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DaBraink
Samba Member
Joined: August 12, 2005
Posts: 172
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 Posted: Sat Jun 25, 2016 7:40 pm Post subject: Fulcrum type floor jack |
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Is this a factory VW jack? If so was one made for busses?
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mandraks
Samba Member
Joined: November 28, 2004
Posts: 7047
Location: Lawrenceville, Ga
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| Posted: Sat Jun 25, 2016 8:19 pm Post subject: Re: Fulcrum type floor jack |
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interesting piece, never seen one
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Malokin Martin
Samba Member
Joined: August 19, 2007
Posts: 3099
Location: E-burg
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| Posted: Sat Jun 25, 2016 9:37 pm Post subject: Re: Fulcrum type floor jack |
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| Oh man I want one of those |
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easy e
Samba Member
Joined: May 28, 2008
Posts: 3931
Location: 1 hr north of Santa Barbara
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| Posted: Sat Jun 25, 2016 10:44 pm Post subject: Re: Fulcrum type floor jack |
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Maybe that was the one used before they decided it might be better to have one that would stow easier.... and impress Archimedes a little more.
I'm sure you could make one for a bus... might be a little cumbersome.
"Give me a lever long enough and a fulcrum on which to place it, and I shall move the world."
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DaBraink
Samba Member
Joined: August 12, 2005
Posts: 172
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| Posted: Sat Jun 25, 2016 11:03 pm Post subject: Re: Fulcrum type floor jack |
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It would be hard to carry around but really quick to use.
I wonder if this was used at the factory and also what the opening at the top was for, a tie down?
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BarryL 
Samba Member
Joined: November 01, 2004
Posts: 14257
Location: Casa de Oro, California
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| Posted: Sun Jun 26, 2016 9:27 am Post subject: Re: Fulcrum type floor jack |
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| Ahem...that replaced the harpoon...nothing VW; you ought to see the pole and reel. |
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DaBraink
Samba Member
Joined: August 12, 2005
Posts: 172
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| Posted: Sun Jun 26, 2016 2:08 pm Post subject: Re: Fulcrum type floor jack |
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The reason it appears to be a tool is the end nearest the vehicle has what appears to be a rod going into the jack point. That, with its length, would suggest it could be used to lift the vehicle.
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nlorntson
Crazy VW Lady
Joined: March 13, 2004
Posts: 3783
Location: Twin Cities, MN
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| Posted: Sun Jun 26, 2016 2:50 pm Post subject: Re: Fulcrum type floor jack |
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I think that would only work on a car with the round jack hole like a KDF or very early beetle?
Would be slick for a quick tire change or valve adjustment  |
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EverettB
Administrator
Joined: April 11, 2000
Posts: 69802
Location: Phoenix Metro
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| Posted: Sun Jun 26, 2016 9:57 pm Post subject: Re: Fulcrum type floor jack |
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I'm curious what sort of force would be needed to lift the vehicle.
I'm no fulcrum expert but if you need 1000 lbs. of force and that long arm is 5' and the short one is 1' it looks like 200 lbs of force.
That seems a bit high for a normal user so maybe my math is off.
Or it's not 1000 lbs of lift needed.
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velvetgreen
Samba Member
Joined: August 17, 2004
Posts: 2744
Location: Canada
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| Posted: Mon Jun 27, 2016 6:04 am Post subject: Re: Fulcrum type floor jack |
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| well if it isn't a jack then it sure could double for braking by being used as an anchor. storing it in the vehicle might be a issue however |
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easy e
Samba Member
Joined: May 28, 2008
Posts: 3931
Location: 1 hr north of Santa Barbara
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| Posted: Mon Jun 27, 2016 6:18 am Post subject: Re: Fulcrum type floor jack |
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| EverettB wrote: |
I'm no fulcrum expert but if you need 1000 lbs. of force and that long arm is 5' and the short one is 1' it looks like 200 lbs of force.
That seems a bit high for a normal user. |
Maybe not an expert, but you're correct.
