Portable coordinate measurement machine with integrated magnetic mount

• US 20040006882A1
• Filed: 02/13/2003
• Published: 01/15/2004
• Est. Priority Date: 02/14/2002
• Status: Active Grant

• Current Assignee: Faro Technologies Incorporated
• Original Assignee: Faro Technologies Incorporated
• Inventors: Raab, Simon, Barber, Marc, Sajedi, Seyed Ali, Haslorchar, Kenneth J.
• Granted Patent: US 6,892,465 B2
• Time in Patent Office: Days
• US Class Current: 33/503
• CPC Class Codes: B23Q 35/04 using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
• CPC Class Codes: B25J 17/025 mounted in series
• CPC Class Codes: B25J 19/0016 using springs
• CPC Class Codes: B25J 19/0091 Shock absorbers in general F16F
• CPC Class Codes: B25J 9/0012 making use of synthetic construction materials, e.g. plastics, composites
• CPC Class Codes: B25J 9/023 Cartesian coordinate type
• CPC Class Codes: B25J 9/06 characterised by multi-articulated arms
• CPC Class Codes: B25J 9/1602 characterised by the control system, structure, architecture
• CPC Class Codes: G01B 11/005 coordinate measuring machines
• CPC Class Codes: G01B 11/03 by measuring coordinates of points
• CPC Class Codes: G01B 11/25 by projecting a pattern, e.g. one or more lines, moiré fringes on the object G01B11/255 takes precedence ; image analysis for depth or shape recovery G06T7/50
• CPC Class Codes: G01B 21/045 Correction of measurements G01B9/02055 takes precedence
• CPC Class Codes: G01B 5/004 for measuring coordinates of points
• CPC Class Codes: G01B 5/008 using coordinate measuring machines
• CPC Class Codes: G06T 7/521 from laser ranging, e.g. using interferometry; from the projection of structured light
• CPC Class Codes: Y10S 33/01 Magnetic

Abstract

A portable coordinate measurement machine comprises an articulated arm having jointed arm segments. The arm includes a base having an integrated magnet mount therein for attaching the arm to a magnetic surface.

Claims

1. A portable coordinate measurement machine (CMM) for measuring the position of an object in a selected volume, comprising:

a manually positionable articulated arm having opposed first and second ends, said arm including a plurality of jointed arm segments, each arm segment including at least one position transducer for producing a position signal;

a probe at said first end of said arm;

a base at said second end of said arm;

a magnetic mount forming a part of said base and being attached to said arm for mounting said arm to a magnetic surface; and

an electronic circuit which receives the position signals from the transducers and provides a digital coordinate corresponding to the position of the probe in a selected volume.

2. The CMM of claim 1 wherein said magnetic mount includes a housing and wherein said housing is threadably connected to said arm.

3. The CMM of claim 1 wherein said magnetic mount comprises:

an upper housing having opposed first and second ends, said upper housing having an opening therethrough and being formed from a non-magnetic material;

a pair of opposed extensions extending outwardly from said second end of said upper housing, said extensions being formed from a non-magnetic material;

a lower housing having spaced first and second sections, said extensions being sandwiched between said first and second sections, said lower housing being formed from a magnetic material;

a magnetic core in said lower housing, said magnetic core comprising a non-magnetic center sandwiched between first and second magnets, said magnetic core being rotatable with respect to said lower housing between an “

on”

position where said first and second magnets are aligned with said first and second lower housing sections and an “

off”

position where said first and second magnets are out of alignment with said first and second lower housing sections.

4. The CMM of claim 3 wherein:

said first end of said upper housing is threaded.

5. The CMM of claim 4 wherein said threading is tapered threading.

6. The CMM of claim 4 wherein:

said threaded first end of said upper housing is threaded to complimentary threading on said second end of said articulated arm.

7. The CMM of claim 3 wherein said upper and lower housings are cylindrical.

8. The CMM of claim 3 including:

an opening through said non-magnetic center of said magnetic core;

a shaft in said opening and coupled to said magnetic core; and

a lever attached to said shaft whereupon actuation of said lever will rotate both of said shaft and said magnetic core with respect to said lower housing.

9. The CMM of claim 8 including:

a pair of spaced bearings coupling said shaft to upper and lower housing.

10. The CMM of claim 9 including:

a cover plate enclosing said lower housing, said shaft being coupled to said cover plate via one of said bearings.

11. The CMM of claim 8 including:

a groove through a portion of said upper housing, said lever extending laterally from said shaft and through said groove.

12. The CMM of claim 8 wherein said base of said CMM having a base housing, said base housing surrounding said magnetic mount, and said lever extending outwardly of said base housing.

13. The CMM of claim 12 including:

a handle attached to the end of said lever which extends outwardly of said base.

14. The CMM of claim 3 including:

a plurality of threaded fasteners fastening said upper housing to said lower housing.

15. The CMM of claim 3 wherein said magnets are rare earth magnets.

16. The CMM of claim 3 wherein:

said magnetic core emits an amount of magnetic flux in the “

off”

position which is sufficient to drive the magnet to the “

on”

position without manual activation.

18. The magnetic mount of claim 12 wherein:

said first end of said upper housing is threaded.

19. The magnetic mount of claim 18 wherein said threading is tapered threading.

17. A mount for magnetically mounting an object to a magnetic surface comprising:

an upper housing having opposed first and second ends, said upper housing having an opening therethrough and being formed from a non-magnetic material;

a pair of opposed extensions extending outwardly from said second end of said upper housing, said extension being formed from a non-magnetic material;

a lower housing having spaced first and second sections, said extensions being sandwiched between said first and second sections, said lower housing being formed from a magnetic material;

a magnetic core in said lower housing, said magnetic core comprising a non-magnetic center sandwiched between first and second magnets, said magnetic core being rotatable with respect to said lower housing between an “

on”

position where said first and second magnets are aligned with said first and second lower housing sections and an “

off”

position where said first and second magnets are out of alignment with said first and second lower housing sections.

20. The magnetic mount of claim 17 wherein said upper and lower housings are cylindrical.

21. The magnetic mount of claim 17 including:

an opening through said non-magnetic center of said magnetic core;

a shaft in said opening and coupled to said magnetic core;

a lever attached to said shaft whereupon actuation of said lever will rotate both of said shaft and said magnetic core with respect to said lower housing.

22. The magnetic mount of claim 21 including:

a pair of spaced bearings coupling said shaft to upper and lower housing.

23. The magnetic mount of claim 22 including:

a cover plate enclosing said lower housing, said shaft being coupled to said cover plate via one of said bearings.

24. The magnetic mount of claim 21 including:

a groove through a portion of said upper housing, said lever extending laterally from said shaft and through said groove.

25. The magnetic mount of claim 17 wherein said magnets are rare earth magnets.

26. The magnetic mount of claim 17 wherein:

said magnetic core emits an amount of magnetic flux in the “

off”

position which is sufficient to drive the magnet to the “

on”

position without manual activation.