US392310A - brewstee - Google Patents

Description

3 Sheets-Sheet 1.

(No Model.)

W. P. BREWSTER. RECORDING THERMOMETER.

No. 892,310. Patented Nov. 6, 1888.

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3 SheetsSheet 2.

' (No Model.)

' W. P. BREWSTER.

RECORDING THERMOMETER.

No. 392,310. Patented Nov. 6, 1888.

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(No Model.) 3 Sheets-Sheet 3. W. F. BREWSTER.

RECORDING. THERMOMBTER,

No. 392,810. Patented Nov. 6, 1888.

a vvcmwwof I I jvwowtoz UNITED STATES PATENT @FFIQEO IVILLIAM F. BREWSTER, OF EAST ORANGE, N WV JERSEY.

RECORDENG=THERMOMETER SPECIFICATION forming part of Letters Patent No. 392,310, dated November 6, 1888.

Application filed January 11, 1888. Serial No. 260,400.

To all whom, it may concern:

Be it known that I, WILLIAM F. BREWSTER, a citizen of the United States, residing at East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in RecoMing-Thermometers, of which the following is a specification.

This invention relates to improvements in what are known as recording-thermometers-that is, thermometers which make on a sheet or tablet a record of the temperature during a given period of time, so that they can be adjusted, and during or at the end of any such period of time the temperature ofanyparticular point of time in such period can be told at a glance upon the sheet or tablet, and, as usually constructed, such record can be pre served for future reference, if so desired.

The present improvements consist in certain details of construction whereby such thermometers are rendered more certain in operation, more convenient in use, defects are remedied, and advantages are obtained, and they relate more particularly to and consist more especially in, first, a holder carrying a marking medinm-such as an inked or carbonized ribbon or sheet-said holder being so constructed and arranged that itis independent of and does not move with the recording-sheet when the latter is moved in making a record; second, a movable holder carrying a marking mediumsuch as an inked or carbonized ribbon or sheet-said holder being so constructed and arranged that it is independent of and does not move with the reodrding-shcet when the latter is making a record, and with the marking medium can be moved away from its position, so that the recordingsheet may be more readily changed or adjusted in position; third, a compound lever for causing the point or stylus (which is brought into contact with the marking medium and recording-sheet to produce a record) to move a greater distance in the same space of time, thus striking a quicker blow and lifting more quickly after the blow has been struck, and also enabling the point at which the lever is secured to the frame to be at greater distance from the cam which actuates said lever, and thus requiring less power for its operation; fourth, a springbuffer for giving -a quick rebound to the sty- (X0 model.)

Iusarm; fifth, the spring-connection of the stylus-arm to the free end of the bimetallic thermometers, so that the arm will move readily toward and away from the recording-sheet when making a record; sixth, a pivoted recording-sheetsupporting frame, whereby the frame can be swung up to allow access to the clock mechanism or when placinga new sheet thereon.

In the annexed drawings, Figure l. is a front View with a portion of the recording-sheet broken away to give a better view of the connection between the hammer mechanism and clock-work which moves the recording-sheet. Fig. 2 is a side view; Fig. 3, a detail section on line 10 10, Fig. 2; Fig. 4, a detail rear view; Fig. 5, asection on line o r, Fig. 9. Fig. 6 is a side View, and Fig. 7 a top view, of the strikersprings; Fig. 8, a sectional and side view ofa portion of the device; Fig. 9, a side view looking at the inside of the back wall; Figs. 1O, l1, 12, 13, and 14-, modifications.

The letter A represents aportion of the case which is to contain the various parts of the mechanism. The back wall, a, is preferably a metallic plate,upon which the various parts of the mechanism are fastened. In the walla of the case is out a hole, a in which is countersunk the flanged end I) of a post, B, by

means of screws 1), Fig. l. Projecting rearwardly from this post 13 is the bracket G,hav ing the vertical arm 0. To this arm 0 is socured one end, (Z, of a bimetallic helical thermometer, D, the other end, 0, of which is connected to a shaft, (2 which passes through the post B and carries on its projecting end (P the arm E,having thelower shorter weighted portion, 6, and thenpper longer portion, 6. To the top of this arm, on the under side, is secured apin or stylus, e",and to this top is also secured afinger, e, which projects up beyond the end of the upper longer portion, 0, and serves as a pointer or indicator; or the finger e may be omitted.

