Scoping interest for fabrication of harness bars
02-05-2008, 01:50 AM
#30
sorry, this is the best I have right now. Its the LG bar. It has a 1/8 or maybe 1/4" plate the mounts to the rear seat belt area on each side then square tubing that exits the stock seatbelt holes(no cutting) angled at a slight tilt forward, then the tubing is welding to the face of that, it is even w/ where the front of the rear seat bottom would be. its got tabs on both sides to mount a Y or single mount 5 point to it. Then you just mount the other 2 to the seat bracket bolts behind the seat and fab up a quick submarine bracket for the front of the seat. that would be the best addition to the package..hint hint.
02-25-2008, 02:34 PM
#32
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guys...TTP has started making these so we elected not to futher pursue this at this point
https://ls1tech.com/forums/sponsor-group-purchases/864607-introductory-sale-ttp-harness-bar-kit-5-point-harnesses-till-2-29-a.html
https://ls1tech.com/forums/sponsor-group-purchases/864607-introductory-sale-ttp-harness-bar-kit-5-point-harnesses-till-2-29-a.html
12-11-2008, 12:08 AM
#36
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4th-gen harness bar discussion: I've already built these! You guys, the LG bar was copied off of the design that I and Chris Akers created and that we fabricated with John Groves of Groves Automotive in Roanoke, VA many years ago.
We sold one set to Jason McCall who then went to work for LG, and LG copied the original design but lightened it and that is most likely why people saw any flexing. Jason himself practically totalled a car using our original harness bar with no problems whatsoever, since our bar was built with mild-steel and the tubing was 1.75" which LG felt was overkill.
Here are pix of the original bar, which requires no cutting, welding, etc and is used in conjunction with a floor bar between the two front seat bolts (Wolfe now sells a floor bar as a separate item).
Maybe John Groves would be interested in cranking out another set as a bulk order, but he wasn't interested in single jobs. He has the jig setup to duplicate with accuracy.
Well, strangely enough it is not allowing uploads of my jpgs even though they are only 65KB apiece. Maybe I need more posts first.
Anyway, if a discussion is open lets talk. I enjoyed designing these in the fall of 1998 (yes 10 years ago), roadraced with it and had a great time until I installed a full 6-pt rollbar setup.
Randy Brown
We sold one set to Jason McCall who then went to work for LG, and LG copied the original design but lightened it and that is most likely why people saw any flexing. Jason himself practically totalled a car using our original harness bar with no problems whatsoever, since our bar was built with mild-steel and the tubing was 1.75" which LG felt was overkill.
Here are pix of the original bar, which requires no cutting, welding, etc and is used in conjunction with a floor bar between the two front seat bolts (Wolfe now sells a floor bar as a separate item).
Maybe John Groves would be interested in cranking out another set as a bulk order, but he wasn't interested in single jobs. He has the jig setup to duplicate with accuracy.
Well, strangely enough it is not allowing uploads of my jpgs even though they are only 65KB apiece. Maybe I need more posts first.
Anyway, if a discussion is open lets talk. I enjoyed designing these in the fall of 1998 (yes 10 years ago), roadraced with it and had a great time until I installed a full 6-pt rollbar setup.
Randy Brown
12-11-2008, 09:12 AM
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I have a harness mount which was produced by another company. It attaches to the upper rear seat belt mount and was very easy to install. However there are a few opportunities for improvement with their design:
1. It's too flexible. With such a long lever arm extending from the rear seatbelt mount, the harness bar does flex. I think if there was a method of adding two rods which connects to the lower rear seat belt mounts to triangulate it, that would probably be adequate. This rod wouldn't have to be too beefy because it would be in pure tension if you use "rod ends" to make the connection (i.e. no bending moment could be transferred thru the rod)
2. The harness mount tabs which are welded onto this harness bar are not at the appropriate angle which puts a bending load on the harness mounting tab. I corrected this by attaching my harness to the bar with the "wrap around" technique and then the tabs keeps the harness from "walking" out of position. I'd encourage you to design your harness bar for the "warp around" technique with some "end stops"
The camara mount issue is really easily addressed by using an I/O port camera mount and an "2.5-3 inch spacer" to raise up the mount. I wouldn't bother incorporating this into the design of the harness bar, it will just add a ton of cost.
1. It's too flexible. With such a long lever arm extending from the rear seatbelt mount, the harness bar does flex. I think if there was a method of adding two rods which connects to the lower rear seat belt mounts to triangulate it, that would probably be adequate. This rod wouldn't have to be too beefy because it would be in pure tension if you use "rod ends" to make the connection (i.e. no bending moment could be transferred thru the rod)
2. The harness mount tabs which are welded onto this harness bar are not at the appropriate angle which puts a bending load on the harness mounting tab. I corrected this by attaching my harness to the bar with the "wrap around" technique and then the tabs keeps the harness from "walking" out of position. I'd encourage you to design your harness bar for the "warp around" technique with some "end stops"
The camara mount issue is really easily addressed by using an I/O port camera mount and an "2.5-3 inch spacer" to raise up the mount. I wouldn't bother incorporating this into the design of the harness bar, it will just add a ton of cost.
12-11-2008, 04:21 PM
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1. It's too flexible. With such a long lever arm extending from the rear seatbelt mount, the harness bar does flex. I think if there was a method of adding two rods which connects to the lower rear seat belt mounts to triangulate it, that would probably be adequate. This rod wouldn't have to be too beefy because it would be in pure tension if you use "rod ends" to make the connection (i.e. no bending moment could be transferred thru the rod)
these are the only pics i have of it so far. maybe this weekend ill get some more. ignore the eye candy, if you can.....
12-11-2008, 06:20 PM
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Your right, the bar looks completely wrong for her seating position. 
Seriously though, could you post some better pictures of the bar. Maybe from the back of the car with the hatch up.
Seriously though, could you post some better pictures of the bar. Maybe from the back of the car with the hatch up.