US1224897A - Oven-thermometer. - Google Patents

Oven-thermometer. Download PDF

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US1224897A
US1224897A US7908716A US7908716A US1224897A US 1224897 A US1224897 A US 1224897A US 7908716 A US7908716 A US 7908716A US 7908716 A US7908716 A US 7908716A US 1224897 A US1224897 A US 1224897A
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case
spring
dial
casing
thermometer
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US7908716A
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Charles D Bolin
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K5/00Measuring temperature based on the expansion or contraction of a material
    • G01K5/48Measuring temperature based on the expansion or contraction of a material the material being a solid
    • G01K5/56Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid
    • G01K5/62Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid the solid body being formed of compounded strips or plates, e.g. bimetallic strip

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  • thermometers of the type shown in my application for patent filed July 6, 1915, Serial No. 38,080, wherein a bi-metallic spring forms the heat sensitive element.
  • the invention relates particularly to the construction and arrangement of the thermometer case, spring and indicating mechanism for responding quickly to the changes in temperature and for protecting the parts from injury and abuse.
  • the object ofthe invention is to reduce the number of parts, and to cheapen the cost of manufacture, of such thermometers by simplifying the construction of the case and the assembling therein of the operating parts. Further details of the inventionappear in the following description of the oven thermometer illustrated in the accompanying drawings, and what the invention consists in is more particularly defined in the appended claims.
  • Figure 1 is a front view of an oven ther mometer made in accordance with this invention, the front cover being partly broken away;
  • Fig. 2 is'a front view of the same with the front glass and its retainer removed, the front of the case partly broken away, and the index pointer broken ofl to show the parts within the inner chamber of the case;
  • Fig. 3 is a vertical cross-section of the same on the line 3-3 in Fig. 1;
  • Fig. 4 is a perspectiveview of a portion of the case.
  • Fig. 5 is a perspective view of the back assembledwith the heat sensitive spring and index-pointer pivot, ready for pressing into the case.
  • the improved device comprises a shallow cup shape cylindrical casing 11, arranged with its open side at the back and having an opening 12 through its edge at the front for the index pointer. This opening extends laterally around the periphery of the case as shown in Fig. i to permit the index pointer to be inserted through it.
  • the open side of the casing 11 is closed by a cup shape back 13 which forms a support for the heat sensitive spring and indicating mechanism.
  • the casing 11 has a back flange projecting out around its edge with two diametrically opposed ears or lugs 14 provided with holes 15 through which may be passed bolts or screws for securing the device to the door of an oven.
  • the front face of the casing 11 pro ects through the oven door, and a face or dial 16 is enameled directly upon it.
  • a glass 17 Over the dial is a glass 17, held by an outer casing ring'18 which surrounds the casing 11 and which has'an inturned lip or flange inclosing the glass.
  • Within the casing ring 18 between the glass and the dial holds'the glass spaced away from the dial and in contact with the flange, as shown in Fig. 3.
  • the separator ring is concave in cross-section, and itslower edge conceals the irregular edge of the dial.
  • the heat sensitive spring 20 is flat, and is riveted at one end to the edge of a post 23 which is secured to the back member 18 of the casing.
  • the other end of the spring 20 carries a finger or pin 24 which is fixedly secured to the spring on one side and which projects outwardly beyond the edge of the spring toward the dial to engage the slot in the arm 25 on the inner end of the index pointer.
  • the heat sensitive spring is composed of two leaves 21, 22, secured together flatwise,
  • a separator ring 19v these leaves being made of metals having diflerent coefficients of expansion, such as nickel, steel and brass. The effect of changes in temperature is to bend or how the spring sidewise, thereby causing the pin to swing the slotted arm 25 and deflect the index pointer.
  • the dial 16 is marked with a scale 27 reading from about 100 to about 500 degrees Fahrenheit, and the index pointer has a hand 26 which is arranged to swing in front of the dial over said scale.
  • the index pointer is pivoted on the outer end of a pivot post 28 which is riveted at the inner end to the back member 13 of the thermometer case.