In the drawings I have shown the arm E as being connected to the shaft d" at a right angle thereto, which I consider the preferred form; but it will be manifest to any mechanic that the arm might be connected to the shaft at an angle other than a right angle and yet have it serve its purpose.

To the rear side of the arm E there is rigidly secured the upper end, f, of a spring, F, the lower end, f, of which bears loosely against a stud, f upon a sleeve, f which is keyed to the shaft (Z between the arm E an the post B.

Secured to the wall a back of the arm E is the recording mechanism, the clock portion G of which is of the ordinary construction, and which carries the operative cam-wheel II. This canrwheel H has the four cam-sur faces 9, such surfaces being given acurvature which makes them quick cams, so as to quickly lift the lever II and form a crown-wheel with camteeth. Below the clock mechanism a post, it, projecting from the wall a, has pivoted to it the lever H, which is one portion of the com pound lever. This lever has the stem h, the cross-bar h, finger h and top arm, h", provided with the vertical slot it", the finger h" projecting across the face of the cam-wheel II and in the path of the several cam surfaces or teeth.

Secured to the wall a is a bracket, t, and to the frame of the clock mechanism another bracket, t. To these brackets is secured a rod Z on which are hinged the arms i '17, one at each end of the rod '5 and a cross bar, i, connecting the free ends of the arms, forming the hammer or striker I. The lever H and the hammer on striker I form a compound lever. This cross-bar has a sharp edge, L and the hammer or striker is so arranged on the rod 4" that the striker is on the side of I the arm and stylus away from the recording sheet. A. pin, 2', enters the slot h". Surrounding the rod Z is a spiral spring, k, one end of which bears on the striker or hammer I and the other end against the bracket Z. This springis arranged so that its free resilient action will throw the striker I against the arm E. To the clock-frame there is secured a spiral or other buffer-spring, K, just back of the lever H.

To one side of the wall a there is secured a stud or arbor, on which is pivoted a frame,L, which carries the recording-sheet support M and the gear-wheel Z, which drives it. This gear-wheel Z meshes with the geared pinion Z of the clock mechanism. This frame L has a portion, Z", which lies next to the plate a, which plate has a bar, Z, attached to it, so that the portion of the frame Z can move up and down between the plate a and bar Z. The end of Z extends beyond Z and is provided with a spring-catch, Z which engages with a hole, Z, or with the top of the wall a, as the frame is either up or down. A stud, Z limits the upward movement of the frame L; also, to hold the frame L more rigidly in place when the gear-whecl Z is connected with geared pinion Z the slot Z fits closely around and under the head of stud-screw Z. The recording-sheet support M has the usual recording-sheet, N. The support M has a smooth-bored hub, m, through which projects the end of arbor Z, with eatches,m.

hub resting against a shoulder, m, the outer Z screwing into thumb-nut N,Fig. 1. Hinged to edge of support M are several spring- The recording-sheet N is centered around the end of arbor Z and snapped under spring-catchesm. The binding-disk n is placed over paper recording-sheet N,and the thumbnut N, being screwed down, binds the paper recording-sheet N to its support M, and the pressure of thnmbnut N firmly holds the sup port M and recording-sheet N from turning on arbor Z, because the hub m is bound against shoulder of arbor m".

