Folded beam structure utilization methods and apparatus

• US 4,199,980 A
• Filed: 10/30/1978
• Issued: 04/29/1980
• Est. Priority Date: 10/30/1978
• Status: Expired due to Term

• Current Assignee: Imo Industries Incorporated (Enovis Corp.)
• Original Assignee: Bell & Howell LLC (Böwe Systec AG)
• Inventors: Bowman, Ronald
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US05/955,853
• Time in Patent Office: 547 Days
• Field of Search: 73/720, 73/721, 73/726, 73/727, 73/746, 73/777, 73/849, 73/141 A, 338/4, 338/5
• US Class Current: 73/862.382
• CPC Class Codes: G01L 1/2206 Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
• CPC Class Codes: G01L 1/26 Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload

Abstract

A force is translated into a pair of oppositely acting moments or electric signals up to a limited magnitude of that force by means of a folded beam structure which has a first leg presenting a first end of the folded beam structure, and a second leg, shorter than the first leg, presenting a second end of the beam structure. The first end is maintained relatively stationary and the force to be transduced is applied to the second end of the folded beam structure. The second leg is thereby moved with the applied force and there is thus applied on the first leg a first moment acting in a first portion of the first leg on one side of the second end and a second moment acting oppositely to the first moment in a second portion of the first leg on another side of the second end. According to the invention, overloading of the first leg is prevented by limiting the travel of the second leg against movement of that second leg by the applied force.

Claims

1. A method of translating a force into a pair of oppositely acting moments up to a limited magnitude of said force, comprising in combination the steps of:

providing a folded beam structure with a first leg presenting a first end of the folded beam structure, and a second leg shorter than said first leg and presenting a second end, spaced from said first end, of the folded beam structure;

maintaining said first end stationary relative to said second end of the folded beam structure;

applying said force to said second end of the folded beam structure, moving said second leg with said applied force and imposing on said first leg with said applied force and moving second leg a first moment acting in a first portion of said first leg on one side of said second end and a second moment acting oppositely to said first moment in a second portion of said first leg on another side of said second end; and

preventing overloading of said first leg by providing a stop member in the path of travel of said second leg and out of any path of travel of said first leg limiting the travel of said second leg by having said second leg impinge on said stop member in response to an overload condition in said applied force.

2. A method as claimed in claim 1, wherein:

said force is applied at said second end perpendicularly to said second leg.

3. A method as claimed in claim 1, wherein:

said force is applied at said second end perpendicularly to said second leg in a direction toward said first leg.

4. A method as claimed in claim 1, 2 or 3 wherein:

said travel of the second leg is limited at said second end to prevent overloading of said first leg.

5. A method as claimed in claim 1, wherein:

said first leg is made more flexible than said second leg.

6. A method as claimed in claim 5, wherein:

said force is applied at said second end perpendicularly to said second leg.

7. A method as claimed in claim 5, wherein:

said force is applied at said second end perpendicularly to said second leg in a direction toward said first leg.

8. A method as claimed in claim 5, 6 or 7 wherein:

said travel of the second leg is limited at said second end to prevent overloading of said first leg.

9. A method of translating a force into a pair of oppositely acting moments up to a limited magnitude of said force, comprising in combination the steps of:

providing a folded beam structure with a first leg presenting a first end of the folded beam structure, and a second leg shorter than said first leg and presenting a second end, spaced from said first end, of the folded beam structure;

said first leg being provided with a first width;

said second leg being provided with a second width wider than said first width;

maintaining said first end stationary relative to said second end of the folded beam structure;

applying said force to said second end of the folded beam structure, moving said second leg with said applied force and imposing on said first leg with said applied force and moving second leg a first moment acting in a first portion of said first leg on one side of said second end and a second moment acting oppositely to said first moment in a second portion of said first leg on another side of said second end; and

preventing overloading of said first leg by providing a stop with shoulder portions and with a groove extending between said shoulder portions, being wider than said first width, narrower than said second width and deeper than a travel of said first leg, permitting said first leg to extend in part through said groove with said first width located between said shoulder portions, and stopping the travel of said second leg with said shoulder portions against movement of said second leg by said applied force.

10. A method as claimed in claim 9, wherein:

said force is applied at said second end in a direction toward said first leg and perpendicularly to said second leg; and

said stop with shoulder portions is located at said second end for stopping the travel of said second leg at said second end.

