Kevin Mark Klughart

PhD, PE, JD, MIP, LLM

Patent Attorney / Engineer

 

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Fireplace

 

We have two wood burning fireplaces in the house and one constant problem is maintaining the fireplace log racks, as they tend to corrode over time.  After several welding repairs on the racks, I finally broke down and constructed several replacements using some stainless steel bar stock from the scrap yard.  The design was taken from a carbon steel fireplace log rack I saw at a house Jean and I visited for a church-wide prayer meeting.  The design incorporates two U-shaped members for the bottom legs and five U-shaped members to act as the wood basket.  A commercial implementation of this would use a bar bender to cold-form the bar stock but I ended up using an oxyacetelyne torch to heat and then bend the stock in a vise using a piece of pipe tube as leverage.

The dimensions on this grate were dictated by the 12-foot 3/4-inch SS bar stock I had on hand.  Legs are cut at 25 inches and 20 inches respectively with bends 2.5 inches from the ends for the legs, and the remaining stock is cut at 1x19.250, 2x20.375, 2x19.625, each with bends 5 inches from each end.  Distance from the back edge of the bar stock legs to the front edge of the bar stock legs was 10.625 inches, with an overall front-to back depth of 11 inches or so (the U-shaped bends were designed to not be exactly 90 degrees).  Since there are five basket U-brackets holding the wood, I had better luck welding the center U-bracket first, making sure everything was square.  Tack welds followed up by full-penetration welds were followed by placement of the other four U-brackets with equal spacing and then tack and full penetration welds for these items.  Welding was accomplished using 3/32-inch ER-316 SS rod and pure-helium TIG running a 5/32 pure tungsten  tip at about 250 ADC max.  I used helium because it was left over from filling balloons for a party - you might be surprised at the improved heat transfer of this gas over pure Argon! 

 

Contact Information:

Kevin Mark Klughart

Registered Patent Attorney, USPTO

3825 Leisure Lane, Denton, TX 76210-5589

tel: 800-353-1211 / 940-320-0580  -  fax 940-320-0581

Kevin@Klughart.com   email  -  web    www.Klughart.com

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