Working on a creating a portable RV Jac.
Came up with a simple screw jack setup. Now working on getting it manufactured by a local fabrication shop.
Gone through several design changes, have a final edition that isn’t shown, it is over at the metal fab shop for a price quote. As you can see from the photos, I’m not the best welder….
The one that will be built will be close to the following prototype specs:
Weight: 1lb 0.1 oz
Height Before Extension: 4.5”
Height Extended: 7.25”
Base: 3” x 4” x 1/8” Mild Steel Plate
Tower: 1” square mild steel tube
Screw lift: ˝” All Thread
Normally would need a 7/8” wrench to work the nut, now using a square tube and some pins, trying to go tool-less as you can see in some of the photos. Clearing a flat tire/disc brake became a challenge with a couple of the designs.
Photos show some of the prototypes, there are more.
Photo of the best working ones, the one on the right had great promise, until it started leaning while it was being extended; lightest one of the group at 14.2oz, the handles at the bottom hit the tire when full or flat had to use the hose clamp again, it did raise the RV using just the handles to rotate:
This photo shows sliding under the axle. Problem with this jack was it could not be placed under the axle like designed for. Had to slide and lock it under the hose clamp further out. The tabs hit the disc brake…. It did miss the flat tire when it is under the axle, just couldn’t rotate the nut to extend it.
This photo shows the lift available to get the tire off the ground when full. Notice had to lift on the hose clamp due to the disc brake issue.
Another angle while extended.
A different prototype at work. This one cost quite a bit of money for the parts. Over 3lbs but can lift over 7”. Main/bottom thread and nut are from a pipe jack stand.
Trying to get the RV Jac under the axle on pavement and having enough lift was a challenge. In dirt it will be a non-issue, just use the base to scrape a pad.