USRE19902E - Pressure gauge - Google Patents

Description

March 24, 1936. P. T. sPRAGuE Er A1. Re. 19,902

PRESSURE GAUGE Original Filed Oct. 8, 1926 2 Sheets-Sheet 1 48 6 im l, j di?? IIJ; 1.,.:1 I

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Reiuued Mar. 24, 1936 19.902 PRESSURE GAUGE Philip Tripp Sprague and Arnold Soller, Michigan City, Ind., assignors .to The Hays Corporation,

Michigan City, Ind.

Original No. 1,841,651, dated 140,315, October tion for reissue January 15, 1

Serial No.

16 Claims.

' Our invention relates to improvementsin gauges that are designed to be used for indicating or recording pressures, and it consists in the combinations, constructions, and arrangements herein described and claimed,

An object of our invention is to provide a gauge primarily i'or indicating relatively slight pressures, such as drafts in chimneys, furnaces, and the like, and in which the movement of a diaphragm is greatly multiplied so that a slight change in the pressure may be readily observed on the scale at a considerable distance from the latter.

A further object is to provide a gauge of the type mentioned, which is housed in a casing that is relatively narrow, so thatV a number of these gauges may be placed side by side on an instrument board or other suitable support where they will take up very little room.

A further object is to provide a gauge in which' the actuating mechanism is disposed in compact arrangement in one end of the housing, thereby permitting a wide range of movement for the pointer through the space in the remainder of the housing.

A further object is to provide a device having an elongated diaphragm, by means of which a slight pressure is augmented, but which, being elongated. may be readily contained within the narrow housing.

A further object is to provide a device of the type described in which a spring member actuated by the movement of the diaphragm is bent back over the diaphragm casing, thereby rendering the device compact,l while at the same time providing a long lever arm.

A further object is to provide simple means operated from the outside of the casing for adjusting the device to bring the pointer to its zero position.

A further object is to provide novel and simple means for Calibrating, amplifying and transmitting movement of a diaphragm to a pointer.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

Our invention is illustrated in the accompanying drawings, forming part of this application, in which Figure l is an enlarged section through the device along line I-I of Figure 3,

Figure 2 is a face view of one of the scales used in the device,

Figure 3 is a face view showing the general ar- January 19, 1932, 8, 1926. .Applica- 934, Serial No.

rangement of a by side,

Figure 4 is a detail device, Figure 5 is a face view Figure 6 is a detail side vi their immediate actuati Figure 5,

plurality of gauges mounted side plan view of a portion of the of a modified form,

ew of the pointers and ng mechanism shown in Figure 8 is a section ure 1,

along the line 8-8 of Fig- Figure 9 is a detail sectional view along the line I I' of Figure 3 showin the diaphragm casing,

Figure 10 is a view spring arm used in c tus set forth in Figure 5.

In carrying out our inventi ing such as that shown in Fi g a means for mounting of a modified form of the onnection with the apparal on we provide a housgure l. It comprises a at strip of metal bent to form a top portion I,

a back portion 2,

and a bottom portion 3.

The

front consists preferably of cast aluminum side Y pieces 4, which are ing flanges 4a, see 8. The sides are cross piece 6. 'I'he low is bent upwardly and piece `I.

A scale such as that shown at I0 and 3 is bent in arc shape and is sec provided with laterally extend- Figure 7, and ribs 5, see Figure connected together by upper and lower cross members 6 and l, respectively, arc shaped pane of glass e flange 4a and the rib 5 the grooves of the upper 6 and `I, and is suitably packed to prevent displacement. tion I of the casing or housing is The Upper P01'- secured to the of the casing to the cross er portion is secured in Figures 1 ured to upper and lower brackets II and I2, respectively, which are in turn secured to the upper an bers of the casing.

