US3850257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for prevention of errors in scale measurement due to temperature variations
Assignee: Individual
•
Filing: 1973-11-07
•
Granted: 1974-11-26
•
Expires: 1993-11-07
Abstract
Abstract An improved seal designed and dimensioned such that changes in dimensions due to temperature variations balance out such that the indicator is insensitive to temperature variations.
Inventors
- 👤 T Teraoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:38
CPC Classifications
G; G01; G01G; G01G3/00; G01G3/02; G01G3/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
400 words
In a scale having parts with linear dimensions and coefficients of expansion comprising a frame having a top with guide means; a weighing table having a supporting arm; slidably mounted for up and down movement through said guide means; a lever pivoted at its one end and pivotably connected intermediate its length to the said arm; at least one spring having a linear coefficient of expansion (g) and a length (G) from one end to an opposite second end, said one end of said spring being connected to said lever between said arm and the other end of the lever opposite to the pivoted end of said lever; a support mounted on the frame for suspending the spring, said support having an upright member of length (E) and a linear coefficient of expansion (e) and a top supported on said upright member having a spring arm connected to said spring at the end extending away from said lever of length (F) and a linear coefficient of expansion (f); a code plate having graduations thereon at spaced intervals including an intermediate zero graduation, having a linear coefficient of expansion (c), one end of the code plate being fastened to the end of said lever opposite to the pivoted end of the lever and having a length (C) located between the end of the code plate fastened to the lever and the zero graduation on the code plate; a reading member mounted on the frame and alignable with the code plate for reading the graduations thereon, the reading member having a linear coefficient of expansion (d) and a vertical height (D) extending from part of the frame at which the reading member is mounted to the zero point of alignment of the reading member with the code plate, the lever having a linear coefficient of expansion (h) and vertical distance (H) being the height measured between the end of the lever to which the code plate is fastened and the point at which the other end of the lever is pivoted, the improvement wherein said parts of the scale have the linear dimensions and coefficients of expansion defined according to the relation E.e D.d + F.f + G.g - H.h - C.c, whereby errors in weighing are eliminated due to variation of the zero position alignment of the code plate with the reading member of the scale due to changes in temperature.
Claim 2
Dependent Claim
400 words
In a scale having parts with linear dimensions and coefficients of expansion comprising a frame having a top with guide means; a weighing table having a supporting arm; slidably mounted for up and down movement through said guide means; a lever pivoted at its one end and pivotably connected intermediate its length to the said arm; at least one spring having a linear coefficient of expansion (g) and a length (G) from one end to an opposite second end, said one end of said spring being connected to said lever between said arm and the other end of the lever opposite to the pivoted end of said lever; a support mounted on the frame for suspending the spring, said support having an upright member of length (E) and a linear coefficient of expansion (e) and a top supported on said upright member having a spring arm connected to said spring at the end extending away from said lever of length (F) and a linear coefficient of expansion (f); a code plate having graduations thereon at spaced intervals including an intermediate zero graduation, having a linear coefficient of expansion (c), one end of the code plate being fastened to the end of said lever opposite to the pivoted end of the lever and having a length (C) located between the end of the code plate fastened to the lever and the zero graduation on the code plate; a reading member mounted on the frame and alignable with the code plate for reading the graduations thereon, the reading member having a linear coefficient of expansion (d) and a vertical height (D) extending from part of the frame at which the reading member is mounted to the zero point of alignment of the reading member with the code plate, the lever having a linear coefficient of expansion (h) and vertical distance (H) being the height measured between the end of the lever to which the code plate is fastened and the point at which the other end of the lever is pivoted, the improvement wherein said parts of the scale have the linear dimensions and coefficients of expansion defined according to the relation E.e D.d + F.f + G.g - H.h - C.c, whereby errors in weighing are eliminated due to variation of the zero position alignment of the code plate with the reading member of the scale due to changes in temperature.
Claim 3
Dependent Claim
68 words
The improved scale according to claim 1, wherein said support mounted on the frame for suspending the spring comprises an upright member including at least two parts having linear coefficients of expansion, e1, e2, en and lengths E1, E2...En, the relationship between linear dimensions and coefficients of expansion of the scale being E1.e1+ E2.e2+... En.en D.d + F.f+ G.g-H.h- C.c where n is a positive integer not zero.
Claim 4
Dependent Claim
11 words
The improved scale according to claim 2, where n is 2.
