I have a latch design problem and need your help - many years in software engineering aren't helping me much here!
Two pieces of 60x30mm RHS become parallel/adjacent (on the 60mm face), with a 5mm gap, via a pivoting motion between two sub-structures. A rotary latch is installed into the bottom piece of RHS and a pin/striker in the top piece engages into the latch. All works well but this is just the initial latching mechanism to allow the user to engage a stronger mechanism - which is what I need help with: designing/choosing a suitable latch.
Firstly, it will need to hold a large force - 2275kg if I take the 7:1 leverage ratio and x2.5 safety factor into account. If this is wildly optimistic, I can use one on either side to halve that requirement. Secondly, it must be able to pull the two pieces of RHS into near perfect alignment as the rotary latch has 2-3mm of free play. There can be no free play at all once the secondary latch mechanism is engaged.
Any ideas? I attach a drawing of my current best idea - a lever laser-cut from 10mm steel plate, with a small bend, rotating on a shoulder bolt which goes through both 30mm faces of the top piece of RHS. Currently shown in the engaged position. Turning it 180 degrees anti-clockwise will disengage it. The bend is to allow it to pull the top piece into alignment before securing it. In case it isn't clear, the top piece of RHS will pivot down from top left to bottom right in the diagram (the direction the pin is pointing) and the rotary latch/striker ensure it cannot move further in this direction.