[SML] Remotely actuated floor locks

[Jerry Durand]

On your cam, look into a SEAR as used in gun triggers.  Can hold a LOT
of force and takes little force to release it.  Really simple to make,
here's all the parts from an 1858 pistol

http://lameclan.altervista.org/blog/wp-content/uploads/2011/06/remington-2.jpg

The sear is on the bottom of the trigger.  You can see a notch and a
step to it's right just under that small hole.  The notch is for
"half-cock" and the step is the full cock position.  The very top of the
trigger snaps into this when the hammer is pulled back.  The hammer
rotates around the large hole.

Note the size of the sprint on the hammer, this is a significant force
yet the trigger pulls quite easily yet locks solid when it's cocked.

For the trap application, a spring rotates the "hammer" into cocked
position which holds the trap shut.  For safety the air cylinder slides
under the trap as a dead bolt but doesn't carry any load.  To open, the
air cylinder retracts and when clear of the trap it pulls the trigger
releasing the sear.


On 01/12/2015 09:40 AM, Joe D via Stagecraft wrote:
> To report back about my findings on floor locks; I did not find any commercial product that would be totally appropriate.  However, I did get fairly close with the Parker P5T Series of linear air actuators.  They do have load ratings for side loads on the rod, up to 150 in-lbs of torque.
>
> Speaking with the boss, as the pricing was starting to become significant, decided we have more time than money right now, so we will be making our own.  I will design some sort of cam design, like what you see on typical floor locks on industrial work carts. This is so that I can gang several floor locks with one actuator.
>
> Now I have to brush up on my vector math to calculate the forces.
>
> Joe Dunfee
> jdunfee12 at yahoo.com
> 305-999-1759
>
>

-- 
Jerry Durand, Durand Interstellar, Inc.  www.interstellar.com
tel: +1 408 356-3886, USA toll free: 1 866 356-3886
Skype:  jerrydurand