US380872A - Recording-thermometer - Google Patents

Description

(No Model.)

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D. DRAPER. EEGOEDING THERMOMETER.

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RECORDING THERMOMETER.

No. 380,872. Patented-Apr. 10, 1888..

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UNrTED STATESg PATENT Crimen.

DANIEL DRAPER, OF HASTINGS-UPON-HUDSON, NEW YORK.

RECORDING-THERMOMETER.

SPECIFICATION forming part of Letters Patent No. 380,872, dated April 10, 1888.

Application filed November i0, 1887. Serial No. 254,743. (No model.)

To all whom it may concern.-

Be it known that I, DANIEL Daarna, a citizen of the United States, residing at Hastingsupon-Hudson,in the county of Westchester, in the State of New York, have invented certain new and useful Improvements in Recording- Thermometers, of which the following is a specification.

The invention relates to the class of apparatus employed for giving a continuous record of the variations in temperature occurring at any given point.

The object of the invention is to provide simple and convenient means for giving a permanent record, which will be exposed to view at all times during the period covered by the record-card, and to provide means for automatically giving an alarm in case the temperature rises or falls beyond predetermined limits.

The apparatus is preferably constructed in substantially the following manner: Upon an arbor of a suitable clock-train there is placed a record-chart properly divided into sections corresponding to days and hours, and by concentric circles into degrees for indicating temperature. A recording-pen, which is moved by thermostatic strips, rests upon the surface of this chart and moves toward and from its center as the temperature increases or decreases. There are provided two thermostatic strips placed at one side of the arm and constructed to bend in opposite directions under given variations in temperature. Thin wires or threads connect the ends of these arms with two cranks upon thearbor which carries the recording-arm, and they combine to move the same in the same direction. For this purpose the points of attachment are upon opposite sides of the arbor. By placing them both upon the same side of the arbor any jar to which the instrument may be subjected will not have the effect of moving the recording-arm, for the tendency of one thermostatic strip to move in one direction will be counteracted by that of the other to move in the same direction, and thus the two forces will be neutralized with regard to the recording-arm. The chart and recording-arm are protected by a glass case capable of being opened conveniently for the purpose of removing the chart and replacing it, and upon this cover there is fastened a metallic arm which carries two contact-points extending into the path of the recording-arm. These points are adjustable toward and from the center of the chart, and the plate carrying them is preferably curved to correspond to the arc described by the contact-arm, so that the contact-points may easily be adjusted opposite any required degrees of temperature as marked upon the chart. The recording-arm is preferably connected `through the frame of the machine, while the contact-points, carried upon the curved plate upon the glass cover, are also provided with a bindingpost, whereby they may be connected with an electric conductor.

In the accompanying drawings, Figure l is a front view of the apparatus. Fig. 2 is a side View, partly in section. Fig. 3 is a horizontal section, and Fig. 4 is a plan, of the support for the registering-arm.

Referring to the figures, A represents a frame, preferably of cast-iron, for supporting the various parts. This frame is included in a box, B. A suitable clock mechanism, B', is also contained in the boX B. This mechanism is of any convenient character, -preferably an eight-day movement. Upon the hour-hand b of this clock-train there is carried a plate, C, and at the center of the plate there is a post, c, upon which there screws a nut, b. Aflat pin, c', projects from the plate a short distance one side of the center. A chart, C', slips over the post c, and the pin c passes through the chart, thus preventing it from turning. Suitable clamps, c, c3, of, and ci", at the edges of the plate hold the chart in position.