Projecting at right angles from wall-plate a on theleft-hand side of support M and nearly opposite to its axis is the'hollow bored post O,through which passes the shaft 0 from IV to WV, Fig. 2. The shaft 0 is shouldered on the post 0 at 0", and is on the extreme outer end keyed to the crank-lever X by a setscrew, m. At the other inner end of the shaft 0 is hinged a holder or bridge, P, by a knife-blade spring-joint, 0. This holder consists of a horizontal bar, with two vertical ends, pp', having cars 11 1)". Through these cars p r pass the ribbon or sheet holding bobbins QQ, having the usual tension-springs, q q. On these bobbins is held the inked or carbon ribbon or sheet R, which is fed, as occasion requires, from one to the other, forming what I have termed a marking medium. The holder is so arranged that the marking medium It is held underneath the stylus c" of arm E and between the stylus e and the recording-sheet N. This recording-sheetN is subdivided with radial lines denoting divisions of time and concentric lines denoting degrees of temperature.

To enable the face of the recordingsheet to be exposed, so that the stylus c of arm E may be set at the proper hour, the holder P has a dual vmovementa motion parallel with the plane of the reeordingsheet, which enables the rib bon or sheet R to move from under the stylus e and clear of end of arm E, and a movement parallel to the axis of the recording-sheet, (on theknife-bladejoinh) which throws the holder P entirely clear of recording -sheet N, and leaves it parallel with the shaft 0 and post 0. The movement parallel to the plane of the recordingsheet is obtained by the shaft 0 revolving in post 0, and this movementislimited to clearing the arm E by the crank-lever X striking against the stud-screws 0c 2:", Fig. 4-, the spring :0 holding the holder P in place under stylus 6 when the instrument is in operation. To remove holder P from contact with reeordingsheet N, first swing the righthand end of holder P till it clears stylus e or pointer e of arm E, and then lift the end of the holder P until the knife-blade joint holds it parallel with shaft 0 and at right angles with plane of recording-sheet N. To replace the holder P and marking medium E again in position, reverse the dual motion. lVhen across the face of recording-sheet N, the knife-blade spring-joint 0 will hold the holder in one position as the spring x does in the other. On the holder 1? is a thermometric scale, S, the same being identical with that which is on the recording-sheet just underneath the scale.

The object of scale S is, first, to adjust the arm E so that it will indicate and register the proper temperature, and, second, being correctly adjusted, the temperature being at any time registered under the marking medium It by the stylus e on recording-sheet N can be read by the degree indicated on the scale Shy the finger or pointer e".

In Figs. 10 and 11 is shown a modification of my recording thermometers, in which a thermostatic strip is used instead of the helical thermometer. A thermostatic strip, Y, is secured at one end in the bindingpost Fig. 10, which post y* is secured to the back of wallplate a. The free end of strip 9 has a pin, 1, which enters slot 12 of the lever V, the other slotted arm, 0, in which enters a crank-pin, t, of the crank T, which is secured to the shaft d by the set screw T Figs. 10 and 12. Both the pin gf" and the crank-pin if (as to the width of the slots) accurately fit said slots in lever V. As the thermostatic strip Y is affected by the change in temperature, it moves to the right or left from a straight position, and the pin y'fithrough the lever V,causes the shaft (1' to move the arm E across the face of the recording-sheet N in the same manner as by means of the helical thermometer.

The object of the slot is twofold: First, it provides for the shortening or lengthening of the thermostatic strip Y as it curls from or returns to a straight position, and, second, the crank-pin t being adjustable as to its distance from the axis of d by the set-nut t the slot 1 provides for this change in leverage of crank T, as the slot 1) provides for the change in the lengthening and shortening of strip Y. The

change in the distance of the pin i from the axis of crank T is to provide a means of changing the range indicated on the scale S and recorded on the recordingsheet N, as is hereinafter described.

In Figs. 12 and 13 is shown another modification. Here the compensating lever-Visdis pensed with, and the crank-pin if, instead of entering the slot in slotted arm 12 of lever V, enters a slot made at the end of the strip Y at the point where the pin y" is placed in the modification illustrated in Figs. 10 and 11, the result (the turning of the crank T by means of the strip Y) being the same in both modifications.

