal construction 12-18 gauge held together by rivets (.25-.375x.125) steel type and one-way security screws (the ones the put in bathrooms to prevents folks from removing the doors) - Electronics: Delay time relay, ON-ON Switch (for unlocked/locked indication, electric solenoid lock, electromagnetic lock (the two devices used together provide a cheap "FAIL SECURE" method of operation in the event of a total system and/or power failure ***note that just a solenoid lock won't do as they won't open when there is any pressure on them****), 6 pin Molex Micro Fit 3.0 connectors -Anti-Tampering: Rivets and one-way screws used for construction in places where tampering is possible, also used to secure drawer solution to terminal cabinet. Drawer slides have been easily modified to prevent removal by the cutting off of the release tab. Technicians however can easily remove the drawers as necessary using a simple device that slips onto their thumbs. - Interference prevention: Bottom: The bottom of the enclosure that houses the drawer extends underneath and almost the width of the drawer front itself. The drawer front bottom is cut at a slight angle just to make sure that it can easily overcome and slide over the extending part of the housing bottom. This design prevents anything below the drawer from catching onto the drawer front. Top: The sliding top cover slides independently of the drawer itself and is the device that actually provides the force to open the drawer once the locks are released. This design coupled with the housing design mentioned above eliminates the contents of this drawer interfering with anything above it. At the sames time this design also allows the drawer to be opened in the event that an over-sized or expanding item were placed with the drawer Other: drawer slides have also been modified to remove the rubber stopper part to allow the drawers to easily slide without putting added tension on the spring mechanisms that release the drawer. I think that covers it, if there's anything I missed, I'll post it here.