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Wood grab bars ?

10/6/14       
Tom G

Does anyone know of a source for wood grab bars ? I need something similar to a handicap type metal grab bar but in wood . Have tried searching on the net but with no luck .

Thanks

Tom

10/6/14       #2: Wood grab bars ? ...
Josh Koschak Member

What geometry are you referring to?

10/6/14       #3: Wood grab bars ? ...
Tom G

Just something round that's on a stand off or with the ends returned into the wall like a typical handicap grab bar .Customer just doesn't want it to be metal .

10/6/14       #4: Wood grab bars ? ...
Josh Koschak Member

Can you look in to standard hand-rail profiles?

10/6/14       #5: Wood grab bars ? ...
scott

A couple steel end pieces with heavy dowel between should suffice. You won't be approved by whatever safety council approves such things of course & no NSF label.

I found this too & it has something similar- google - wood safety grab bars - images

wood grab bar

10/6/14       #6: Wood grab bars ? ...
Joe Terzano  Member

Website: Terzanocabinetry.com

Made our own as customer wanted square cross section 1 1/2 x 1 1/2. Made wood standoffs used toggle bolts to fasten and capped with wood plugs in case it ever loosened. Very secure.

10/6/14       #7: Wood grab bars ? ...
Alan F.

Grab bars need to support 250 lbs. of force, in public places. Probably a good idea, if someone ever really needs it and puts all their weight on it the connection to the bar or the wall need to be more than a wood screws like a handrail bracket uses.

I wood probably make it out of two halves of a single shape of wood machined on a CNC then embed a rod with a "L" shape and epoxy the two pieces together. Then figure out a method of attachment that will resist all the force.

ADA-style grab bars and their mounting devices should withstand more than 250 pounds (1112 N) of force.

1) Bending stress in a grab bar or seat induced by the maximum bending moment from the application of 250 lbf (1112N) shall be less than the allowable stress for the material of the grab bar or seat.

38(2) Shear stress induced in a grab bar or seat by the application of 250 lbf (1112N) shall be less than the allowable shear stress for the material of the grab bar or seat. If the connection between the grab bar or seat and its mounting bracket or other support is considered to be fully restrained, then direct and torsional shear stresses shall be totaled for the combined shear stress, which shall not exceed the allowable shear stress.

(3) Shear force induced in a fastener or mounting device from the application of 250 lbf (1112N) shall be less than the allowable lateral load of either the fastener or mounting device or the supporting structure, whichever is the smaller allowable load.

(4) Tensile force induced in a fastener by a direct tension force of 250 lbf (1112N) plus the maximum moment from the application of 250 lbf (1112N) shall be less than the allowable withdrawal load between the fastener and the supporting structure.

(5) Grab bars shall not rotate within their fittings.

10/7/14       #8: Wood grab bars ? ...
mark

Hmmm. Alan, I think that your specs are wrongly focused. What good does it do to tell the forces what they can't exceed?
Tom, Have you looked at grabrails for sailboats: they're commonly wooden. For example:

rail

10/8/14       #9: Wood grab bars ? ...
Alan F.

Mark,
the issue isn't the wood, the issue is the connection detail, those teak rails look like a single piece. If you use a small #10 like some handrail brackets it doesn't matter how strong the rail is the connector will fail.

The specs state that the connector's rated load must be more than the combined loads applied, i.e. if a 250 load is applied the fastener must have a 260 lb. rating so the load applied to the fastener is less than the load the fastener is rated for.

A-

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