Armstrongs multi-positional handholds when incorporated into a manhole frame provides a secure handhold adding an extra measure of safety and convenience for a worker entering or exiting a manhole.  It is compliant with ASTM C478M in its upward position (ground level) and also in its downward position (below ground level).

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ARMSTRONGS multi-positional handholdS

Patent No:  US 9,845,586  -  US 10,030,350 -  US 10,030,351 - US 10,030,352 - CDN 2,915,957

AMPh OFFERS safety 

Armstrongs multi-positional handholds device allows for the extension of the step/rung distance.  ASTM C478M acknowledges the added safety feature of a handhold in a manhole frame by its provision for the distance from the rim of the manhole frame to the first step/rung in the manhole to be extended from 20" to 26" where a handhold is provided.

What amph provides 

The common practice of the addition of a step/rung into the concrete support structure of the frame, to comply with ASTM C478M and its requirement of a maximum of 20" will typically reduce the clearance in the area across from the step/rung from 25" to 19".  Ask any worker entering or exiting a manhole if he does not appreciate the added 6" of clearance in this area as afforded by the incorporation of Armstrongs multi-positional handholds into the manhole frame and the elimination of the step/rung in this area. 

Armstrongs multi-positional handholds device provides controlled entry and exit from a manhole.  "AMPH" positioned at ground level provides a secure hand hold for a worker to stabilize his entry into a manhole.  Choosing to use the handhold in its below ground level position, a worker need only to reach a few inches below ground level for the same secure handhold.  Upon exiting the manhole the moment he grasps the handhold his exit from the manhole will be controlled and comfortable.

Introduction