Claim 5
Dependent Claim
32 words
The improved scale according to claim 2, wherein n is 2 and e1 is the linear coefficient of expansion of Invar steel, while e2 is the linear coefficient of expansion of iron.
Claim 6
Dependent Claim
52 words
The improved scale accordinG to claim 1, wherein two springs are connected to the lever and suspended from the support, the linear coefficient of expansion of one spring being substantially zero, and the linear coefficient of expansion of the other spring being g, the term G.g referring only to said other spring.
Claim 7
Dependent Claim
108 words
The improved scale according to claim 5, wherein one spring (E) is of a different material from the other spring (P) and each spring is suspended from a spring connected to the support, where the efficient winding number of the one spring, E, is determined by the relationship KE/KP nP/nE . R where R DP3/DE3 dE4/dp4 where dE and dp designates the linear diameters of each spring, DE and DP the winding diameter of each spring, and where KE and KP designate each of the proportionality constants of the springs, whereby errors in the indicated weight on the scale of an object due to temperature variations are eliminated.
Claim 8
Dependent Claim
22 words
A scale as described in claim 6, wherein one spring is composed of Invar steel and the other composed of carbonate steel.
Claim 9
Dependent Claim
24 words
A scale as described in claim 6, wherein one spring is composed of Elcoloy metal and the other spring is composed of piano wire.
Claim 10
Dependent Claim
22 words
A scale as described in claim 6, wherein one spring is composed of Invar steel and the other is some other material.
Claim 11
Dependent Claim
294 words
In a scale having parts with linear dimensions and coefficients of expansion comprising a frame having a top with guide means; a weighing table having a supporting arm; slidably mounted for up and down movement through said guide means; a lever pivoted at its one end and pivotally connected intermediate its length to the said arm; a first spring and a second spring each having one end connected to said lever between said arm and the other end of the lever opposite to the pivoted end of said lever; a support mounted on the frame for suspending the said first and second springs, said support having an upright member and a top supported on said upright member having a spring arm connected to each of said springs at the end extending away from said lever; a code plate having graduations thereon at spaced intervals including an intermediate zero graduation, one end of the code plate being fastened to the end of said lever opposite to the pivoted end of the lever; a reading member mounted on the frame and alignable with the code plate for reading the graduations thereon, the improvement wherein the first spring (E) is of a different material from the second spring (P) and each spring is suspended from a spring connected to the support, where the efficient winding number of the first spring E is determined by the relationship KE/KP nP/nE . R where R DP3 dE4/DE3 dP4 where dE and dp designate the linear diameters of each spring, DE and DP the winding diameter of each spring, and where KE and KP designate each of the proportionality constants of the springs, whereby errors in the indicated weight on the scale of an object due to temperature variations are eliminateed.
Claim 12
Dependent Claim
294 words
In a scale having parts with linear dimensions and coefficients of expansion comprising a frame having a top with guide means; a weighing table having a supporting arm; slidably mounted for up and down movement through said guide means; a lever pivoted at its one end and pivotally connected intermediate its length to the said arm; a first spring and a second spring each having one end connected to said lever between said arm and the other end of the lever opposite to the pivoted end of said lever; a support mounted on the frame for suspending the said first and second springs, said support having an upright member and a top supported on said upright member having a spring arm connected to each of said springs at the end extending away from said lever; a code plate having graduations thereon at spaced intervals including an intermediate zero graduation, one end of the code plate being fastened to the end of said lever opposite to the pivoted end of the lever; a reading member mounted on the frame and alignable with the code plate for reading the graduations thereon, the improvement wherein the first spring (E) is of a different material from the second spring (P) and each spring is suspended from a spring connected to the support, where the efficient winding number of the first spring E is determined by the relationship KE/KP nP/nE . R where R DP3 dE4/DE3 dP4 where dE and dp designate the linear diameters of each spring, DE and DP the winding diameter of each spring, and where KE and KP designate each of the proportionality constants of the springs, whereby errors in the indicated weight on the scale of an object due to temperature variations are eliminateed.
Claim 13
Dependent Claim
24 words
A scale as claimed in claim 10, wherein one spring is composed of Invar steel and the other spring is composed of carbonate steel.
Claim 14
Dependent Claim
24 words
A scale as claimed in claim 10, wherein one spring is composed of Elcoloy metal and the other spring is composed of piano wire.
Claim 15
Dependent Claim
24 words
A scale as claimed in claim 10, wherein one spring is composed of Invar steel and the other spring is composed of another material.
References Cited (Backward Citations)
US1255351A
Cited
US1890569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |