US 3,973,265 AGranted

Temperature recording instrument

AssigneeH. O. Trerice Co.

InventorRichard A. Andrews

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Abstract

The temperature Recording instrument contains the usual thermal measuring system consisting of a bellows assembly, a temperature sensitive bulb and capillary tubing between the bellows and bulb and a recording system including a marking element which is responsive to the energization of the bellows for permanently indicating the temperature sensed by the bulb on chart paper mounted on a base plate located in the instrument housing. A fulcrum having an axis extends through the base plate and carries a bracket which is provided with one slot or with a pair of slots on opposite sides of the axis. A spool is located in one or the other of the slots. An adjusting screw is carried by the bracket and is threadedly connected to the spool. Rotation of the adjusting screw is effective to move the spool in the corresponding slot relative to the fulcrum's axis. The marking element is located on the chart side of the base plate and is secured to the bracket. The bellows includes a movable element engageable with the spool. Energization of the bellows is effective to move the movable element which engages the spool and rotate the bracket about the fulcrum resulting in the movement of the marking element in one direction across the chart. If a second slot is provided in the bracket, the spool may be located therein, with the movable element of the bellows engaging same to effect rotation of the bracket and the movement of the marking element in the opposite direction across the chart.

Claims18

Dependent claims

An instrument for recording temperatures or other information comprising a housing, a plate mounted in said housing, said plate having a pair of sides, one of the sides of said plate being adapted to carry a chart upon which information may be recorded, a non-rotatable mounting element carried by said plate and having an axis extending through said plate, said mounting element extending through the opposite sides of said plates to provide a pair of bearing surfaces, one bearing surface on each side of said plate, a rotatable bracket carried by the bearing surfaces of said mounting element, said bracket including a bridge portion extending across said plate adjacent but spaced from said axis, an arm portion at one end of said bridge portion at said one side of said plate, said arm portion having an opening for receiving one of the bearing surfaces of said mounting element, and a flange portion at the other end of said bridge portion at the other side of said plate, said flange portion including a first part having an opening for receiving the other of the bearing surfaces of said mounting element, said first part of said flange portion including a pair of slots, one slot being located on each side of said last mentioned opening and said axis of said mounting element, said flange portion having a second part including a pair of ears at the ends of said first portion, said ears being generally parallel to said axis, a non-rotatable spool located in either one or the other of said slots, an adjusting screw carried by one of said ears which corresponds to the slot in which said spool is located, said adjusting screw being threadedly secured to said spool and effective upon rotation of said adjusting screw to move said spool in said one slot in a direction generally perpendicular to said axis, a marking element secured to the arm portion of said bracket and adapted to mark the chart, an actuator secured to said plate at said other side thereof, said actuator being secured to said plate in one of two positions which depend on which of said slots and said ears employ said spool and said adjusting screw respectively, said actuator including a movable element having an axis which is generally perpendicular to and spaced from said first mentioned axis, said movable element being located on the same side of said first mentioned axis as said spool and said adjusting screw, said actuator element including an abutment surface engageable with said spool located in one of said slots, said actuator upon energization thereof being effective to move said actuator element and to thereby rotate said bracket resulting in the movement of said marking element across said chart to record information thereon.

A recording instrument comprising a housing, a plate mounted in said housing, said plate having a pair of sides, one of the sides of said plate being adapted to carry a chart upon which information may be recorded, a fulcrum carried by said plate and having an axis extending through said plate, said fulcrum extending through the opposite sides of said plates to provide a pair of bearing surfaces, one bearing surface on each side of said plate, a bracket carried by the bearing surfaces of said fulcrum, said bracket including a bridge portion extending across said plate adjacent but spaced from said axis, an arm portion at one end of said bridge portion at said one side of said plate, said arm portion having an opening for receiving one of the bearing surfaces, and a flange portion at the other end of said bridge portion at the other side of said plate, said flange portion having an opening for receiving the other of the bearing surfaces, said flange portion including a slot at one side of the axis of said fulcrum and having an ear at one end thereof which is spaced from said axis, a spool located in said slot, an adjusting screw carried by said ear, said adjusting screw being threadedly secured to said spool and effective upon rotation of said adjusting screw to move said spool in said slot relative to said axis, a marking element secured to the arm portion of said bracket and adapted to mark the chart, an actuator secured to said plate at said other side thereof, said actuator including a movable element having an axis which is generally perpendicular to and spaced from said first mentioned axis, said movable element being located on the same side of said first mentioned axis as said spool, said actuator element including an abutment surface engageable with said spool, said actuator upon energization thereof being effective to move said actuator element which engages said spool and rotate said bracket about said fulcrum resulting in the movement of said marking element in one direction across said chart.

Dependencies are inferred from the claim text.