11. In a method of transducing a force into electric signals, the improvement comprising in combination the steps of:

providing a folded beam structure with a flexible first leg presenting a first end of the folded beam structure and a second leg shorter than the first leg and presenting a second end, spaced from said first end, of the folded beam structure;

maintaining said first end stationary relative to said second end of the folded beam structure;

applying said force to said second end of the folded beam structure, moving said second leg with said applied force and imposing on said first leg with said applied force and moving second leg oppositely acting first and second stresses;

transducing said oppositely acting first and second stresses into electric signals indicative of said applied force; and

preventing overloading of said flexible first leg by providing a stop member in the path of travel of said second leg and out of any path of travel of said first leg limiting the travel of said second leg by having said second leg impinge on said stop member in response to an overload condition in said applied force.

12. A method as claimed in claim 11, wherein:

said force is applied at said second end perpendicularly to said second leg.

13. A method as claimed in claim 11, wherein:

said force is applied at said second end perpendicularly to said second leg in a direction toward said first leg.

14. A method as claimed in claim 11, 12 or 13, wherein:

said travel of the second leg is limited at said second end to prevent overloading of said first leg.

15. In a method of transducing a force into electric signals, the improvement comprising in combination the steps of:

providing a folded beam structure with a flexible first leg presenting a first end of the folded beam structure and a second leg shorter than the first leg and presenting a second end, spaced from said first end, of the folded beam structure;

said first leg being provided with a first width;

said second leg being provided with a second width wider than said first width;

maintaining said first end stationary relative to said second end of the folded beam structure;

applying said force to said second end of the folded beam structure;

moving said second leg with said applied force and imposing on said first leg with said applied force and moving second leg oppositely acting first and second stresses;

transducing said oppositely acting first and second stresses into electric signals indicative of said applied force; and

preventing overloading of said first leg by providing a stop with shoulder portions and with a groove extending between said shoulder portions, being wider than first width, narrower than said second width and deeper than a travel of said first leg, permitting said first leg to extend in part through said groove with said first width located between said shoulder portions, and stopping the travel of said second leg with said shoulder portions against movement of said second leg by said applied force.

16. A method as claimed in claim 15, wherein:

said force is applied at said second end in a direction toward said first leg and perpendicularly to said second leg; and

said stop with shoulder portions is located at said second end for stopping the travel of said second leg at said second end.

17. In a method of providing electric signals in response to deflection of a membrane, comprising in combination the steps of:

providing a folded beam structure with a flexible first leg presenting a first end of the folded beam structure and a second leg, shorter than the first leg, presenting a second end, spaced from the first end, of the folded beam structure;

maintaining said first end stationary relative to said second end of the folded beam structure;

transmitting said membrane deflection to said second end of the folded beam structure, deflecting said second leg with said transmitted membrane deflection and imposing on said first leg with said deflecting second leg oppositely acting first and second stresses;

transducing said oppositely acting first and second stresses into electric signals indicative of said membrane deflection; and

preventing overloading of said flexible first leg and membrane by providing a stop member in the path of travel of said second leg and out of any path of travel of said first leg limiting the travel of said deflecting second leg by having said second leg impinge on said stop member in response to an overload condition.

18. A method as claimed in claim 17, wherein:

said membrane deflection is transmitted to said second end along a straight line extending perpendicularly to said second leg.

19. A method as claimed in claim 17 or 18, wherein:

said travel of said deflecting second leg is limited at said second end of said folded beam structure.

20. In a method of providing electric signals in response to deflection of a membrane, comprising in combination the steps of:

providing a folded beam structure with a flexible first leg presenting a first end of the folded beam structure and a second leg, shorter than the first leg, presenting a second end, spaced from the first end, of the folded beam structure;

said first leg being provided with a first width;

said second leg being provided with a second width wider than said first width;

maintaining said first end stationary relative to said second end of the folded beam structure;

transmitting said membrane deflection to said second end of the folded beam structure, deflecting said second leg with said transmitted membrane deflection and imposing on said first leg with said deflecting second leg oppositely acting first and second stresses;

transducing said oppositely acting first and second stresses into electric signals indicative of said membrane deflection; and

preventing overloading of said flexible first leg and membrane by providing a stop with shoulder portions and with a groove extending between said shoulder portions, being wider than said first width, narrower than said second width and deeper than a travel of said first leg, permitting said first leg to extend in part through said groove with said first width located between said shoulder portions, and stopping the travel of said second leg with said shoulder portions against movement of said second leg by said applied force.