Curved radial lines d d divide the chart into divisions representing the days of the week, and intermediate lines, d d', divide it into hours. These radial lines are curved to correspond to the arc described by the recordingpoint f, carried upon the end of the recordingarm F. Concentric lines e e divide the chart into other divisions serving to indicate different degrees of temperature. The recordingarm F is more or less resilient and presses the` recording-point lightly against the surface of the chart. It is carricdupon the arbor g, supported in a suitable frame or yoke, G, at the base of the instrument. This arbor is provided with two levers, H and H2, having IOO curved widened faces. These faces are grooved to receive thin wires or cords 7a and h2, rcspectively. IThe wire h is fastened at one end to the end of the thermostatic strip K, and the end of the wire h2 is fastened to the end of a thermostatic strip, K2. rlhe ends of the two strips are so located as to lie in planes parallel with the points of attachment of the wires to the curved levers. The other ends of the thermostatic strips are secured tothe frame A. The strips are reversed with reference to each other, so that any change of temperature will tend to bend one-strip toward the arbor g and the other strip away from the arbor, so that the two strips combine to move the arbor, and thus the recording-arm. Any jar which is given to the machine will be absorbed by the two arms, so that no resultant effect will be manifest upon the recording-arm. The arm F is preferably loosely mounted upon the arbor g,- but it is provided with an extension, f', passing between two adjustable set-screws, f2 and f, turning through lugs in a bracket, f, which is rigidly attached to the arbor, and by means of these screws the position of the recording-point with reference to the chart and the thermostatic strips may be very nicely adjusted. The levers H and H2 are preferably also adjustable upon the arbor 0, being held in position by the set-screws lr and It".

For the purpose of giving an alarm in case the temperature exceeds or falls below any predetermined limits there is attached to the glass front plate, M, with which the case is closed, a curved plate, a. This is fastened by studs passing` through suitable holes formed in the glass and cushioned by washers n and a?. The plate a is curved to correspond with the are described by the recording-point, and it is provided with a longitudinal slot,m,th rough which there extend two limiting-stops,p'and p2. These are bound in any required position by the nuts p, and theyare respectively provided with contact-pins t and t2, which are preferably of platinum. Platinum points may be also formed upon the portion ofthe recording-arm F which is opposite the pins, if desired. By adjusting the pins above the points on the chart which indicate any desiredlimits of temperature the alarm will be sounded when either of these limits is reached. The

binding-post P is fastened to one end of the curved plate a, and the second binding-post,

I, is fastened to some portion of the frame or case of the instrument, and these two binding-posts constitute the terminals of any suitable alarm-circuit. The connection from the binding-post P'l to the arm F will be through the frame of the machine, the arbor g, also the wires 7L and h2, (in case metallic wires are employcd,) and thus with the recordingarm F. It will be seen that as the alarmplate a is fastened to the glass plate it will be swung out of the way of the recording-arm when the door is open to replace the chart. Moreover, when the door is closed the points cannot be reached, so that unwarranted access to the contact-points will be prevented.

I claim as my inventionl. In a recording-thermometer, the combination, with a clock-movement and a chart carried thereby, of thermostatic strips, a rccording-lever actuated thereby, a plate extending over the chart,and insulated contact-points carried upon said plate and adjustable by reference tothe chart to any desired points thereon, said points constituting one terminal of an electric circuit, said recording-arm constituting the other terminal.

2. In a recordiiig-thermometer, the combi nation, with the recording-arm, the revolving chart, and the thermostatie strips for moving the arm with reference tothe chart,oftheplate placed in front of said chart and carrying limiting contact-stops adjustable to any desired points in the divisions on the chart, said stops being designed to constitute the terminals of an electric circuit, substantially as described.

3. In a recording-thermometer, the combination, with the recording-arm, of the chart, the limiting-stops adjustable with reference to the divisions upon said chart, a support for said stops, the plate of insulating material carrying the support in front ofthe chart, andthe bindingpost attached to said support and extending through said plate, whereby electrical connection may be made with the supportentside of the plate, substantially as described.

ln testimony whereof I have hereunto subscribed my name this 9th day of November, A. D. 1887.

DANIEL DRAPER.

Witnesses:

J ENNIE P. AsHLEY, CHARLEs A. TERRY.

ICO

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