Method of measuring a vehicular frame to determine alignment

• US 5,029,397 A
• Filed: 02/21/1989
• Issued: 07/09/1991
• Est. Priority Date: 02/21/1989
• Status: Expired due to Fees

• Current Assignee: Global Laser Systems Incorporated
• Original Assignee: Global Laser Systems Incorporated
• Inventors: Palombi, Vern
• Primary Examiner(s): YASICH, DANIEL
• Application Number:
  US07/312,719
• Time in Patent Office: 868 Days
• Field of Search: 33/286, 33/288, 33/608, 33/453, 33/645, 33/DIG. 21, 356/154, 356/155, 250/237
• US Class Current: 33/288
• CPC Class Codes: G01B 5/0025 Measuring of vehicle parts G01B5/003 takes precedence

Abstract

A method of measuring a vehicular frame to determine alignment, where measurements provided in the manufacturer'"'"'s specifications are known. The method consists of the following steps. Firstly, establishing at least one reference point spaced from a vehicular frame. Secondly, triangulating the vehicular frame by measuring the angle from the reference point to one or more coordinate points provided in the manufacturer'"'"'s specifications. One side of the triangle containing the reference points is a reference line of a known length. Thirdly, using the length of the reference line and the angular measurement from the reference points as a basis for trigonometric calculation.

Claims

1. A method of measuring a vehicular frame to determine alignment, comprising the steps of:

a. firstly, establishing two reference points spaced from a vehicular frame a known distance apart, thereby providing a scale for measurement;

b. secondly, establishing a plurality of pairs of left side and right side coordinate point along the length of the vehicular frame;

c. thirdly, measuring the angle from each reference point to the coordinate points; and

d. fourthly, using the scale provided by the known distance between the reference points measured angles from the reference points to the coordinate points as a basis for trigonometric calculation of the distances between the coordinate points on the vehicular frame.

2. A method as defined in claim 1, the reference points being positioned on a first plane parallel to one end of the vehicular frame.

3. A method of measuring a vehicular frame to determine alignment, comprising the steps of:

a. firstly, establishing a single reference point at the intersection of a first plane parallel to and spaced a known distance from a vehicular frame and a second plane perpendicular to the first plane;

b. secondly, establishing a plurality of pairs of left side and right side coordinate points along the length of the vehicular frame;

c. thirdly, measuring the angle from the reference point to the coordinate points; and

d. fourthly, using the scale provided by the known distance from the vehicular frame and the measured angles from the reference point to the coordinate points as a basis for trigonometric calculation of the distances between the coordinate points on the vehicular frame.

4. A method as defined in claim 3, the second plane being equidistant between a majority of pairs of left side and right side coordinate points on the vehicular frame.

5. The method as defined in claim 3, wherein the point of intersection of the first plane and second plane is established by:

a. Firstly, selecting a pair of coordinate points which appear to be damaged, one of the coordinate points being on the left side of the vehicular frame and the other being on the right side of the vehicular frame, the coordinate points being an equal distance from the first place;

b. Secondly, measuring the angle in relation to a plane perpendicular to the first plane from the proposed reference point to the selected left side coordinate point;

c. Thirdly, measuring the angle in relation to a plane perpendicular to the first plane from the proposed reference point to the selected right side coordinate point; and

d. Fourthly, shifting the proposed reference point along the first plane until the angles from the proposed reference point to the selected left side and right side coordinate points are identical.

6. A method of measuring a vehicular frame to determine alignment, where measurements provided in the manufacturer'"'"'s specifications are known, comprising the steps of:

a. firstly, establishing a plurality of pairs of left side and right side coordinate points along the length of a vehicular frame;

b. secondly, securing a target to each of the coordinate points such that each of the targets extend into a datum plane on or parallel to the datum line provided in the manufacturer'"'"'s specifications;

c. thirdly, establishing a single reference point at the intersection of a first plane parallel to and spaced a known distance from an end of a vehicular frame, and a second plane perpendicular to the first plane and equidistant between a majority of pairs of coordinate points on the left side and right side of the vehicular frame by;

i. selecting a pair of coordinate points which appear to be undamaged, one of the coordinate points being on the left side of the vehicular frame and the other being on the right side of the vehicular frame, the coordinate points being an equal distance from the first plane;

ii. positioning a laser at a proposed reference point and projecting a beam of light along the datum plane such that the beam of light strikes a target secured to a selected coordinate point;

iii. measuring the angle from the proposed reference point to the selected left side coordinate point;