  • the pivoted end of the index pointer has a strap portion 29 which lies alongside of the post and extends through the case, forming an integral connection between the hand 26 and the inner slotted arm 25.
  • the hand 26, connecting portion 29 and inner slotted arm 25 of the index pointer are all made in one piece by stamping them from sheet metal, and are then bent into the form shown in Fig. 8.
  • the spring 20 and pivot post 28 are assembled in the back member 13 of the casing and are securely riveted thereto, and the back memberis pressed into place in the thermometercasing.
  • the pivot post projects through the opening 12 in the front of the casing and the index pointer is slipped over it from the front side, the hand pointing away from the thermometer so that the arm 25 passes through the opening 12.
  • the hand is then turned around until it is over the scale on the dial, thereby swinging the arm through the slot 12 into the casing over the spring and causing the slot in the arm 25 to line up with the pin 24 on the spring.
  • the index pointer is then dropped into place on the pivot pin and the end of the pivot pin is spun or riveted over to secure the parts in position.
  • the connecting portion 29 of the index pointer can be twisted slightly when the parts are assembled in order to adjust the relative position of the hand and inner arm to correspond to any slight irregularities in the setting and shape of the spring. By this means the hand can be adjusted to stand at the proper point on the scale for the particular temperature at which the instrument is adjusted.
  • the index pointer is the only moving part, and this can be made of very light metal so as to be quickly responsive to the tendency of the spring to bend with changes in temperature.
  • thermometer comprising a case, having a solid front wall and an open side at the back, a dial on the front wall of said case, a back closing the open side of said case and fixed thereto, "a heat sensitive spring and a pivot post secured to said back,
  • said pivot post projecting through the front wall of said case, a pointer rotatable on the end of said pivot post, said pointer having an arm within said case pivoted on said post and adapted for cooperation with said spring.
  • thermometer comprising a cupped case inclosing a heat sensitive spring, the front wall of said case having an enamel dial thereon, a retainer ringsu-rrounding said case, said retainer ring having an inturned flange for holding a glass, a separator ring between the glass and the front wall of the case, said separator ring being convex whereby its inner edge covers the edge portion of the dial, and an index pointer moved by said spring, said pointer being disposed between said glass and dial.
  • thermometer comprising a cupped case having a front wall with a hole in it, a dial on the front wall of said case, a back closing the open side of said case and fixed thereto, said back being of thinner metal than said case, a heat sensitive spring and a pivot post within said case, said pivot post having its front end in alinement with said hole through the front face of said case, and a one-piece index pointer journaled thereon, and projecting through said hole.
  • a casing for a thermometer comprising a shallow cup having a front wall and an open side, the front wall of said cup having a dial made thereon, a back wall secured to said cup andclosing its open side, said cup having an opening in its front and peripheral walls for the insertion of an index pointer, and an outer ring closing the opening in the peripheral wall of said cup.
  • thermometer comprising a cupped case having an open side, a dial on the front wall of said case, a back closing the open side of said case and fixedto said case, a heat sensitive spring and a pivot post arranged in the case, a pointer'rotatableon the end of said pivot post, said pointer having an arm within said case pivoted on said post and adapted .for cooperation with said spring, said case having an opening in its front wall for said index pointer, said opening having a lateral extension in the peripheral Wall of the case ing the front Wall of said casing and having for said arm, and a ring covering said exan opening for an index pointer, said bottension. tom having an enamel dial fused on its 1:) a 6.
  • a metal thermometer casing comprisouter side. 5 ing a shallow cup shape front portion hav- Signed at St. Louis, Missouri, this 14th ing integral side walls and bottom, the day of February, 1916. bottom of said cup shape portion constitut- CHARLES D. BOLIN.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Description

C. D. BOLIN.
OVEN THERMOMETER.
APPLICATION FILED FEB. I8, 1916.
Patented May 8, 1917.
Zflziizeraew 4% I CHARLES D. IBOLIN, OF ST. LOUIS, MISSOURI- v ovnn-rnnmvroiunrnn.
Specification of Letters Patent.
. Patented May 8, 1917.
Application filed February 18, 1916. 1 Serial No. 79,087.
