Knobs and Handles for Lids

There are two basic ways that a knob or handle can be attached to a cover or lid (unless of course the handle is molded into the lid; as in some cast iron and glass covers). For metal covers, the knob or handle can be spotwelded into place using high direct current (typically done with what is known as a strap handle, see illustration) or fixed mechanically with a rivet or a screw. For glass covers, the knobs are typically mechanically fixed with a screw or bolt.

If a knob is attached using a screw, the CMA recommends that the screw threads engage the knob a minimum of three full turns. Additionally, the CMA also recommends telling the consumer how to tighten the screw(s) should the knob or handle become loose.

The CMA also recommends particularly that knobs attached to glass covers have gasket material installed between the knob and the surface of the glass to guard against scratching of the glass or placing the glass under undue tension, which might allow sudden shattering of the part.

Knobs designed to release steam should be designed and installed in such a manner than turning the knob "closed" can be accomplished without undue force being used.
 
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Lids

Knobs and Handles for Lids

Simple Strap-type Metal or Plastic HandleThere are two basic ways that a knob or handle can be attached to a cover or lid (unless of course the handle is molded into the lid; as in some cast iron and glass covers). For metal covers, the knob or handle can be spotwelded into place using high direct current (typically done with what is known as a strap handle, see illustration) or fixed mechanically with a rivet or a screw. For glass covers, the knobs are typically mechanically fixed with a screw or bolt.

If a knob is attached using a screw, the CMA recommends that the screw threads engage the knob a minimum of three full turns. Additionally, the CMA also recommends telling the consumer how to tighten the screw(s) should the knob or handle become loose.

The CMA also recommends particularly that knobs attached to glass covers have gasket material installed between the knob and the surface of the glass to guard against scratching of the glass or placing the glass under undue tension, which might allow sudden shattering of the part.

Knobs designed to release steam should be designed and installed in such a manner than turning the knob "closed" can be accomplished without undue force being used.


 

 

 
 
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