In set screw (2" in Fig. 2 and T- in Figs. 10 and 12 a means for setting the arm E is provided, so that the stylus 6 may record on recordingsheet and finger 6 may indicate on scale S the correct temperature.

The clock mechanism is wound up, and to wind the top spring the recording-sheet support M is thrown up out of the way, so as to give access to the upper winding-post. The holder P is placed across the recording-sheet, as heretofore described, and with the marking medium between the stylus and the re cording-sheet, with the ribbon It properly inked or carbonized. The whole device is dulyincascd in a suitable case and put in place with the thermometer projecting within the space the temperature of which is to be recorded. As the thermometer varies in its expansion and contraction, so the arm E will be swung to the right or the left. Meanwhile the clock mechanism, unwinding, turns the camwheel G, so that the cam-surfaces 9, bearing against the finger 7L3, move the striker or hammer I on the rod Z away from the arm, the slot h allowing for the necessary play. This movement compresses the spring 7.. As soon as a given surface, 9, passes the finger It", the spring 7v quickly throws the striker or hammer against the arm E, causing the stylus c to strike the marking medium,R-,and mark the recording-sheet N. The shock upon thepoint-er is taken up by the spring F, and the stroke of the striker or hammer I and the lever H is taken up by the buffcrspring K. The camwheel making one revolution per hour and there being four cam-surfaces, the arm strikes the marking medium once every quarter of the hour and the recordingsheet only moves after each stroke a sufficient distance to allow of another stroke. Hence the points made upon the recording sheet appear as a continuous line.

To adjust the arm E so that when operated by the helical thermometer D it shall indicate and record the correct temperature, loosen set-screw d in arm 0, so that shaft (1 is free to revolve; then, having moved the finger (f of arm E so that it points to same degree on scale S as shall be at the time indicated on a standardized thermometer by which the adjustment is made,while retaining the finger or pointer 6 so it points to the correct degree of temper ature, (as indicated on a standardized thermometer,) fasten the shaft (1* in arm 0 by screwing down the set-screw (P.

To adjust the arm E when operated by the thermostatic strip Y, loosen the setserew T in the crank T until the shaft (1 is free; then, having set the finger c on arm E on scale by a standardized thermometer, hold the arm at the then correct temperature and fasten the crank T on shaft d by screwing down the setscrew T being careful to let the position of the crank T on shaft (Z be that which the free action of strip Y has given it.

To change the range of the arm so that the number of degrees indicated on the scale S and recording-sheet N may be greater or less, loosen the nut t on lower end of crank-pin 2?, so that it will slide in crankslot '6. To increase the rauge, move the pin t away from axis of (P, and the range can be decreased and the arm E made to move a greater distance orgreater part ofacircle to each degree of temperature by moving the pint nearer to the axis of (I -that is, the radial lines in drawings represent one-twentieth of a circle and the range of the scale in drawings is 60 Fahrenheit.

I have herein shown and described my improvements as applied to a recording-thermometer of the preferred form or construction; but it is manifest that they could as readily be applied to other forms or construe tions than the one here selected. It is also manifest to any mechanic that the form or construction of the holder P and marking medium R, as well as that of the compound lever I, could be somewhat changed and yet have the holder P, medium 1?, and compound lever I perform the same functions in the combina tion of parts hereinafter claimed as the special form or construction herein shown and described. Therefore Ido not wish to limit my selfto the exact form or construction herein shown and described; but

\Vhat I claim,and desire to secure by Letters Patent, is-

1. In a recordingthermometer, the combination, substantially as set forth, of a recording-sheet, a mechanism for moving the same, a bimetallic thermometer with its free end connected to an arm, a stylus on said arm, a holder independent of the recording-sheet, a marking medium mounted on said holder and disposed between the recording-sheet and stylus, and a hammer connected with the mechanism for moving the recording-sheet, and arranged to strike the stylus against the marking medium and recording-sheet at stated intervals of time,whereby the recording-sheet will be caused to move and receive upon it marks made by the marking mechanism and stylus when the latter is forced against said sheet by the action of the hammer, and thus make a record of the temperature during a given period of time.