To all whom it may concern: Be it known that I, GrrAnLns D. BoLIN,
a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Oven-Thermometers, of which the following is a specification.
This invention is an improvement in thermometers of the type shown in my application for patent filed July 6, 1915, Serial No. 38,080, wherein a bi-metallic spring forms the heat sensitive element. The invention relates particularly to the construction and arrangement of the thermometer case, spring and indicating mechanism for responding quickly to the changes in temperature and for protecting the parts from injury and abuse.
The object ofthe invention is to reduce the number of parts, and to cheapen the cost of manufacture, of such thermometers by simplifying the construction of the case and the assembling therein of the operating parts. Further details of the inventionappear in the following description of the oven thermometer illustrated in the accompanying drawings, and what the invention consists in is more particularly defined in the appended claims.
In the drawings, in which like parts are designated by the same reference characters in the several views.
Figure 1 is a front view of an oven ther mometer made in accordance with this invention, the front cover being partly broken away;
Fig. 2 is'a front view of the same with the front glass and its retainer removed, the front of the case partly broken away, and the index pointer broken ofl to show the parts within the inner chamber of the case;
Fig. 3 is a vertical cross-section of the same on the line 3-3 in Fig. 1;
Fig. 4 is a perspectiveview of a portion of the case; and
Fig. 5 is a perspective view of the back assembledwith the heat sensitive spring and index-pointer pivot, ready for pressing into the case.
Referring to the drawings, the improved device comprises a shallow cup shape cylindrical casing 11, arranged with its open side at the back and having an opening 12 through its edge at the front for the index pointer. This opening extends laterally around the periphery of the case as shown in Fig. i to permit the index pointer to be inserted through it. The open side of the casing 11 is closed by a cup shape back 13 which forms a support for the heat sensitive spring and indicating mechanism. The casing 11 has a back flange projecting out around its edge with two diametrically opposed ears or lugs 14 provided with holes 15 through which may be passed bolts or screws for securing the device to the door of an oven. The front face of the casing 11 pro ects through the oven door, and a face or dial 16 is enameled directly upon it. Over the dial is a glass 17, held by an outer casing ring'18 which surrounds the casing 11 and which has'an inturned lip or flange inclosing the glass. within the casing ring 18 between the glass and the dial holds'the glass spaced away from the dial and in contact with the flange, as shown in Fig. 3. The separator ring is concave in cross-section, and itslower edge conceals the irregular edge of the dial.
The heat sensitive spring 20 is flat, and is riveted at one end to the edge of a post 23 which is secured to the back member 18 of the casing. The other end of the spring 20 carries a finger or pin 24 which is fixedly secured to the spring on one side and which projects outwardly beyond the edge of the spring toward the dial to engage the slot in the arm 25 on the inner end of the index pointer.
The heat sensitive spring is composed of two leaves 21, 22, secured together flatwise,
A separator ring 19v these leaves being made of metals having diflerent coefficients of expansion, such as nickel, steel and brass. The effect of changes in temperature is to bend or how the spring sidewise, thereby causing the pin to swing the slotted arm 25 and deflect the index pointer. a
The dial 16 is marked with a scale 27 reading from about 100 to about 500 degrees Fahrenheit, and the index pointer has a hand 26 which is arranged to swing in front of the dial over said scale. The index pointer is pivoted on the outer end of a pivot post 28 which is riveted at the inner end to the back member 13 of the thermometer case. The pivoted end of the index pointer has a strap portion 29 which lies alongside of the post and extends through the case, forming an integral connection between the hand 26 and the inner slotted arm 25. The hand 26, connecting portion 29 and inner slotted arm 25 of the index pointer are all made in one piece by stamping them from sheet metal, and are then bent into the form shown in Fig. 8. In order to assemble the device the spring 20 and pivot post 28 are assembled in the back member 13 of the casing and are securely riveted thereto, and the back memberis pressed into place in the thermometercasing. The pivot post projects through the opening 12 in the front of the casing and the index pointer is slipped over it from the front side, the hand pointing away from the thermometer so that the arm 25 passes through the opening 12. The hand is then turned around until it is over the scale on the dial, thereby swinging the arm through the slot 12 into the casing over the spring and causing the slot in the arm 25 to line up with the pin 24 on the spring. The index pointer is then dropped into place on the pivot pin and the end of the pivot pin is spun or riveted over to secure the parts in position. The connecting portion 29 of the index pointer can be twisted slightly when the parts are assembled in order to adjust the relative position of the hand and inner arm to correspond to any slight irregularities in the setting and shape of the spring. By this means the hand can be adjusted to stand at the proper point on the scale for the particular temperature at which the instrument is adjusted.
