Happijac leg

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TonyS
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Joined: June 28th, 2015, 3:45 pm
Location: Newmarket / Cambridge

Happijac leg

Post: # 7079Post TonyS
July 10th, 2015, 4:05 pm

Wanted - HAPPIJAC 4150. damaged, bent, seized, rusted with/without motor, condition unimportant as I am looking to totally refurb and keep as a spare.. Tony

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zildjian
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Re: Happijac leg

Post: # 7084Post zildjian
July 10th, 2015, 6:48 pm

Out of interest Tony, what typically needs attention on these?

TonyS
Posts: 26
Joined: June 28th, 2015, 3:45 pm
Location: Newmarket / Cambridge

Re: Happijac leg

Post: # 7086Post TonyS
July 10th, 2015, 7:53 pm

I honestly don't know, Zildjian, its all a bit of a learning curve to me at the moment. I just thought that it may be a good idea to have a spare ready to bolt on in the case of failure, rather than be temporarily out of business. I also love dragging things back to my lair and pulling them to bits :twisted: It will be interesting to see if any of the internal parts are available off the shelf in the uk..

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zildjian
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Re: Happijac leg

Post: # 7089Post zildjian
July 10th, 2015, 8:14 pm

I did read a strip down on these some years back, I think it was on Woodalls

might be some clues, I'll re-read through myself as well

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zildjian
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Re: Happijac leg

Post: # 7090Post zildjian
July 10th, 2015, 8:16 pm


TonyS
Posts: 26
Joined: June 28th, 2015, 3:45 pm
Location: Newmarket / Cambridge

Re: Happijac leg

Post: # 7092Post TonyS
July 10th, 2015, 8:54 pm

Ah.. Thats very interesting. . . plenty of info there. Thanks

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derestrictor
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Re: Happijac leg

Post: # 7215Post derestrictor
July 16th, 2015, 9:35 am

On these though, from an engineering perspective at least, they probably all get made the same way with that huge threaded bar through the middle

somebody could make those I would imagine, but how best to attach a gog to the top end to mesh with with another at right angles, would a weld be good enough or would you need to put a pin right through it?

TonyS
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Joined: June 28th, 2015, 3:45 pm
Location: Newmarket / Cambridge

Re: Happijac leg

Post: # 7222Post TonyS
July 16th, 2015, 4:36 pm

At a casual glance, the threaded rod down the middle looks very similar to the Lead Screw on a lathe, if it is, it would be available as a stock item somewhere. . . I would imagine that the bevel drives are either, as you say, pinned to the shaft with a roll pin or taper pin, or they may be keyed and grub screwed. . . . I can't wait to conduct a post mortem :twisted: . . . one of my four electric legs is slightly faster than the other three, maybe its been fitted with a racing screw or a high performance motor. . .or both. .

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derestrictor
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Re: Happijac leg

Post: # 7269Post derestrictor
July 18th, 2015, 8:01 pm

this might be the moving core inside a happijac leg or at least something like it


Image

http://www.ebay.co.uk/itm/3-8-12-ACME-D ... 20fe88f106

TonyS
Posts: 26
Joined: June 28th, 2015, 3:45 pm
Location: Newmarket / Cambridge

Re: Happijac leg

Post: # 7279Post TonyS
July 19th, 2015, 10:48 pm

It does look very similar. . . the thread in the jack must be fairly close pitch in order to take the strain off the electric motors and to give a more controlled lift.

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