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Bulletproof Bumpers

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john jacott

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Aug 7, 1999, 3:00:00 AM8/7/99
to
What does B-proof use for a pivot on their tire carrier? Does anyone know
where to get one? I broke mine.

----------------------------------------------------------------------------
-----------
John Jacott
Life is not a journey to the grave with the intention
of arriving safely in one pretty and well preserved piece,
but to skid broadside, thoroughly used up, worn out,
defiantly shouting "GERONIMO".

Information can be found at:
http://people.ne.mediaone.net/jjacott/index.htm

Raymund Woo

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Aug 7, 1999, 3:00:00 AM8/7/99
to
Are you implying that you already have a BProof bumper? If so just call up
BProof and they'll send you another bumper for free.

Ray

john jacott wrote in message ...

john jacott

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Aug 7, 1999, 3:00:00 AM8/7/99
to
No. I built a bumper of my own. The bumper is solid, I just can't find a
pivot that is sturdy enough to handle 200+ pounds on my swingout.

----------------------------------------------------------------------------


-----------
John Jacott
Life is not a journey to the grave with the intention
of arriving safely in one pretty and well preserved piece,
but to skid broadside, thoroughly used up, worn out,
defiantly shouting "GERONIMO".

Raymund Woo <ray...@mindspring.com> wrote in message
news:7ohpsb$r4o$1...@nntp5.atl.mindspring.net...

DougB

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Aug 7, 1999, 3:00:00 AM8/7/99
to
Bullet proof should provide one free. "You break it...we buy it" is their
motto.

Inger

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Aug 7, 1999, 3:00:00 AM8/7/99
to
a little off topic but......

Has anyone ever broken anything on a BP Bumper?? Just curious...

Greg


john jacott <jja...@DOORS.mediaone.net> wrote in message
news:iHZq3.723$5E3....@ndnws01.ne.mediaone.net...


> What does B-proof use for a pivot on their tire carrier? Does anyone know
> where to get one? I broke mine.
>

> --------------------------------------------------------------------------
--
> -----------
> John Jacott

Special...@webtv.net

unread,
Aug 7, 1999, 3:00:00 AM8/7/99
to
Just like you I made my bumper. I didn't go with the swing out option,
'cause I was moving and ran out of fabrication time. I did some rough
calculations and figured that a 1 inch diameter grade 8 bolt would be
"bullet proof". I was also planning to use sintered bronze bushings for
the hinge. I had purchased those items. The bushings were 1 inch
inside diameter, shouldered, and had an outside diameter of 1.25 inches.
The bushings slid over the bolt perfectly. You should have no problems
if you use my idea. Also I got a matching sloted nut and cotter pin to
hold the whole thingy together.

Have fun making it happen.

P.S. Those over center toggle clamps are made by a couple of places.
De-Sta-Co is one mfgr, the other is Carr-Lane. The rated loads should
be about 2500lbs for the toggle clamps. Look on the internet for
"Tooling Components" . Those clamps are used regularly in the tool
design world.

Special_K


john jacott

unread,
Aug 7, 1999, 3:00:00 AM8/7/99
to
I used a similar approach. A grade 5- 7/8" bolt, with a bracket from the
bumper going over the tire carrier. I have bushing on top and below the
carrier. The bolt goes through the bracket, bushing, tire carrier, bushing
and finally the bumper.
Swing out the tire carrier and it drops below the bumper level. I am not
happy with it. You have to lift it, in order to latch it.
I need a pivot point capable of dealing with 250+ pounds.

--
----------------------------------------------------------------------------


-----------
John Jacott
Life is not a journey to the grave with the intention
of arriving safely in one pretty and well preserved piece,
but to skid broadside, thoroughly used up, worn out,
defiantly shouting "GERONIMO".

<Special...@webtv.net> wrote in message
news:16503-37...@newsd-212.iap.bryant.webtv.net...

john jacott

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Aug 7, 1999, 3:00:00 AM8/7/99
to
250 pounds is the weight of the tire, carrier, cans and high lift jack.
Roughly.
The bolt holes have a grade 8 3/4" washers welded to it with 7018 rod. The
bolt it self is grade 5 (better shear resist). I just don't like the drop.
The brace on top of the carrier is welded to the bumper and is a half inch
thick.
My math tells me that the hard parts will handle roughly 2500lbs. It's the
damn bushings I am trying to work out. Does anyone know where I can get two
half inch thick bronze bushings with 3/4 inch holes in them? I need
something more than the poly that I have in there now. It allows too much
deflection
I was thinking of a pillow bearing, but I can't find one large enough.
Should I take some pictures, as soon as I get my camera back?


