Means for adjusting the zero point setting of a meter

Claim 1

Torsion adjusting means for the indicating element of an electrical instrument comprising: an instrument having an instrument casing and having an instrument mechanism within the casing, said instrument casing having a bobbin with an electrical conductor wound thereon and having torsion elements exerting a torsional force on the bobbin and an indicator extending from the bobbin; a rotatable element extending through the instrument casing with a portion thereof accessible from the casing exterior and an internal portion thereof disposed within the casing; said rotatable element being rotatable at an external portion thereof by imparting a rotary force to said external portion; the internal portion of said rotary element being adapted to impart lateral side to side movement within said casing as the external portion of said rotary element is rotated; an intermediate element within said housing mechanically coupled to the internal portion of said rotary element; said intermediate element being adapted to undergo a lateral movement responsive to force imparted by the internal portion of said rotary element; an internal elongated pivot element mounted at one end thereof to said instrument mechanism and being adapted to pivot relative to said mechanism to impart a pivot motion to a bobbin mounting means of said instrument and said internal elongated element being coupled at the extended end thereof into operative engagement with the intermediate element of said adjusting means.