Backcountry Forum

Make Your Own Gear

Amazon.com
Backpacking Forums
BackcountryGear.com
backcountry gear

---- Our Gear Store ----
The Lightweight Gear Store
 
 ULTRA-LIGHT 

Ultralight Backpacks
Ultralight Bivy Sacks
Ultralight Shelters
Ultralight Tarps
Ultralight Tents
Ultralight Raingear
Ultralight Stoves & Cookware
Ultralight Down Sleeping Bags
Ultralight Synthetic Sleep Bags
Ultralight Apparel


the Titanium Page
WM Extremelite Sleeping Bags

 CAMPING & HIKING 

Backpacks
Tents
Sleeping Bags
Hydration
Kitchen
Accessories

 CLIMBING 

Ropes & Cordage
Protection & Hardware
Carabiners & Quickdraws
Climbing Packs & Bags
Big Wall
Rescue & Industrial

 MEN'S APPAREL 

Jackets
Shirts
Baselayer
Headwear
Gloves
Accessories

 WOMEN'S APPAREL 

Jackets
Shirts
Baselayer
Headwear
Gloves
Accessories

 FOOTWEAR 

Men's Footwear
Women's Footwear

 CLEARANCE 

Backpacks
Mens Apparel
Womens Apparel
Climbing
Footwear
Accessories

 BRANDS 

Black Diamond
Granite Gear
La Sportiva
Osprey
Smartwool

 WAYS TO SHOP 

Sale
Clearance
Top Brands
All Brands

 Backpacking Equipment 

Shelters
BackPacks
Sleeping Bags
Water Treatment
Kitchen
Hydration
Climbing


 Backcountry Gear Clearance


 WINTER CAMPING 

Shelters
Bivy Bags
Sleeping Bags
Sleeping Pads
Snow Sports
Winter Kitchen

 SNOWSPORTS 

Snowshoes
Avalanche Gear
Skins
Hats, Gloves, & Gaiters
Accessories

Stay Healthy--Eat Well

MARY JANES FARM ORGANIC MEALS

Mary Janes Farm Organic Backcountry Meals

NATURAL HIGH GOURMET MEALS

Natural High

 

Topic Options
Rate This Topic
#136021 - 07/10/10 11:55 AM Load Balancing Pack Frame
DJ2 Offline
member

Registered: 01/06/02
Posts: 1347
Loc: Seattle, WA
I was fooling around with a load balancing pack frame idea on a backpack trip this week. A little googling showed that I was just reinventing the wheel. Check out this patent.

http://www.patentgenius.com/patent/4217998.html

Enlarge the first drawing, by couble clicking it, to get a good idea of how it might look.

Top
#136936 - 07/29/10 04:05 PM Re: Load Balancing Pack Frame [Re: DJ2]
Spock Offline
member

Registered: 01/10/06
Posts: 679
Loc: Central Texas
Dj2,
These things have been around for at least 40 years. Simple mechanical analysis and experience show that they work no better than standard frames. They cannot actually shift the center of mass. The result is complexification and weight with no improvement in performance.

Top
#136944 - 07/29/10 04:20 PM Re: Load Balancing Pack Frame [Re: Spock]
DJ2 Offline
member

Registered: 01/06/02
Posts: 1347
Loc: Seattle, WA
I recall that Jan Sport and others used to have a contraption attached to the waist belt shaped like a U on its side. Do you think that was their attempt to replicate this idea?

Top
#136962 - 07/29/10 08:16 PM Re: Load Balancing Pack Frame [Re: DJ2]
Spock Offline
member

Registered: 01/10/06
Posts: 679
Loc: Central Texas
This basic idea has been made/reinvented in two forms: passive wrap-around frames like the Jansport you mention as well as the Coleman plastic frame; and active leveraging devices like the 'weight balancing' frame. To my knowledge, no one has mass produced any of active leveraging devices. They look good on paper if you don't look too closely, but the prototypes have failed to meet expectations. Notice the date on the patent application. The idea wasn't new then. It's just that it didn't work, so no one followed up. Wrap-around frames don't work that well either. The theory is that they place the pack weight over the hips, closer to the user's center of mass. Of course, that ignores the basic mechanics of leverage. All it really dies is enable the pack to sit up on its own. In the Coleman design it gives the plastic frame extra structural support that it needs.

Top
#136973 - 07/29/10 10:45 PM Re: Load Balancing Pack Frame [Re: Spock]
DJ2 Offline
member

Registered: 01/06/02
Posts: 1347
Loc: Seattle, WA
Thanks for the helpful info.

Top

Shout Box

Highest Quality Lightweight Down Sleeping Bags
 
Western Mountaineering Sleeping Bags
 
Lite Gear Talk - Featured Topics
Bivvy Sack combo Arrangement
by Jim M
10/18/17 01:58 AM
what is the lightest framed backpack around 40L
by toddfw2003
10/16/17 07:23 PM
a worthy challenger to the msr pocket rocket2
by the-gr8t-waldo
10/16/17 01:28 PM
Backcountry Discussion - Featured Topics
Napa Fires
by balzaccom
10/11/17 07:43 PM
Backpacking the Ouachita Trail thanksgiving
by toddfw2003
10/05/17 11:54 PM
Rockfalll on El Capitan in Yosemite
by balzaccom
09/28/17 09:47 AM
Make Your Own Gear - Featured Topics
alcohol stove comparisons
by Bike_packer
10/03/17 08:56 PM
Can footprint plasticizer harm tent ground-sheet?
by Weston1000
09/10/17 02:24 AM
Featured Photos
Breakneck Ridge, New York
May 2012 Eclipse, Lassen Park
New Years Eve 2011
Trip Report with Photos
Seven Devils, Idaho
Oat Hill Mine Trail 2012
Dark Canyon - Utah
Who's Online
1 registered (), 30 Guests and 0 Spiders online.
Key: Admin, Global Mod, Mod
Newest Members
Blackbuzzard, LivelyLiz, Weve, Tones21, Pasquale
12424 Registered Users
Forum Links
Disclaimer
Policies
Site Links
HOME
Backpacking.net
Family Hiking
Lightweight Gear Store
Backpacking Book Store
Lightweight Zone
Hiking Essentials

Outdoor Gear Daily Deals
Outlets, Sales, Bargains

Our long-time Sponsor, BackcountryGear.com - The leading source for ultralite/lightweight outdoor gear:

Backcountry Forum
 
 

Since 1996 - the Original Backcountry Forum
Copyright © The Lightweight Backpacker & BackcountryForum.com