In general the effort force can be expressed as
Fe = Fl (dl / de)
where
Fe = effort force (what we're solving for)
Fl = load force (say 1,000 lb)
dl = distance from load force to fulcrum (say 1 ft)
de = distance from effort force to fulcrum (say 5 ft)
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Abscate
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Joined: October 05, 2014
Posts: 22639
Location: NYC/Upstate/ROW
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| Posted: Mon Jun 27, 2016 7:38 am Post subject: Re: Fulcrum type floor jack |
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The mechanical advantage on that puppy is more like 8-10:1, so you would only need about 80 pound force on that lever to lift a 1800 pound curb weight VW.
The eye at the top is to store it on its hook on the wall, of course.
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MrPolak
Samba Member
Joined: June 20, 2004
Posts: 1337
Location: AG ,atnaltA
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| Posted: Mon Jun 27, 2016 7:42 am Post subject: Re: Fulcrum type floor jack |
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| easy e wrote: |
| EverettB wrote: |
I'm no fulcrum expert but if you need 1000 lbs. of force and that long arm is 5' and the short one is 1' it looks like 200 lbs of force.
That seems a bit high for a normal user. |
Maybe not an expert, but you're correct.
In general the effort force can be expressed as
Fe = Fl (dl / de)
where
Fe = effort force (what we're solving for)
Fl = load force (say 1,000 lb)
dl = distance from load force to fulcrum (say 1 ft)
de = distance from effort force to fulcrum (say 5 ft) |
You need to use the ratio of distance of the lever pull to the distance the jack point moves. In this case the mechanical advantage is rather high since the car moves vertically only a small distance. |
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Clara
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Joined: June 14, 2003
Posts: 12399
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| Posted: Mon Jun 27, 2016 7:46 am Post subject: Re: Fulcrum type floor jack |
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| Abscate wrote: |
The mechanical advantage on that puppy is more like 8-10:1, so you would only need about 80 pound force on that lever to lift a 1800 pound curb weight VW.
The eye at the top is to store it on its hook on the wall, of course. |
And you are not lifting the entire bug, but just one side.
I think a square peg goes in the jack point, the peg pivots in the tool.
Useful tool for an emergency vehicle come to change a tire.
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Malokin Martin
Samba Member
Joined: August 19, 2007
Posts: 3099
Location: E-burg
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| Posted: Mon Jun 27, 2016 8:10 am Post subject: Re: Fulcrum type floor jack |
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| It really seems like it would need more of a nub (height) if it was meant to switch out a tire though... |
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Col_Forbin
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EverettB
Administrator
Joined: April 11, 2000
Posts: 69802
Location: Phoenix Metro
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| Posted: Mon Jun 27, 2016 9:38 am Post subject: Re: Fulcrum type floor jack |
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| Malokin Martin wrote: |
| It really seems like it would need more of a nub (height) if it was meant to switch out a tire though... |
I was thinking that too but maybe you are supposed to double pivot it until the long arm is on the ground and you stand on it to hold it in place.
I think it might be high enough at that point.
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busdaddy
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Joined: February 12, 2004
Posts: 51121
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Mon Jun 27, 2016 10:02 am Post subject: Re: Fulcrum type floor jack |
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Maybe it's not for tire changes, it could be for shifting the car sideways in tight garages, or getting out after some ass traps you in between other parked cars.
Looks like alot of other big prybars for moving frieght employed in the pre forklift days, but more specialized for a specific use.
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Who.Me?
Samba Member
Joined: July 14, 2014
Posts: 2204
Location: UK (South)
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| Posted: Mon Jun 27, 2016 11:55 am Post subject: Re: Fulcrum type floor jack |
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Not saying whether it's a jack or not, but for what it's worth, F1 teams employ quick lift lever-type jacks for tyre changes during races. Different shape, same premise...
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easy e
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Joined: May 28, 2008
Posts: 3931
Location: 1 hr north of Santa Barbara
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| Posted: Mon Jun 27, 2016 12:22 pm Post subject: Re: Fulcrum type floor jack |
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| MrPolak wrote: |
| You need to use the ratio of distance of the lever pull to the distance the jack point moves. In this case the mechanical advantage is rather high since the car moves vertically only a small distance. |
Is this better... (Beetle is 4'-11" high)
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