iv. measuring the angle from the proposed reference point to the selected right side coordinate point; and

v. shifting the proposed reference point along the first plane until the angles from the proposed reference point to the selected left side and right side coordinate points are identical;

d. fourthly, triangulating the vehicular frame by positioning a laser at the reference point and projecting a beam of light along the datum plane such that the beam of light strikes the targets secured to the coordinate points and measuring the angle in relation to the second plane from the reference point to the selected coordinate points; and

e. fifthly, using the known distance to the vehicular frame, the distance from the front of the vehicular frame of the coordinate points as provided in the manufacturers specifications, and the angular measurement from the reference point to the coordinate points as a basis for trigonometric calculation of the distances between the coordinate points on the vehicular frame, the calculations being performed by a computer connected to the laser, the computer being programmed to receive and record data regarding the angular adjustment of the laser, perform trigometric calculations and graphically display the correct positioning and the existing positioning of the coordinate points.

7. A measuring device for use in vehicular repair, comprising:

a. a tripod support of a known length, having a first end and a second end, and having extendible legs whereby the height of the support may be adjusted;

b. a laser movable between the first end and second end of the support, and rotatably mounted on the support such that the angular positioning of the laser on a horizontal plane may be adjusted;

c. a rotary encoder for measuring and transmitting data with respect to the angular positioning of the laser; and

d. a computer programmed to receive signals from the signal means, and using data regarding the angular adjustment of the laser when focused on targets secured to coordinate points on a vehicle frame from both the first end and the second end of the support, and the scale provided by the known distance between the first end and second end of the support perform trigometric calculations as to the distance between the coordinate points.

8. A method of measuring a vehicular frame to determine alignment, comprising the steps of:

a. firstly, establishing two reference points spaced from a vehicular frame a known distance apart, thereby providing a scale for measurement;

b. secondly, establishing a plurality of pairs of left side and right side coordinate points along the length of the vehicular frame;

c. thirdly, securing a target to each one of the coordinate points, each target having an end extending into a datum plane on or parallel to a datum line as provided in manufacturer'"'"'s specifications;

d. fourthly, projecting a beam of light from a laser from each reference point along the datum plane such that the beam of light strikes one of the targets and measuring the angle from each reference point to the coordinate points; and

e. fifthly, using the scale provided by the known distance between the reference points and the measured angles from the reference points to the coordinate points as a basis for trigonometric calculation of the distances between the coordinate points on the vehicular frame.

9. The method as defined in claim 8, having a computer connected to the laser, the computer being programmed to receive and record data regarding the angular adjustment of the laser and to perform trigonometric calculations.

10. The method as defined in claim 9, the computer being programmed to graphically display the correct positioning and the existing positioning of coordinate points.

11. The method as defined in claim 8, the target comprising:

a. a shaft having a first end and a second end;

b. means at one of the ends of the shaft for securing the shaft to a vehicular frame such that the shaft extends vertically from one of the coordinate points; and

c. a member slidably moveable between the first end and the second end of the shaft, such that the member may be positioned in the datum plane.

12. A measuring device for use in vehicular repair, comprising:

a. a support of a known length, having a first end and a second end;

b. a laser movable between the first end and second end of the support, the laser being rotatably mounted on the support such that the angular positioning of the laser on a horizontal plane may be adjusted;

c. a rotary encoder for measuring and transmitting data with respect to the angular positioning of the laser; and

d. a computer programmed to receive signals from the signal means, and using data regarding the angular adjustment of the laser when focused on targets secured to coordinate points on a vehicular frame from both the first end and the second end of the support and the scale provided by the known distance between the first end and second end of the support perform trigonometric calculations as to the distances between the coordinate points.

13. A measuring device as defined in claim 12, the support being a tripod.

14. A measuring device as defined in claim 13, the tripod having extendible legs whereby the height of the support may be adjusted.

15. A measuring device as defined in claim 12, having an incremental rotary actuator which converts electrical signal inputs to rotation of the laser.

16. A measuring device as defined in claim 12, the support having a mounting beam with a longitudinal track and the laser having means for engaging the track such that the laser is secured to and movable between the first and second ends of the mounting beam.

17. A measuring device as defined in claim 16, the longitudinal track being a cavity with parallel side walls, at least one of the side walls having a plurality of teeth, the means for engaging the track being a gear with a plurality of teeth which extends into the cavity such that the teeth of the gear mesh with the teeth in the side wall.

18. A measuring device as defined in claim 17, motor drive means being provided to propel the laser between the first and second ends of the mounting beam.