Hapco Receives Handhole Patent

Most poles require handhole openings for wiring access, and in some cases the appearance and strength of the pole are compromised for this necessity. However, the engineering team at Hapco has developed a product so that the strength of the pole can be maintained and the visibility of the handhole is minimized. This remarkable product is Hapco's reinforced flush handhole (U.S. Patent No. 7,157,642), and it also improves the fatigue life of the handhole. With this design the opening is elliptical in shape with clear opening dimensions of 4 inches along the minor axis and 6 inches along the major axis, and is reinforced with a cast aluminum frame of 356-T6 alloy. The reinforcing frame fits on the inside diameter of the shaft at the handhole with flange protruding through the handhole opening to provide a V-groove for the frame to shaft weld. More material is provided in the reinforcing frame as more material is removed from the pole shaft for the handhole opening. The weld is fully backed and ground smooth to provide for a weld consistent with Detail 9 of Table 11-2 of the AASHTO "Standard Specifications for Structural Supports for Highway Signs, Luminaire and Traffic Signals" 4th Edition, 2001. Lugs are provided to attach an aluminum handhole cover of 6063-T6 alloy. The new Hapco reinforced flush handhole combines the attributes of being one of the best looking, most fatigue resistant and strongest handholes in the industry. For more information or to get a quote on your project call 800.368.7171.


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