--
----------------------------------------------------------------------------
-----------
John Jacott
Life is not a journey to the grave with the intention
of arriving safely in one pretty and well preserved piece,
but to skid broadside, thoroughly used up, worn out,
defiantly shouting "GERONIMO".

DougW <lx...@mmcable.com> wrote in message
news:Cy4r3.735$y5.2...@typhoon2.kc.rr.com...
> Your pivot point will probably have to
> deal with a lot more than 250 pounds.
>
> You have to consider torque forces when your
> constructing a pivot point or brace.
> Weight X Distance will give you torque at the
> pivot. Then you figure out the length and cross
> section required to support that shear load.
>
> (I'm delving into statics and strengths so bear with me
> as I just succeeded in loosing myself.)
>
> To make a pivot that will hold a significant amount of
> shear, you will need to adopt a sleeve/pin type of setup.
> Just using holes in metal will not be strong enough.
> And the fittings have to be precise as just a few 1/100
> of slop will magnify the further you get away from the pivot.
>
> You also have to consider the weight of the tire and how
> much the metal support will deflect under that load. The
> final pivot point may not be at 90 degrees to the brace.
> It may be at 3-5 degrees off so when the tire is put on
> the brace levels out.
>
> (ya know this is easier to explain on paper) :/
>
> FWIW: I do these type of calculations for mounting
> microwave dishes and antennas to towers.
>
> --
> -- LXIX -- 93 ZJ 4.0 http://home.mmcable.com/douglasw
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust


>
>
> john jacott <jja...@DOORS.mediaone.net> wrote in message

> news:v64r3.772$5E3....@ndnws01.ne.mediaone.net...


> > I used a similar approach. A grade 5- 7/8" bolt, with a bracket from the
> > bumper going over the tire carrier. I have bushing on top and below the
> > carrier. The bolt goes through the bracket, bushing, tire carrier,
bushing
> > and finally the bumper.
> > Swing out the tire carrier and it drops below the bumper level. I am not
> > happy with it. You have to lift it, in order to latch it.

> > I need a pivot point capable of dealing with 250 pounds.
> >
> >
> >
> > --
>
> --------------------------------------------------------------------------

john jacott

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Aug 7, 1999, 3:00:00 AM8/7/99
to

OSM TJ

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Aug 7, 1999, 3:00:00 AM8/7/99
to
Here I thought all of us BP owners would have a chance to gloat about our
fine bumpers again. Oh well, maybe next time ;)

--
Scott Kruize
Phoenix, AZ
OS...@psn.net


john jacott <jja...@DOORS.mediaone.net> wrote in message

news:iHZq3.723$5E3....@ndnws01.ne.mediaone.net...
> What does B-proof use for a pivot on their tire carrier? Does anyone know
> where to get one? I broke mine.
>

DougW

unread,
Aug 8, 1999, 3:00:00 AM8/8/99
to

john jacott <jja...@DOORS.mediaone.net> wrote in message

news:v64r3.772$5E3....@ndnws01.ne.mediaone.net...
> I used a similar approach. A grade 5- 7/8" bolt, with a bracket from the
> bumper going over the tire carrier. I have bushing on top and below the
> carrier. The bolt goes through the bracket, bushing, tire carrier, bushing
> and finally the bumper.
> Swing out the tire carrier and it drops below the bumper level. I am not
> happy with it. You have to lift it, in order to latch it.
> I need a pivot point capable of dealing with 250 pounds.
>
>
>
> --
> ----------------------------------------------------------------------------

> -----------
> John Jacott
> Life is not a journey to the grave with the intention
> of arriving safely in one pretty and well preserved piece,
> but to skid broadside, thoroughly used up, worn out,
> defiantly shouting "GERONIMO".
>
> Information can be found at:
> http://people.ne.mediaone.net/jjacott/index.htm

DougW

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Aug 8, 1999, 3:00:00 AM8/8/99
to
Pictures would definitely help. But it sounds like you already
did most of the math.

