Flexible mount for coupling force actuator to caliper jaw

• US 9,267,779 B2
• Filed: 03/31/2014
• Issued: 02/23/2016
• Est. Priority Date: 03/31/2014
• Status: Active Grant

• Current Assignee: Mitutoyo Corporation
• Original Assignee: Mitutoyo Corporation
• Inventors: Emtman, Casey E., Goldsworthy, Michael Edward, Garrity, William Randall
• Primary Examiner(s): Martin, Laura
• Assistant Examiner(s): Lange, Rhyan C
• Application Number:
  US14/231,492
• Publication Number:
  US 20150276366A1
• Time in Patent Office: 694 Days
• Field of Search: 337/01, 335/421, 337/83, 337/84, 338/10, 338/11, 338/08, 338/15
• US Class Current: 1/1
• CPC Class Codes: G01B 3/008 Arrangements for controlling the measuring force
• CPC Class Codes: G01B 3/18 Micrometers
• CPC Class Codes: G01B 3/20 Slide gauges
• CPC Class Codes: G01B 3/205 provided with a counter for digital indication of the measured dimension
• CPC Class Codes: G01B 3/22 Feeler-pin gauges, e.g. dial gauges for measuring contours or curvatures G01B5/20
• CPC Class Codes: G01B 5/00 Measuring arrangements characterised by the use of mechanical techniques
• CPC Class Codes: G01B 5/02 for measuring length, width or thickness G01B5/004, G01B5/08 take precedence
• CPC Class Codes: G01B 5/08 for measuring diameters G01B5/0035 takes precedence; measuring radius of curvature G01B5/213
• CPC Class Codes: G01B 5/12 internal diameters
• CPC Class Codes: G01B 5/14 for measuring distance or clearance between spaced objects or spaced apertures G01B5/24 takes precedence
• CPC Class Codes: G01D 5/12 using electric or magnetic means G01D5/06 takes precedence

Abstract

A flexible mount is provided for coupling a force actuator to a caliper jaw. The flexible mount includes a first mounting portion for being coupled to the caliper jaw, a second mounting portion for being coupled to the force actuator, and a flexible element (e.g., a parallel flexure) coupled between the first and second mounting portions. When a force is applied to the force actuator (e.g., by a user pushing on a thumbwheel) along the measuring axis direction, the flexible element flexes to generate a measuring force that is applied to the caliper jaw. The use of the flexible mount results in more control and a better feel for a user when attempting to exert control to provide a desired amount of force during a measuring process. The flexible mount may also utilize a fastening configuration that is compatible with existing mounting features on existing caliper jaws.

Claims

1. A flexible mount for coupling a force actuator to a caliper jaw that moves along a caliper scale member along a measuring axis direction in a caliper, the flexible mount comprising:

a first mounting portion for being coupled to the caliper jaw;

a second mounting portion for being coupled to the force actuator; and

a flexible element coupled between the first and second mounting portions,

wherein the flexible mount is configured such that when it is coupled to the caliper jaw and the force actuator;

the force actuator is suspended to move with the caliper jaw along the caliper scale member and is restrained from displacement relative to the caliper jaw along directions transverse to the measuring axis direction; and

when a force is applied to the force actuator along the measuring axis direction, the flexible element flexes such that the force actuator displaces along the measuring axis direction relative to the caliper jaw, and generates a measuring force that depends on that relative displacement and is applied to the caliper jaw along the measuring axis direction; and

wherein the flexible mount is included with a set of interchangeable flexible mounts, wherein each flexible mount in the set provides a different spring rate.

2. The flexible mount of claim 1, wherein the flexible element comprises parallel spring elements that bend primarily in a plane parallel to the measuring axis direction.

3. The flexible mount of claim 1, wherein:

the flexible element is configured for bi-directional elastic coupling of the force actuator to the caliper jaw, such that force applied to the force actuator in a first direction along the measuring axis direction generates a first polarity deformation of the flexible element which generates a first polarity measuring force applied to the caliper jaw, and force applied to the force actuator in a second direction along the measuring axis direction generates a second polarity deformation of the flexible element which generates a second polarity measuring force applied to the caliper jaw.

4. The flexible mount of claim 1, further comprising a displacement indicator that is responsive to a deformation comprising at least one of the flexing of the flexible element and the relative displacement of the force actuator.

5. The flexible mount of claim 4, wherein the response of the displacement indicator is indicative of the measuring force.