I It is evident that a device made as above described has comparatively few parts, which parts are simple in construction and easy to assemble. The heat sensitive spring is straight at ordinary room temperature, and consequently requires no bending or other adjustment, the relative positions of the slotted arm and point-er being adjustable to suit' small variations in the setting of the spring. There are only two moving parts, which reduces the lost motion and backlash of the connections and pivots to a minimum, and hence increases the accuracy and life of the instrument. The back is supported and protected by the case, and is made very thin so as to readily transmit heat from the oven. to the interior of the casing. Furthermore, the casing being com pletely closed the parts cannot be tampered with and are protected from injury. Also, no dirt, grease or smoke from the oven can get into the casing to gum up or corrode the moving parts, and therefore the device will not become sluggish or inaccurate in the course of a comparatively short time. Excepting the spring the index pointer is the only moving part, and this can be made of very light metal so as to be quickly responsive to the tendency of the spring to bend with changes in temperature.
The invention is not limited to the precise forms and arrangement of the parts shown and described.
I claim the following as my invention:
1. A thermometer comprising a case, having a solid front wall and an open side at the back, a dial on the front wall of said case, a back closing the open side of said case and fixed thereto, "a heat sensitive spring and a pivot post secured to said back,
said pivot post projecting through the front wall of said case, a pointer rotatable on the end of said pivot post, said pointer having an arm within said case pivoted on said post and adapted for cooperation with said spring.
2. A thermometer comprising a cupped case inclosing a heat sensitive spring, the front wall of said case having an enamel dial thereon, a retainer ringsu-rrounding said case, said retainer ring having an inturned flange for holding a glass, a separator ring between the glass and the front wall of the case, said separator ring being convex whereby its inner edge covers the edge portion of the dial, and an index pointer moved by said spring, said pointer being disposed between said glass and dial.
3. A thermometer comprising a cupped case having a front wall with a hole in it, a dial on the front wall of said case, a back closing the open side of said case and fixed thereto, said back being of thinner metal than said case, a heat sensitive spring and a pivot post within said case, said pivot post having its front end in alinement with said hole through the front face of said case, and a one-piece index pointer journaled thereon, and projecting through said hole.
t. A casing for a thermometer comprising a shallow cup having a front wall and an open side, the front wall of said cup having a dial made thereon, a back wall secured to said cup andclosing its open side, said cup having an opening in its front and peripheral walls for the insertion of an index pointer, and an outer ring closing the opening in the peripheral wall of said cup.
5. A thermometer comprising a cupped case having an open side, a dial on the front wall of said case, a back closing the open side of said case and fixedto said case, a heat sensitive spring and a pivot post arranged in the case, a pointer'rotatableon the end of said pivot post, said pointer having an arm within said case pivoted on said post and adapted .for cooperation with said spring, said case having an opening in its front wall for said index pointer, said opening having a lateral extension in the peripheral Wall of the case ing the front Wall of said casing and having for said arm, and a ring covering said exan opening for an index pointer, said bottension. tom having an enamel dial fused on its 1:) a 6. A metal thermometer casing comprisouter side. 5 ing a shallow cup shape front portion hav- Signed at St. Louis, Missouri, this 14th ing integral side walls and bottom, the day of February, 1916. bottom of said cup shape portion constitut- CHARLES D. BOLIN.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of I'atents, Washington, D. C.
US7908716A 1916-02-18 1916-02-18 Oven-thermometer. Expired - Lifetime US1224897A (en)

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