2. In a recordingthermometer, the combination, substantially as set forth, .of a recording-sheet, a mechanism for moving the same, a bimetallic thermometer, a shaft connected with the free end of said thermometer and thereby rotated, an arm secured at an angle to said shaft and provided with a stylus, a holder independent of the recordingsheet, a marking medium mounted on said holder and disposed between the recordingsheet and the stylus, and a hammer connected with the mechanism for moving the recording-sheet, and arranged to strike the stylus against the marking medium and recording-sheet at stated intervals of time, whereby the recordingsheet will be caused to move and receive upon it marks made by the marking medium and stylus when the latter is forced against said sheet by'the action of the hammer, and thus make a record of the temperature during a given period of time.

3. In a recording-thermometer, the combination, substantially as set forth, of a recording-sheet, a mechanism for moving the same, a bimetallic thermometer with its free end connected to an arm, a stylus on said arm, a movable holder independent of the record ing'sheet, a marking medium mounted on said holder and disposed between the recordingsheet and the stylus, and a hammer connected with the mechanism for moving the recording sheet, and arranged to strike the stylus against the marking medium and recordingsheet at stated intervals of time, whereby the said holder can be moved from between the recording-sheet and stylus or away from said rccording-sheet when it is to be changed, and also return to its position for making a record.

4. In a recordingthermometer, the combination, substantially as set forth, of a recording-sheet, a mechanism for moving the same, a bimetallic thermometer with its free end connected to an arm, astylus on said arm, a holder independent of the recording-sheet and carrying a marking medium, the medium being disposed between the recordingsheet and stylus, and a compound lever constructed substantially as described and connected to the mechanism for moving the recording sheet, whereby the stylus will be forced against themarking medium and recordingsheet with a quick blow, and the stylus will be quickly relieved from the pressure of the hammer portion of said lever, and the stylus be left free to be moved by the bimetallic thermometer, and aclearer and more nearly correct record be made.

5. In a recording-thermometer, the combination, substantially as set forth, of a recording-sheet, a mechanism for moving the same, a bimetallic thermometer with its free end connected to an arm, a stylus on said arm, amovable holder independent of the recordingsheet, said holder moving on a knife-blade spring-joint, a marking medium mounted on said holder and disposed between the recording-sheet and the stylus, and a hammer connected with the mechanism for moving the recordingsheet, and arranged to strike the stylus against the marking medium and recording-sheet at stated intervals of time, whereby the said holder can be moved from between the recording-sheet and stylus or away from said recording-sheet when it is to be changed,and also return toits position for making a record,and when so moved saidholder will be held in either oftwo positions by the ac tion of the knifehlade spring-joint.

6. In a recording-13hermometer, the combination, substantially as set forth, of a recording-sheet,a support for such sheet, mechanism for moving the recordingsheet to make a rec ord, and a movable connection between the recordingsheet support and the mechanism for moving the recording-sheet to make a record, whereby the recording-sheet, with its support, can be moved to connect or disconiio nect the recording-sheet support to or from the as described and connected to the mechanism mechanism for moving the recording-sheet. for moving the recording-sheet, and a buffer- 7. In a recording-thermometer, the combispring, whereby the compound lever is more nation, substantially as set forth, of a recordquickly moved away from the arm connected 15 5 ing sheet, a mechanism for movingthe same, a to the bimetallic thermometer and a more perbimetallic thermometer with its free end confeet record is made.

nected to an arm, a stylus on said arm a T w T n holder independent of the recording-sheet a nd ILLIAM SLER' carrying amarking medium,the medium being \Vitnesses: IO disposed between the recording-sheetand sty- 1 Lotus LAFRANOE,

lus,acomponnd lever constructedsubstantially HENRY T. GRAY.

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