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Gallery, Projects and General => The Design Shop => Topic started by: Will_D on March 10, 2017, 06:18:31 PM

Title: 3 point Linkage crane
Post by: Will_D on March 10, 2017, 06:18:31 PM
This is primarily aimed at the farmers here!!

I have a nice green Deutz tractor (with soft turf tires for use in the rugby club).

It has a full 3 point linkage for the various attachments - Ok no problermo

So my wacky MM idea is:

How to design a structure that mounts on the 3 point and probably the main hitch that could user the movement of the 3 point lifting arms to create a crane effect?

Would be nice to vary lift reach and lifting capacity with a set of holes.

Yes it has hydraulics but now we expensive!!

I really want a set of articulated levers that will transition the 3 point lift to a say 2,3,4 times lift!
Title: Re: 3 point Linkage crane
Post by: sparky961 on March 10, 2017, 08:13:26 PM
Probably not a solution to your issue, but in looking at linkages myself recently I came across this neat video that might provide some inspiration.

Title: Re: 3 point Linkage crane
Post by: John Hill on March 10, 2017, 10:07:40 PM
Hi,  Google 'Ferguson Crane' and you will find many pictures of what you have in mind.
Title: Re: 3 point Linkage crane
Post by: efrench on March 10, 2017, 10:08:18 PM
Rugby must be a pretty rough sport if tractors are allowed  :doh:
Title: Re: 3 point Linkage crane
Post by: awemawson on March 11, 2017, 02:30:15 AM
There are two designs that I've seen. The first is a simple gallows shape with the lift entirely provided by lifting the linkage arms. The second is essentially a conventional engine crane mounted on the three point linkage with the hydraulic cylinder operated off a spool valve on the tractor rather than a hand operated pump.

Title: Re: 3 point Linkage crane
Post by: Joules on March 11, 2017, 04:37:40 AM
Rugby must be a pretty rough sport if tractors are allowed  :doh:

Only for removing the dead.
Title: Re: 3 point Linkage crane
Post by: catceefer on March 11, 2017, 05:01:25 AM
I am not sure whether it will help, but this free software programme is good for designing and testing linkages, such as a crane. It also has several examples. I am using it to draw up some linkages for a rolling-ball clock.

http://blog.rectorsquid.com/new-linkage-3-4/ (http://blog.rectorsquid.com/new-linkage-3-4/)

Regards,

James.
Title: Re: 3 point Linkage crane
Post by: awemawson on March 11, 2017, 06:16:50 AM
Here are the two designs that I mentioned
Title: Re: 3 point Linkage crane
Post by: Will_D on March 11, 2017, 09:13:55 AM
Many thanks guys.

Must get scratching out a design in Fusion 360

Having just planted 36 apple trees in the club grounds I think a 3 point, PTO powered apple planter should be next!!

If all my grafts take then its 60 apples and perry pears next year.

PS: Anyone on here make Perry?