21. A method as claimed in claim 20, wherein:

said force is applied at said second end in a direction toward said first leg and perpendicularly to said second leg; and

said stop with shoulder portions is located at said second end for stopping the travel of said second leg at said second end.

22. Apparatus for translating a force into a pair of oppositely acting moments up to a limited magnitude of said force, comprising in combination:

a folded beam structure having a first leg providing a first end for the folded beam structure, and a second leg shorter than the first leg and providing a second end, spaced from said first end, for the folded beam structure;

means connected to said first end for maintaining the first end stationary relative to said second end;

means coupled to said second end for applying said force to the second end of the folded beam structure, for moving the second leg with said applied force and for imposing on the first leg with said applied force and moving second leg oppositely acting moments corresponding to said applied force; and

means for preventing overloading of said first leg, including means adjacent to, and in the path of travel of said second leg and out of any path of travel of said first leg for limiting the travel of the second leg against movement of the second leg by said applied force.

23. Apparatus as claimed in claim 22, wherein:

said force applying means include means for applying said force at said second end perpendicularly to said second leg.

24. Apparatus as claimed in claim 22, wherein:

said force applying means include means for applying said force at said second end perpendicularly to said second leg in a direction toward said first leg.

25. Apparatus as claimed in claim 22, 23 or 24, wherein:

said overload preventing means include means for limiting said travel of the second leg at said second end to prevent overloading of said first leg.

26. Apparatus as claimed in claim 22, wherein:

said first leg is more flexible than said second leg.

27. Apparatus as claimed in claim 26, wherein:

said force applying means include means for applying said force at said second end perpendicularly to said second leg.

28. Apparatus as claimed in claim 22, wherein:

said force applying means include means for applying said force at said second end perpendicularly to said second leg in a direction toward said first leg.

29. Apparatus as claimed in claim 26, 27 or 28, wherein:

said overload preventing means include means for limiting said travel of the second leg at said second end to prevent overloading of said first leg.

30. Apparatus for translating a force into a pair of oppositely acting moments up to a limited magnitude of said force, comprising in combination:

a folded beam structure having a first leg having a first width and providing a first end for the folded beam structure, and a second leg having a second width wider than said first width, being shorter than the first leg and providing a second end, spaced from said first end, for the folded beam structure;

means connected to said first end for maintaining the first end stationary relative to said second end;

means coupled to said second end for applying said force to the second end of the folded beam structure, for moving the second leg with said applied force and for imposing on the first leg with said applied force and moving second leg oppositely acting moments corresponding to said applied force; and

means for preventing overloading of said first leg having shoulder portions and a groove extending between said shoulder portions, being wider than said first width, narrower than said second width and deeper than the travel of said first leg, with said first leg extending in part through said groove with said first width located between said shoulder portions, and said shoulder portions being in the path of travel of said second leg, whereby said second leg is stopped by said shoulder portions.

31. Apparatus as claimed in claim 30, wherein:

said force applying means include means for applying said force at said second end in a direction toward said first leg and perpendicularly to said second leg; and

said means having shoulder portions are located at said second end in the path of travel of said second leg.

32. Apparatus as claimed in claim 30, wherein:

said first leg is more flexible than said second leg.

33. Apparatus as claimed in claim 32, wherein:

said force applying means include means for applying said force at said second end in a direction toward said first leg and perpendicularly to said second leg; and

said means having shoulder portions are located at said second end in the path of travel of said second leg.

34. In apparatus for transducing a force into electric signals, the improvement comprising in combination:

a folded beam structure having a flexible first leg providing a first end for the folded beam structure, and a second leg shorter than the first leg and providing a second end, spaced from said first end, for the folded beam structure;

means connected to said first end for maintaining said first end stationary relative to said second end of the folded beam structure;

means coupled to said second end for applying said force to said second end of the folded beam structure for moving said second leg with said applied force and for imposing on said first leg with said applied force and moving second leg oppositely acting first and second stresses;

means connected to said first leg for transducing said oppositely acting first and second stresses into electric signals indicative of said applied force; and

means for preventing overloading of said flexible first leg, including means adjacent to, and in the course of travel of said second leg, and out of the course of travel of said first leg, for limiting the travel of said second leg against movement of said second leg by said applied force.

