Cantilever beam scale

• US 8,436,261 B2
• Filed: 12/13/2004
• Issued: 05/07/2013
• Est. Priority Date: 12/13/2004
• Status: Active Grant

• Current Assignee: Nate John Coleman
• Original Assignee: Nate John Coleman
• Inventors: Coleman, Nate John
• Primary Examiner(s): Gibson, Randy W
• Application Number:
  US11/010,161
• Publication Number:
  US 20060124365A1
• Time in Patent Office: 3,067 Days
• Field of Search: 738/626.34, 738/626.39, 738/623.38, 738/623.4, 177/136, 177/144, 177199-200, 177/211, 177/229
• US Class Current: 177/136
• CPC Class Codes: G01G 3/12 wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
• CPC Class Codes: G01L 1/2206 Special supports with preselected places to mount the resistance strain gauges; Mounting of supports

Abstract

An improved device for the measuring of weight or force is disclosed. This is an apparatus that allows for measurement of weight or force using a cantilever beam that is substantially insensitive to location of the weight or force within certain limits on the beam and is capable of correction for off-level conditions.

Claims

1. An improved mobile or vehicle mounted device for measuring weight or force comprising:

a cantilever beam secured or affixed at one end to the vehicle or mobile platform, with an array of multiple gauges or sensors placed at known locations on or in said beam substantially near to a secured end, so as to detect a local tensile stress or strain and a local compressive stress or strain in the beam outboard of the sensors;

wherein the ratios of outputs from the array of multiple gauges or sensors can be used to determine weight or force applied anywhere along said beam;

where the local compressive stress and the local tensile stress are measured substantially simultaneously;

where the individual sensors are pressed into a receiver hole formed or cut into the cantilever beam;

where the receiver hole is formed around each sensor; and

where each receiver hole substantially forms a cylindrical shape around each sensor.

2. The device of claim 1, wherein the multiple gauges or sensors are placed at predetermined locations on the cantilever beam which applies mathematical ratioing formulae to calculate a weight or force using a ratio or subtraction of the outputs from the individual gauges or sensors placed in or on the cantilever beam.

3. The device of claim 1, wherein the multiple gauges or sensors are placed at predetermined locations on the cantilever beam which calculates the ratios of outputs from the individual gauges or sensors.

4. The device of claim 1, wherein the multiple gauges or sensors are placed at predetermined locations on the cantilever beam a difference in output between the tensile and compressive sides of the cantilever beam.

5. The device of claim 1 where the beam is straight or curved or another non-straight beam shape which uses the ratios or subtraction of the outputs of multiple sensors or gauges to resolve a weight or force of unknown location on the beam.

6. The device of claim 1 wherein the individual sensors comprise complete Wheatstone bridges mounted to a plate or membrane which is attached to the cantilever beam.

7. The device of claim 1 where the individual sensors are pressed into a receiver hole formed or cut into the cantilever beam.

8. A scale mounted on a mobile platform comprising:

(a) a cantilever beam secured or affixed at one end to a mobile platform;

(b) two gauges or sensors placed at known locations near said secured or affixed end of said cantilever beam, and positioned along the upper portion of said cantilever beam, said sensors being placed either internally to said cantilever beam or externally secured to said cantilever beam, said sensors or gauges being of a type to detect and measure a first local tensile stress and a second tensile stress or strain in said cantilever beam outboard of said sensors or gauges;

(c) two gauges or sensors placed along the lower portion of cantilever beam, corresponding in location as measured from the end of said cantilever beam to the locations of the sensors placed along the upper portion of said cantilever beam, said sensors likewise being placed either internally to said cantilever beam or externally secured to said cantilever beam, said sensors or gauges likewise being of a type to detect and measure a first local compressive stress and a second compressive stress or strain in said cantilever beam outboard of said sensors and gauges;

(d) an attachment capable of receiving a force or load to be measured, said attachment located outboard of the location of said gauges or sensors on the opposite end of said cantilever beam than the secured or affixed end;

(e) the individual output signals of said gauges or sensors and uses a mathematical formulae based on the ratio of the individual output signals to calculate the weight or force applied to said cantilever beam;

(f) where the local compressive stress and the local tensile stress are measured simultaneously; and

(g) where the individual sensors are pressed into a receiver hole formed or cut into the cantilever beam.

9. The scale in claim 8 wherein each gauge or sensor further comprises a Wheatstone bridge.

10. The scale in claim 8 wherein said cantilever beam is not straight.

11. A method, comprising:

securing a cantilever beam to a vehicle or mobile platform, the cantilever beam having an array of multiple gauges or sensors placed at known locations on or in said beam substantially near to a secured end of the cantilever beam, so as to detect a local tensile stress and a local compressive stress or strain in the beam outboard of the sensors;

where the individual sensors are pressed into a receiver hole formed or cut into the cantilever beam.

12. The method of claim 11, further comprising:

obtaining a ratio of compressive and tensile outputs from the gauges or sensors to determine weight or force applied anywhere along said beam.

13. The method of claim 11, further comprising:

determining weight or force on the beam using a ratio or subtraction of the outputs from the individual gauges or sensors placed in or on the cantilever beam.

14. The method of claim 11, further comprising:

mounting an at least one sensor to a plate or membrane which is attached to the beam.

15. The method of claim 11, further comprising:

(a) pressing an at least one sensor into a receiver hole formed or cut into a cantilever beam;

(b) where a receiver hole is formed around each Wheatstone bridge;

(c) where the width of the cantilever beam is not more than the diameter of the at least one sensor; and

(d) where each receiver hole substantially forms a cylindrical shape around each Wheatstone bridge.