substantially L-shape. I3a and screws Il passin into the bosses for holding the and there d lower mem-l In the interior is disposed a light casting I3 of This casting has bosses g through the casing and casting or frame also has a central boss h is provided with an I 3 hic ng consists of a lower por- I9 provided with a threaded asses through the openleo casing are held 2 tion I8 securely down on the Vboss i3, thereby holding it firmly in podtion.. h

clamped -between thecasing portion I8 and a cover portion 23 is a diaphragm2l.- As will be observed from Figure 4, the diaphragm casing is elongated and is provided with bosses 25 having screws 28, bymeans of which the two parts of the together. This diaphragm is made preferably of curely held between the edges of the casing portions I and 23. The diaphragm itself is not taut, but is preferably loosely crinkled or corrugated before being secured in position." This is done generally by wadding skin and rolling 1t between the hands preparatory to securing it in position. On each side of the diaphragm are metal by a nut 28 on a bolt 23, which projects through an opening '30 in the member. 23 of the casing.

Secured to one end of the |.-shaped frame I3 by means of a bolt 3l is a relatively thick U- shaped spring member 32. The frame I3 is slotted at 32a to allow for theshifting of a spring 33 for the purpose of keeping the spring at right.

angles to the bead chain. The spring member 33 is relatively thin and is carried by the U- shaped spring member 32, being fastened to it at 34. This spring member 33 extends substantial- 1y parallel with the diaphragm casingV and has along a portion of one side adjacent its outer end a brace member 33 consisting of an integral strengthening rib formed in a blanking and forming operation. Between the brace member and the fastening means 3l, the spring 33 is-connected tothe bolt 23. The outer end of the spring member 33 is slotted to receive the end of a bead chain 36. The latter passes around a wheel or pulley 31 which is mounted on an axle 38 journaled in bearings 39 carried by the forked ends Ml of the frame I3. Secured to the wheel 31 is the end '4I of a pointer arm 42. The latter extends forwardly to one side of the scale I0 and is provided with a laterally extending pointer 43. Since the scale Ill is curved on an arc concentric with the axis of the arm, the pointer 43 will swing along the scale at uniform distance therefrom. A plate la: is provided, as shown in Figure 8, for preventing the light from shining through between the edge of the scale and the casing.

The spring arm 33 .may be adjusted with respect to its support and with respect to the connection to the bolt 29, and to this end slots Mv and I5 are provided as shown in Figure 10. An adjusting screw I6 extends through the casing wall 3 and bears on the spring portion 32.

From the foregoing description of the-various parts of the device, the operation thereof may be readily understood. The meter is designed to be attached to any suitable supporting surface and to this end lugs l1 are provided which may be secured by bolts I8 to a panel 43 or other convenient supporting surface. To the end of the threaded member 2li, a flexible pipe 50 may be attached, and the end of this pipe may lead to a chimney. a furnace, or other'device whose pressure or draft it is desired to indicate. The pressure from a fan, for instance, will cause a force which will act upon the diaphragm 24, moving it upwardly in Figure l, and causing the spring 33 to rise. The wheel 31 has an adjustable counterweight 5|, consisting of a pair of nuts. which may be locked together in adjusted positions so that when slack comes on the chain it will cause the arm to rise, thus shifting the pointer along the goldbeaters skin and is seweight,

,the gauges are sent vout they plates 21, which' areheld 'large opening at O Scale,

for calibrating, amplifying and .-transmitting chain 38. Should it be desired to measure a decrease in normal pressures, such as a partial vacuum, the air-pressure will move the diaphragm in the opposite direction, pulling down on the spring and causing the swinging of the armv downwardly against the force exerted by the counterso that the pointer willregister on the lower part of the scale the extent of the decrease in pressure from' the, normal. Of course before are calibrated and the pointer should stand at zero on the scale when the pressure is normal. 1f the pointer is not exactly at zero,.it may be brought to the zero position by means oi the screw I6 which may be turned to exert or relieve pressure. on the spring 32. This may be done from the exterior of the housing without the necessity of opening it.

The construction described permits the use of plain flat plates for the sides of the housing or casing.

VIn Figure 5 we have shown a modified form of the device in which one housingserves for two pointers. In this figure the housing, which we have indicated in general at H, has a relatively I in the figure through which the pointers P and P can beseen, and has two sets of diaphragms in the respective casings D and D. The spring arms S and S are connected, respectively, by means of chains with the wheels W and W' shown in Figure 6, which are connected with the pointers P and P'. The operation of this form of the device is the same as that already described. In this instance, however, the inlets to the diaphragm casing which are shown at K and K', respectively, may be connected to two different sources of `pressure so as to give two readings in the single instrument. In this instance, as in the form shown in Figure 1, the diaphragm casings and their springs are disposed in compact arrangement at the ends of the housing so as to leave the greater part of the space within the housing for the free swing of the pointers. Both of these devices have adjusting screws A and A', by means of which the pointers may be brought to the zero position.

It will be noted that in both forms of the device elongated diaphragms are used and, as stated, this permits an instrument which may be made very narrow. We have found that an elongated diaphragm works as well, as far as vtransmission of pressure is concerned, as a circular diaphragm of the same area. By making the diaphragm elongated instead of circular, we gain the advantage of utilizing the available space in the compact case for useful purposes.

While we have illustrated a scale which is graduated in fractions of an inch (water), the instruments made on the same principle may be made for indicating greater pressures, such as blast pressure of 6 or 8 inches (water) or 30 inches water pressure for powdered coal air lines. The scale may be calibrated to read in inches mercury, in millimeters water or mercury. or in ounces and pounds per square inch, as well as in the units mentioned. 'I'hese may be in pressure above atmospheric pressure, or suction (pressure below atmospheric), or the difference between pressures at two sources. Where the atmospheric pressure is taken as the standard-of comparison, only one connection is necessary since the instrument itself is surrounded by atmospheric pressure said spring thus serving as' simple means A which is naturally applied to the opposite side of the diaphragm.

I'he compact arrangement, in which the elongated diaphragm casing has a spring bent over it in parallel relation with an arm actuated by the spring at its outer end, enables u's to multiply the movement of the diaphragm so that the pointer will move to a relatively great' distance for a very slight pressure or vacuum, thus making a very sensitive instrument, but one which can t be easily read at some distance from the gauge.

secured to a wall of the housing and having an inlet, a substantially rectangular diaphragm carried in said elongated casing, the surface o1' the diaphragm being crinkled and the edges being securely held by the walls of the diaphragm casing,

a U-shaped spring portion rigidly secured in said housing and surrounding one end of the diaphragm casing, an adjusting screw mounted in the wallof the housing and arranged to engage the spring portion for ilexing the latter, a relatively thin spring member secured to said U` shaped spring portion and extending substantially in parallelism with the diaphragm casing, a connection between said diaphragm and said spring member for moving the latter, a pointer arm pivotally mounted to swing in a plane substantially through the center of thehousing and the longitudinal axis of the diaphragm, a wheel secured to the arm at its pivotal point and carrying a counterbalance for the arm, a bead chain for connecting the spring member with said wheel for moving the pointer arm, and an arc-shaped scale at one end of the housing, said scale being concentric with said wheel, and cooperating with the free end of the arm.

2. A pressure gauge, comprising a housing, an elongated diaphragm casing secured to a wall of the housing and having an inlet, an elongated diaphragm carried in said casing, the edges oi the diaphragm being held by the walls oi the casing and the body portion being crinkled, a spring member extending substantially in parallelism with the diaphragm casing, means for securing said spring member to said housing, aconnection between said diaphragm and said spring member for moving the latter, a frame, a pointer arm pivotally mounted on said frame to swing through the greater portion of the housing, a wheel secured to the pointer arm at its pivotal point and carrying a counterbalance for the arm, exible means for connecting the spring member with said wheel for moving the pointer arm, and an arc-shaped scale at one end of said housing, said scale being concentric with said wheel, and cooperating with the free end of the arm.

3. In a pressure gauge, a housing, an elongated diaphragm casing secured within the housing, a substantially rectangular diaphragm carried in said elongated casing, the surface of the diaphragm being crinkled and the edges being securely held by the walls of the diaphragm casing, a spring member disposed in parallelism with the diaphragm casing,-connections between' said dia- 'phragm and said' spring member ior moving the latter, and means operated from without the vhousing for adjusting the position of the spring member.

4. In a pressure gauge, a housing, an L-shaped frame secured to said housing, a pointer arm pivotally mounted on one end of said L-shaped frame, a U-shaped resilient member having one leg mounted at the other end ot said Lshaped trame, a spring member mounted on 4the other leg ot saidU-shaped resilient member and extending toward the rst-named end oi' the frame,

a diaphragm casing mounted on said frame between the spring member and the i'rame,'a diaphragm carried in said diaphragm casing, connections between said diaphragm and said spring member for moving the latter, and connections between the spring member and the pointer arm for actuating the pointer arm.

5. In a pressure gauge, a housing, a frame disposed in said housing, an elongated diaphragm casing secured to said frame, a diaphragm disposed n said casing, a. spring member disposed in parallelism with said diaphragm casing and secured to said frame, a pointer having its longitudinal axis disposed in the same plane with l the longitudinal axis of the spring member and being pivoted at one end, connections between said diaphragm and said spring member for moving the latter, and connections between the spring member and the pointer for moving the pointer.

6. In a pressure gauge, a housing, an elongatedv diaphragm casing secured within the housing, a diaphragm in said casing, a spring member disposed in parallelism with the diaphragm casing on one side thereof, a U-shaped resilient member having a portion bent around the end of the diaphragm casing and arranged to extend in parallelism with the opposite side of the diaphragm casing, means for securing one end of said U- shaped member to the housing, means for securing the other end of said U-shaped member to one end of said spring member, connections Abetween the diaphragm and the spring member for actuating the latter, a pointer pivotally supported at one end and having its longitudinal axis disposed in the same plane with the longitudinal axis of said spring member, and means for connecting the free end of said spring member with the adjacent end of the pointer for moving the pointer.

7. In a pressure gauge, a housing, an elongated diaphragm casing secured within the housing, a diaphragm in said casing,a spring member disposed in parallelism with the diaphragm casing on one side thereof, a U-shaped resilient member having a portion bent around the end of the diaphragm casing and arranged to extend in parallelism with the opposite side of the diaphragm casing, means for securing one end thereof to the housing, means for securing the other end of said U-shaped memberto one end of said spring member, connections between the diaphragm and the spring member for actuating the latter, a pointer pivotally supported at one end and having its longitudinal axis disposed in 8. In a pressure gauge, a housing, an elongated diaphragm casing 'secured within the housing, a diaphragm in said casing, a spring member `disposed in parallelism with the-diaphragm casing on one side thereof, a U-shaped resilient member having a portion bent around the end o! the diaphragm casing and arranged to extend in parallelism with the opposite side of the diaphragm casing, a frame for rigidly securing one end of the lU-shaped resilient member. to the housing, means ior securing the other end of said U-shaped resilient member to said spring member, connections between the diaphragm and the spring member for actuating` the latter, a pointer having its longitudinal axis disposed in the same plane with the longitudinal axis of said spring member, an extension carried by said frame for pivotally supporting said pointer, connections between the pointer and the spring member near the pivotal support of the pointer for turning the pointer on its pivot, and a curved scale adjacent to the free end of the pointer for indicating the movement of the pointer.

.9. In a pressure gauge, a housing, an elongated diaphragm casing secured within the housy ing, a diaphragm in said casing, a spring member disposed in parallelismwith the diaphragm casing on one side thereof, a U-shaped resilient member having a portion bent around the end of the diaphragm casing and arranged to extend in parallelism with the opposite side of the diaphragm casing, a frame for rigidly securing one end of the U -shaped resilient member to the housing, means for securing the other end of said U-shaped resilient m'ember to said spring member, connections between the diaphragm and the spring member for actuating the latter, a pointer having its longitudinal axis disposed in the same plane with the longitudinal axis of said spring member, an extension carried by said frame forf pivotally supporting said pointer, connections between the pointer and the spring member near the pivotal support oi' the pointer for turning the pointer on its pivot, a curved scale adiacent. the free end of the pointer for indicating the movement of the painter, and a set screw carried by the housing and arranged to bear on the resilient member for flexing the latter.

