The Special Machines group designs unique solutions, serving numerous industries with a focus on the HVAC and Appliance industries.

Ehrhardt holds several U.S. Patents pertaining to the design and manufacture of residential furnace heat exchangers and blower housings. Other work includes patents assigned to customers.

Patent No: 5,119,706 Issue Date: June 9, 1992
Machine process for chamfering of precision pieces having non-linear edges device therefore

Patent No: 10/666,391 Issue Date: September 19, 2003
Method and apparatus for fabricating helically shaped ribbons of material

Patent No: 5,221,183 Issue Date: June 22, 1993 Blower housing seam and method of making same

Patent No: 5,195,580 Issue Date: March 23, 1993 Heat exchanger seam and method of making same

Patent No: 5,575,330 Issue Date: November 19, 1996 Furnace heat exchanger seal and method of making same

Patent No: 5,253,502 Issue Date: October 19, 1993 Apparatus and method for bending and forming sheet material

^ Click here to enlarge image	«Fully automated residential furnace wrapper line This Line will run four (4) different parts in both painted and galvanized materials. Stations are: 1.) De-stacker (not shown), 2.) Punch Cell, 3.) Side Bend, 4.) End Bend and 5.) U-Bend. Line capable of running additional parts with minimal changeover.
Louver cabinet wrapper line » A Louvering/Edge Forming/End Forming and U-Forming process line for outdoor condensing unit enclosures.	^ Click here to enlarge image
^ Click here to enlarge image	« U-form station This is the station in the louver cabinet wrapping line that U-bends the 3-sided enclosures for outdoor condensing units.
PLC controlled process line » Shown here is a computer-controlled process line to punch, cut off, roll form and finish form furnace blower wrappers. This single line can produce wrappers in five different widths and two different lengths with various hole configurations and features.	^ Click here to enlarge image
^ Click here to enlarge image	« Automated lines Ehrhardt has experience producing turn-key systems. Shown at left is an Ehrhardt-produced automated line that assembles and leak-tests furnace heat exchangers.
Assembly machine » Shown here is a two-position assembly machine for crimp-closing range flue boxes. The flue box component parts were produced on tooling designed and built by Ehrhardt.	^ Click here to enlarge image