6. The flexible mount of claim 4, wherein the displacement indicator comprises at least one of a visual indicator responsive to the deformation, a tactile sensation generator that provides at least one respective tactile sensation corresponding to the deformation, and a sound generator that provides at least one respective sound corresponding to the deformation.

7. A flexible mount for coupling a force actuator to a caliper jaw that moves along a caliper scale member along a measuring axis direction in a caliper, the flexible mount comprising:

a first mounting portion for being coupled to the caliper jaw;

a second mounting portion for being coupled to the force actuator; and

a flexible element coupled between the first and second mounting portions,

wherein the flexible mount is configured such that when it is coupled to the caliper jaw and the force actuator;

the force actuator is suspended to move with the caliper jaw along the caliper scale member and is restrained from displacement relative to the caliper jaw along directions transverse to the measuring axis direction; and

when a force is applied to the force actuator along the measuring axis direction, the flexible element flexes such that the force actuator displaces along the measuring axis direction relative to the caliper jaw, and generates a measuring force that depends on that relative displacement and is applied to the caliper jaw along the measuring axis direction, and wherein the flexible mount is configured to mount the force actuator to the caliper jaw of existing calipers using a fastening configuration that is compatible with existing mounting features on the caliper jaw.

8. The flexible mount of claim 7, further comprising a stop arrangement configured to provide a maximum relative displacement limit between the force actuator and the caliper jaw along the measuring axis direction, such that deformation of the flexible element is limited to substantially exclude plastic deformation of the flexible element.

9. The flexible mount of claim 8, wherein the stop arrangement is configured to transmit additional force between the force actuator and the caliper jaw once the maximum relative displacement limit is reached.

10. The flexible mount of claim 7, wherein the flexible mount is configured such that a relative displacement of at least 0.5 mm and at most 5.0 mm corresponds to a related change in the measuring force of at least 0.1 newtons and at most 10 newtons.

11. The flexible mount of claim 7, wherein the existing calipers do not include a force actuator and the force actuator is retrofitted to the existing calipers using the flexible mount.

12. The flexible mount of claim 11, further comprising a displacement indicator that is responsive to a deformation comprising at least one of the flexing of the flexible element and the relative displacement of the force actuator.

13. The flexible mount of claim 12, wherein the displacement indicator comprises at least one of a visual indicator responsive to the deformation, a tactile sensation generator that provides at least one respective tactile sensation corresponding to the deformation, and a sound generator that provides at least one respective sound corresponding to the deformation.

14. The flexible mount of claim 7, wherein the flexible mount is included with a set of interchangeable flexible mounts, wherein each flexible mount in the set provides a different spring rate.

15. A method for retrofitting an existing caliper with a flexible mount, the existing caliper including a caliper jaw that moves along a caliper scale member along a measuring axis direction in the caliper, the method comprising:

providing a flexible mount comprising;

a first mounting portion for being coupled to the caliper jaw;

a second mounting portion for being coupled to a force actuator; and

a flexible element coupled between the first and second mounting portions, and

coupling the first mounting portion to the caliper jaw using a fastening configuration that is compatible with existing mounting features on the caliper jaw;

wherein the flexible mount is configured such that when it is coupled to the caliper jaw and the force actuator;

the force actuator is suspended to move with the caliper jaw along the caliper scale member and is restrained from displacement relative to the caliper jaw along directions transverse to the measuring axis direction; and

when a force is applied to the force actuator along the measuring axis direction, the flexible element flexes such that the force actuator displaces along the measuring axis direction relative to the caliper jaw, and generates a measuring force that depends on that relative displacement and is applied to the caliper jaw along the measuring axis direction, and

wherein the existing caliper does not include a force actuator and the force actuator is retrofitted to the existing caliper using the flexible mount.

16. The method of claim 15, further comprising providing a displacement indicator that is responsive to a deformation comprising at least one of the flexing of the flexible member and the relative displacement of the force actuator.

17. The method of claim 16, wherein the displacement indicator comprises at least one of a visual indicator responsive to the deformation, a tactile sensation generator that provides at least one respective tactile sensation corresponding to the deformation, and a sound generator that provides at least one respective sound corresponding to the deformation.

18. The method of claim 15, wherein the flexible element comprises parallel spring elements that bend primarily in a plane parallel to the measuring axis direction.

19. The method of claim 15, further comprising achieving a different spring rate for the force actuator relative displacement by de-coupling the flexible mount from the caliper jaw and coupling a different flexible mount with a different spring rate to the caliper jaw.