Hatch Design

[zakk]

I tried starting this thread in the Gear Forum with no response so I will try this one... I am design a hatch the locks with a mechanism similar to a bank vault, i.e. having a centrally located hand wheel which when turned advances a series of radial pins outward. I am not sure how the gear arrangement inside the hatch should be designed (if it is gears or some other mechanism). A series of sample photos from the twenties can be viewed from the following link. It shows very well what I am trying to descibe above, but on a larger scale.

http://www.clev.frb.org/bicenten/door.htm

If anyone has any insight or links to information, regardless of how general, all would be appreciated.

 

You don't need gearing if a diaphragm style mechanism would give you enough pin movement.

 

[Philrock]

There are many ways to design a mechanism that will do this. You can use a combination of any of the following: gears, pins, levers, links, bell cranks, threads, cams. One important consideration is whether or not the pins need to exert any force. In other words - are they acting just as latches, or are they also drawing the hatch cover into close contact with the opening? pdr@baymachinedesign.com

 

[zakk]

Thanks ornery norsk & Philrock.

O.N.: I have not seen anything like a "diaphragm style mechanism" unless it is called something else. Do you have any details?

Philrock: The pins seen minimal force as they move outward. They will be under signicant shear loasding once the hatch comes under pressure.

I realize that there is a great number of ways to approach this, but I was curious if anyone had any details on the inner workings of the specific design on the web link. I am basically doing a little 'legwork' now on diffenent design approaches already available without having to reinvent the wheel.

 

[MikeMech]

There are a few companies I am familiar with that manufacture such hatches for the marine industry. They are Centex, Railway Specialties Corp., and Juniper Industries. Check out their diagrams, I think most are just variations on 4 bar linkages .

http://www.railwayspec.com/

http://www.juniperind.com/