I am currently in charge of a project to make a kind of slide to bring packages down or up next to a staircase; It's in industrial areas, knowing that a staircase can have a landing.
My current solution is literally a slide with a small bin where you put the packages.
The tray slides on the sheet metal; I have 1 solution where the user pushes the bin which is driven by a rack.
And my second solution is that the tank is driven by the slide itself is by a buttress effect, the tank cannot go down.
I would have liked to have your opinion on these two solutions and why not if you have others, I'm all for it.
(Bearing in mind that the ascent or descent of the package must be done manually to minimize the cost; the solution must be adaptable to stairs of 35°, 38° and 45°; must be adaptable to a staircase with a landing.)
First of all, I hope you have provided casters or glide pads (in PTFE or equivalent).
The ratchet system is clever but there is nothing to stop it from turning over.
I didn't get the 2nd idea.
How do you think you manage the corners?
Another system could be a linear freewheel, or simply a clamp, closed by a spring, which opens with the user's push (by playing with the lever arms the effort could be "minimal" to counterbalance the spring). The clamp pinches a cable, a flat iron, a rack, to be seen according to the mass on board, the forces allowed, the management of the turns.
My second idea is like when the drawer of a dresser gets stuck, I want to reproduce the same effect. And it is the user by pushing on the lever that unlocks the "convenient" effect and allows the bin to be raised or lowered. AND if the user releases the bin, the effect returns and the bin jams.
I have a doubt about this idea if it's feasible or not :/
I think the trolley should be able to come back or will it have to be put back in place for the ascent??? Because the principle of the hook only works in one direction.
Warning: on the landing phases the stairs do not go down.
This is a point that must be taken into account in my opinion.
However, instead of having the package transit along the entire length of the stairs, isn't it simpler to make a goods lift system with a pulley at the beginning/end of the stairs?
=> The user is at the foot of the stairs, he sets up his load and secures it (chain that goes around, mesh, etc.)
He climbs to the landing of his staircase and retrieves his charge (Rope, chain, ......)
[ My second idea is like when the drawer of a dresser gets stuck, I want to reproduce the same effect. And it is the user by pushing on the lever who unlocks the "convenient" effect ]
This will not be convenient at all because a drawer is made of wood and it does not deform, while a package (often made of cardboard) deforms and in addition if you have several models of packages and well rusks the buttresse no longer works.
In addition, if the user doesn't push the package straight (since it will push aside) you risk that it will also get buttressed on the way up. Users will curse you.
Why not just buy a rack and a sliding gate motor for your system. He will go back and forth, you will fix him under the slide and he will pull the trolley.
AC Cobra, the engine option was rejected because it was too expensive
Zozo, look at the attachment, I was thinking of the bin that buttresses with the slide and not the package;) initial position it blocks (1) and when the user pushes it moves forward (2).
[ I was thinking of the bin that buttresses with the slide and not the package ;) initial position it blocks (1) and when the user pushes it moves forward (2). ]
Well, no! In position 2 it will butt on the other side. Or you have to see in more detail but it's possible but not quite as your diagram represents.
But I have the impression that the problem is not to prevent the package from coming down but to be able to push it to the top without resorting to bodybulder :-)
It's clear that 30kg at 45° plus possible friction, I can imagine the cries of the CHSCT when he goes to see that.
And if, when you do a project, you have to know how to tell the client (whether internal or external) that certain options are absurd (whether from a technical, economic or ergonomic point of view).
In this case, off-center thrust should be banned A solution (not necessarily economical compared to a motor): you can use the ramps of the stairs as a traffic path for the trolley, double the ramps with a rack, a hand pedal system with a well-calculated gear ratio and a controlled freewheel could work.
Safety should not be neglected on this project: if the 30kg starts to hurtle down without control, there will be a death! At the very least, you should provide a parachute system like on elevators.
Let's imagine, my slide is cantilevered by 700mm compared to my staircase which is (at worst) at 45° on a height of 3m (i.e. 6m of linear length).
The user pushes the trolley to the edge of the slide.
The bin that contains the 30Kg package (mass distributed over the entire length of the slide, i.e. 700mm) is positioned on roller rails to limit friction.
How much force will the user need to provide to move the truck?
Attached, I made a little diagram if it can help
Then, I think, with the idea of the counterweight, installing a heavier counterweight (e.g. 5kg) that will help pull the bin that contains the package could be okay, right? you just have to push the tank during the descent to bring the exact tank down?
We must be not far from 2 tubes along the ramp of the stairs, 1 roller wagon on top and a remote control electric winch at not too expensive (car winch type).