35. Apparatus as claimed in claim 34, wherein:

said force applying means include means for applying said force at said second end perpendicularly to said second leg.

36. Apparatus as claimed in claim 34, wherein:

said force applying means include means for applying said force at said second end perpendicularly to said second leg in a direction toward said first leg.

37. Apparatus as claimed in claim 34, 35 or 36, wherein:

said overload preventing means include means for limiting said travel of the second leg at said second end to prevent overloading of said first leg.

38. In apparatus for transducing a force into electric signals, the improvement comprising in combination:

a folded beam structure having a flexible first leg having a first width and providing a first end for the folded beam structure, and a second leg having a second width wider than said first width, being shorter than the first leg and providing a second end, spaced from said first end, for the folded beam structure;

means connected to said first end for maintaining said first end stationary relative to said second end of the folded beam structure;

means coupled to said second end for applying said force to said second end of the folded beam structure for moving said second leg with said applied force and for imposing on said first leg with said applied force and moving second leg oppositely acting first and second stresses;

means connected to said first leg for transducing said oppositely acting first and second stresses into electric signals indicative of said applied force; and

means for preventing overloading of said flexible first leg having shoulder portions and a groove extending between said shoulder portions, being wider than said first width, narrower than said second width and deeper than the travel of said first leg, with said first leg extending in part through said groove with said first width located between said shoulder portions, and said shoulder portions being in the path of travel of said second leg, whereby said second leg is stopped by said shoulder portions.

39. Apparatus as claimed in claim 38, wherein:

said force applying means include means for applying said force at said second end in a direction toward said first leg and perpendicularly to said second leg; and

said means having shoulder portions are located at said second end in the path of travel of said second leg.

40. In apparatus for providing electric signals in response to deflection of a membrane, the improvement comprising in combination:

a folded beam structure having a flexible first leg providing a first end for the folded beam structure, and a second leg shorter than the first leg and providing a second end, spaced from the first end, for the folded beam structure;

means connected to said first end for maintaining said first end stationary relative to said second end of the folded beam structure;

means coupled to said membrane and said second end for transmitting said membrane deflection to said second end of the folded beam structure, for deflecting said second leg with said transmitted membrane deflection and for imposing on said first leg with said deflecting second leg oppositely acting first and second stresses;

means connected to said first leg for transducing said oppositely acting first and second stresses into electric signals indicative of said membrane deflection; and

means for preventing overloading of said flexible first leg and membrane, including means adjacent to, and in the course of travel of said second leg, and out of the course of travel of said first leg, for limiting the travel of said deflecting second leg.

41. Apparatus as claimed in claim 40, wherein:

said transmitting means include means coupled to said membrane and to said second end for transmitting said membrane deflection along a straight line extending perpendicularly to said second leg.

42. Apparatus as claimed in claim 40 or 41, wherein:

said overload preventing means include means for limiting said travel of said deflecting second leg at said second end of said folded beam structure.

43. In apparatus for providing electric signals in response to deflection of a membrane, the improvement comprising in combination:

a folded beam structure having a flexible first leg having a first width and providing a first end for the folded beam structure, and a second leg having a second width wider than said first width, being shorter than the first leg and providing a second end, spaced from the first end, for the folded beam structure;

means connected to said first end for maintaining said first end stationary relative to said second end of the folded beam structure;

means coupled to said membrane and said second end for transmitting said membrane deflection to said second end of the folded beam structure, for deflecting said second leg with said transmitted membrane deflection and for imposing on said first leg with said deflecting second leg oppositely acting first and second stresses;

means connected to said first leg for transducing said oppositely acting first and second stresses into electric signals indicative of said membrane deflection; and

means for preventing overloading of said flexible first leg and membrane having shoulder portions and a groove extending between said shoulder portions, being wider than said first width, narrower than said second width and deeper than the travel of said first leg, with said first leg extending in part through said groove with said first width located between said shoulder portions, and said shoulder portions being in the path of travel of said second leg, whereby said second leg is stopped by said shoulder.

44. Apparatus as claimed in claim 43, wherein:

said means having shoulder portions are located at said second end in the path of travel of said second leg.