As for the bushings, try a tractor repair shop.
They should have some big bushings.

If that fails try a machine shop that deals with heavy
industry. They should know where to get them.

The ones I use at work come from the Fed stock system so I'm not
sure who makes them.. I can look on Monday and see if they
list a manufacturer.

--
-- LXIX -- 93 ZJ 4.0 http://home.mmcable.com/douglasw
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust

john jacott <jja...@DOORS.mediaone.net> wrote in message

news:O65r3.783$5E3....@ndnws01.ne.mediaone.net...


>
> 250 pounds is the weight of the tire, carrier, cans and high lift jack.
> Roughly.
> The bolt holes have a grade 8 3/4" washers welded to it with 7018 rod. The
> bolt it self is grade 5 (better shear resist). I just don't like the drop.
> The brace on top of the carrier is welded to the bumper and is a half inch
> thick.
> My math tells me that the hard parts will handle roughly 2500lbs. It's the
> damn bushings I am trying to work out. Does anyone know where I can get two
> half inch thick bronze bushings with 3/4 inch holes in them? I need
> something more than the poly that I have in there now. It allows too much
> deflection
> I was thinking of a pillow bearing, but I can't find one large enough.
> Should I take some pictures, as soon as I get my camera back?
>

> --
> ----------------------------------------------------------------------------
> -----------
> John Jacott
> Life is not a journey to the grave with the intention
> of arriving safely in one pretty and well preserved piece,
> but to skid broadside, thoroughly used up, worn out,
> defiantly shouting "GERONIMO".
>
> Information can be found at:
> http://people.ne.mediaone.net/jjacott/index.htm

> DougW <lx...@mmcable.com> wrote in message
> news:Cy4r3.735$y5.2...@typhoon2.kc.rr.com...

john jacott

unread,
Aug 8, 1999, 3:00:00 AM8/8/99
to
Thanks Doug,
I would appreciate that. Once I get this portion of it worked out, I'll put
the plans out on the web. So far my bumper and tire carrier is 85.00.

My design uses a spare hub, stub shaft, bearings and anything else to repair
knuckles out on my CJ. It also allows the tire to spin or be locked down.
I am rather proud of it.
To prove how sturdy it was, I opened up the tire carrier and lifted my jeep
with it!
I just don't like the way I have to lift up a bit to close it!
Once again, Thanks.


----------------------------------------------------------------------------
-----------
John Jacott
Life is not a journey to the grave with the intention
of arriving safely in one pretty and well preserved piece,
but to skid broadside, thoroughly used up, worn out,
defiantly shouting "GERONIMO".

Information can be found at:
http://people.ne.mediaone.net/jjacott/index.htm
DougW <lx...@mmcable.com> wrote in message

news:vu7r3.1004$b5.2...@typhoon2.kc.rr.com...

john jacott

unread,
Aug 8, 1999, 3:00:00 AM8/8/99
to
250 pounds is the weight of the tire, carrier, cans and high lift jack.
Roughly.
The bolt holes have a grade 8 3/4" washers welded to it with 7018 rod. The
bolt it self is grade 5 (better shear resist). I just don't like the drop.
The brace on top of the carrier is welded to the bumper and is a half inch
thick.
My math tells me that the hard parts will handle roughly 2500lbs. It's the
damn bushings I am trying to work out. Does anyone know where I can get two
half inch thick bronze bushings with 3/4 inch holes in them? I need
something more than the poly that I have in there now. It allows too much
deflection
I was thinking of a pillow bearing, but I can't find one large enough.
Should I take some pictures, as soon as I get my camera back?
----------------------------------------------------------------------------
-----------
John Jacott
Life is not a journey to the grave with the intention
of arriving safely in one pretty and well preserved piece,
but to skid broadside, thoroughly used up, worn out,
defiantly shouting "GERONIMO".


--


----------------------------------------------------------------------------
-----------
John Jacott
Life is not a journey to the grave with the intention
of arriving safely in one pretty and well preserved piece,
but to skid broadside, thoroughly used up, worn out,
defiantly shouting "GERONIMO".

Information can be found at:
http://people.ne.mediaone.net/jjacott/index.htm
DougW <lx...@mmcable.com> wrote in message

DougW

unread,
Aug 8, 1999, 3:00:00 AM8/8/99
to
Just had a beer inspired idea!

Can you fab a little ramp like thing that kicks it up
as you close it? It would be a wear point but should last.

--
-- LXIX -- 93 ZJ 4.0 http://home.mmcable.com/douglasw
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust

john jacott <jja...@DOORS.mediaone.net> wrote in message

news:%G7r3.821$5E3....@ndnws01.ne.mediaone.net...

MEKSTR1

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Aug 8, 1999, 3:00:00 AM8/8/99
to
I got an axle hub assembly from a trailer store (2000lb). A friend machined
the hub to a nice round surface and will provide a great pivot for the tire
carrier. It cost me $40.

>"john jacott" Wrote
jja...@DOORS.mediaone.net
>Date: Sat, 07 August 1999 01:47 PM EDT

>No. I built a bumper of my own. The bumper is solid, I just can't find a
>pivot that is sturdy enough to handle 200+ pounds on my swingout.
>


Robert
1995 YJ Sport, Old Man Emu Lift, MORE Shackle Reversal, Buggy Spring and 1"
Body Lift, 4.56, Front ARB, Rear Gearless, 33"MT's, JB Kit, Tom Woods CV Shaft,
ProPlus 8000, Conferr bumpers, Tomken Rock Skidz, RE hand throttle, JKS
disconnects

john jacott

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Aug 8, 1999, 3:00:00 AM8/8/99
to
Yes, I am. Where can one obtain a Nylatron bushing?

Aron O'Proinntigh

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Aug 9, 1999, 3:00:00 AM8/9/99
to
In article <iHZq3.723$5E3....@ndnws01.ne.mediaone.net>,
"john jacott" <jja...@DOORS.mediaone.net> wrote:

>What does B-proof use for a pivot on their tire carrier? Does anyone know
>where to get one? I broke mine.
>

>----------------------------------------------------------------------------
>-----------
>John Jacott
>Life is not a journey to the grave with the intention
>of arriving safely in one pretty and well preserved piece,
>but to skid broadside, thoroughly used up, worn out,
>defiantly shouting "GERONIMO".
>
>Information can be found at:
>http://people.ne.mediaone.net/jjacott/index.htm
>
>

Are you talking about the Nylatron bushing?

Aron

Aron O'Proinntigh

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Aug 9, 1999, 3:00:00 AM8/9/99
to
In article <eyrr3.1585$5E3....@ndnws01.ne.mediaone.net>,
"john jacott" <jja...@DOORS.mediaone.net> wrote:

>Yes, I am. Where can one obtain a Nylatron bushing?
>
>
>
>

I guess I'd call Bulletproof and find out where they get their Nylatron. I'm pretty sure they manufacture the bushing from
Nylatron "stock." It comes in lengths and they put it on a lathe (VERY tight tolerances), drill a hole down the center for
the metal bolt, then pound it into the opening in the bumper. I'm probably not describing it that well, but I've seen it, and
it does look like a tough product.

Aron

yucca-man

unread,
Aug 9, 1999, 3:00:00 AM8/9/99
to
Nylatron. Hmm.. Sounds like something you'd find in a 60s Sci-Fi show:
"Captain, the Nylatron wobulator is disintegrating, we canna go any
faster..."

Jim Yucc...@juno.com
Charter Member - Arizona Virtual Jeep Club
http://members.tripod.com/~Yucca_man/azjeep
73 CJ5 (RIP) 89 Cherokee 99 Dodge Ram QCab

john jacott wrote in message ...

DougB

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Aug 10, 1999, 3:00:00 AM8/10/99
to
LOL....Nylatron comes from the Krell!

yucca-man wrote in message <7oojop$be3$1...@news.inficad.com>...

Richard J Pierson

unread,
Aug 11, 1999, 3:00:00 AM8/11/99
to DougW
DougW wrote:
>
> Just had a beer inspired idea!
>
> Can you fab a little ramp like thing that kicks it up
> as you close it? It would be a wear point but should last.

Those you can get a sears, they use them on refigerator doors so they
are self closing.
You pull it out and the door goes up a hair on for lack of a better term
a "ramp washer", let the door go and it slides down off the ramp washer
and closes. The ones on the refigerator/freezer door are teflon so I don't
know their strength or if they come in varous diameters.


--
***********************************
Rich Pierson
fi...@ptd.net
***********************************

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