Drawer solution

grabcad

Hi everyone! Here is the idea i have been working for a few days now but will need some time to develop it in detail. All is shown on two pictures. There is a back spring which serve to open the drawer by required 30mm by a Force3. The friction force(from friction in rails guides or oversized package friction) Force2 act on the drawer when opening. If this Force2>=Force3 the drawer will not open. There is a front plate attached to the drawer trough front spring. And there is a switch between front plate and the drawer itself. Basic principle: to close the drawer someone need to apply a Force1 to the front plate. Force1 is equal to Force2. The front spring is calibrated in such a way that when Force1 exceed(when oversized package) the small amount needed to close the drawer in normal conditions(no jamming), the electric switch on the front plate send the signal to control unit, which action the lock on the driver back side. The front spring force < the back spring force always. Instead of front spring + front plate switch a load cell can be used. The lock on the drawer back ican be used both for block it when oversized package is inserted and to close the drawer. I will add some renderings and CAD files soon.Will continue to develop the design. Ok. Now I aded a 3d model and a few renderings. I am using a gas spring(1.23$ for 500 pieces) to open the drawer te first 30mm. The barell lock coupled with the car door lock actuator(4$ 1 piece) serve to lock te drawer and in same time block the drawer with the use of the toothed rack when too big package is inserted. Limit switches are used. One to signal the state of the barrel lock, another one, just under the gas spring, to signal that the drawer is in closed position and the can be locked. One of the possible issues with this design is the moving cable with the drawer. The current solution is to fold the cable in two on the left side of the drawer and let it fold and unfold as the drawer move. The cable will therefore simply laying on the roller runner frame top. Ivan P.S. Like so many other participants i didn't had enough time to present my design as i wanted with fully explanatory renderings. The design presented in 3D files is the final and possess some features which are not seen in renderings files,as for example the drawer complete extraction solution with hided low cost locking mechanism.