10. A pressure gauge, comprising a housing, a frame disposed in the housing and having extensions, an elongated diaphragm casing. a substantially rectangular diaphragm carried in said elongated casing, a spring member disposed in parallelsm with the diaphragm casing, means.

whereby said spring member is carried by said frame, a connection between said diaphragm and said spring member for moving the latter when said diaphragm is moved, a pointer arm pivotally mounted in a plane substantially common to the central axis of the spring member, means connccting the end of the spring member with said pointer for movingthe latter about its pivot, and an arc-shaped scale at one end of said housing for indicating the movem'entof the pointer arm.

11. In a pressure gauge, a housing, an elongated diaphragm casing carried within the housing, a diaphragm in said diaphragm casing, a spring member disposed substantially in parallel relation with said diaphragm, means connecting said diaphragm with said spring member for exing the latter in a direction transverse to the major axis oi the elongated diaphragm casing by movementI of the diaphragm, means for permitting the shifting of the spring member parallel to the maior axis of the elongated diaphragm casing and for securing the spring member at one end in its shifted position, a pointer arm, and a nexible connection between the free end of said spring member and the arm.

l2. In a pressure gauge, a housing, a pointer pivoted in said housing, a diaphragm casing mounted in said housing; a diaphragm in said casing, an .adjusting spring flxedly mounted at one of its ends in said housing, an elongated member including a calibrating spring ilxedly secured to said adJusting spring, said elongated member being connectedwith said diaphragm and with said pointer whereby movement o! said diaphragm ilexes said calibratlng spring to pivot said pointer, and means for flexing said adjusting spring to adjust the position of said pointer. i3. In a pressure gauge, a housing, a pointer pivoted in said housing, a diaphragm casing mounted in said housing, a diaphragm insaidl casing, a spring xedly mounted at one of its ends in said housing, an elongated member lixedly carried by said spring, and connected at spaced points thereof with said diaphragm and said pointer, movement of said diaphragm shifting said elongated member to actuate said pointer, and means for exing said spring to adjust the position of said pointer.

14.' In a pressure gauge, in combination, a shiftable pointer, a diaphragm casing mounting a diaphragm, an adjusting spring secured in fixed relation to said casing at one of its ends, an elongated member including a calibrating spring xedly secured to the free end of said adjusting spring, said elongated member being connected at spaced points thereof with said diaphragm and pointer whereby movement of the diaphragm flexes the calibrating spring to pivot said pointer, and means for ilexing said adjusting spring to adjust the position ot said pointer.

15. In a pressure gauge, a housing, a diaphragm casing carried within the housing, a

diaphragm in said diaphragm casing, a spring member disposed substantially in parallel relation with said diaphragm, means connecting said diaphragm with said spring member intermediate its ends for ilexing the latter by movement of the diaphragm, and means within the housing for mounting one end of said spring member, said spring mounting means being adjustable longitudinally of said spring to vary the position thereof relative to said connecting means and an indicator actuated by the free end of the spring.

16. In a pressure gauge, a housing, an eicngated diaphragm casing carried within the housing,a diaphragm in said diaphragm casing, a spring member disposed substantially in parallel relation to said diaphragm, means connecting said diaphragm with said spring member intermediate its ends for flexing the latter in a direction transverse to the major axis of the elongated diaphragm casing by movement of the diaphragm, and means within the housing for mounting one end of said spring member, said spring mounting means being shiftable parallel to the major axis of the elongated diaphragm casing to vary the position thereof relative to said connecting means and a pointer connected to the free end of said spring.

n PHILIP TRIP? SPRAGUE.

ARNOLD SOLLER.

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