Materials evaluator

• US 5,557,039 A
• Filed: 06/02/1994
• Issued: 09/17/1996
• Est. Priority Date: 06/02/1994
• Status: Expired due to Fees

• Current Assignee: The University of Georgia Research Foundation, Inc.
• Original Assignee: The University of Georgia Research Foundation, Inc.
• Inventors: Davis, Ronald C., Annis, Patricia A., Bresee, Randall R.
• Primary Examiner(s): NOLAND, THOMAS
• Application Number:
  US08/252,754
• Time in Patent Office: 838 Days
• Field of Search: 73/7
• US Class Current: 73/7
• CPC Class Codes: G01N 2203/0278 Thin specimens
• CPC Class Codes: G01N 3/56 Investigating resistance to wear or abrasion
• CPC Class Codes: G01N 33/346 paper sheets
• CPC Class Codes: G01N 33/36 Textiles
• CPC Class Codes: G01N 33/367 Fabric or woven textiles optical analysis of moving sheets G01N21/86

Abstract

Devices and processes are disclosed for controlling and measuring precisely the many variables associated with fiber wear and transfer among materials. Specifically, one embodiment of the invention involves a slide and track arrangement for translating rotary motion of a crank shaft into reciprocal or, if desired, orbital motion of a second pad holding a sample or abrasive material against a first pad holding a sample material. The translation apparatus is such that even when orbital motion is selected, a constant angular relationship between the pattern of the materials held on the first pad and second pad is maintained. Devices are provided for controlling the speed of the motor; measuring the cyclical motion of the second pad; measuring and displaying the amount of load the second pad applies to the first pad and adjusting that load; changing and measuring the tension applied to the sample and/or abrasive materials and changing the angular orientation of the material on the first pad with respect to the material on the second pad. Thus, numerous variables that affect material wear are controlled or closely monitored, thereby allowing better understanding of the complexities of material wear.

Claims

1. A device for testing wear properties of materials, comprising:

(a) a first pad and a second pad, each with a surface for receiving materials and designed to move relative to one another;

(b) a first tensioning means, coupled to the first pad, for uniformly applying tension to received material;

(c) a second tensioning means, coupled to the second pad, for uniformly applying tension to received material; and

(d) drive means, attached to the first pad, for causing the first pad to orbit about the second pad without angulation.

2. A device according to claim 1 further comprising means for measuring the tension of the received material.

3. A device according to claim 2 further comprising means for adjusting the pressure between the first pad and the second pad.

4. A device according to claim 3 further comprising a load cell for measuring the pressure between the first pad and the second pad.

5. A device according to claim 4 further comprising a control panel for displaying the tension measurement and the pressure measurement.

6. A device for testing wear properties of materials, comprising:

(a) a housing;

(b) a first pad secured to a platform for receiving a first material, comprising;

(i) means for fixing the first material to the first pad; and

(ii) means for changing the tension of the first material by moving the first pad in relation to the platform;

(c) a locator disc, with an outer perimeter in which apertures are formed, for receiving the first pad;

(d) a second pad for receiving a second material;

(e) means for causing moving contact between the first pad and the second pad, comprising;

(i) drive means for rotating a shaft;

(ii) translation means for translating the rotation of the shaft to reciprocating or orbital motion; and

(iii) transmission means for transmitting the reciprocating or orbital motion produced by the translation means to cause movement between the first pad and second pad so that the first material is held in a constant angular relationship with the second material; and

(f) means for varying the pressure between the first pad and the second pad.

7. A device according to claim 6 further comprising a control panel, having:

(a) a switch for actuating the drive means;

(b) a microprocessor, coupled to a sensor, for controlling and displaying the number of cycles of reciprocating or orbital movement.

8. Apparatus for testing wear properties of materials while controlling and measuring certain of the variables associated with testing material wear, comprising:

(a) a housing;

(b) a first pad and a second pad, each with a surface for receiving materials and designed to move relative to one another;

(c) a motor, cooperating with a control means, for controlling the speed and number of cycles made by the motor;

(d) translation means, connecting to the motor, for translating the force produced by the motor into orbital or reciprocal motion;

(e) a transmission, connecting to the second pad and the translation means, comprising;

(i) at least two longitudinal rods;

(ii) at least two transverse rods;

(iii) means for connecting the longitudinal rods with the transverse rods; and

(iv) means for attaching to the second pad.

9. Apparatus according to claim 8 further comprising means for adjusting the pressure between the first pad and the second pad.

10. Apparatus according to claim 9 wherein the control means further comprises a display coupling to a sensor that determines the pressure between the first pad and the second pad.

11. Apparatus according to claim 8 further comprising means for adjusting the tension of the material received by the first pad or the second pad.

12. Apparatus according to claim 11 wherein the control means further comprises means for reading the tension of the material received by the first pad or the second pad.

13. Apparatus according to claim 8 further comprising means for adjusting the angular relationship of the first pad relative to the second pad.

14. Apparatus according to claim 8 wherein the translating means comprises:

(a) at least two transverse slides, both of which are held in a first track;

(b) a longitudinal slide, connected to at least one of the transverse slides, held in a second track; and

(c) means for restraining at least one of the transverse slides so that it does not move within its track.

15. A device for causing material wear by abrading material and evaluating the abrading process, the device comprising:

(a) a motor attached to translation means for translating motion produced by the motor into orbital or reciprocal motion, the translation means comprising;

(i) a plurality of transverse slides located within a first track, at least one of which is connected to and driven by the motor;

(ii) a longitudinal slide located within a second track; and

(iii) tabs for restraining at least one of the transverse slides within the first track to cause either orbital or reciprocal motion;

(b) transmission means, attached to the translation means and to a first means for holding a material, for transmitting the orbital or reciprocating motion of the translation means to the first holding means;

(c) second means for holding a material positioned so that the first holding means will be caused by the transmission means to move over the second holding means; and

(d) a control panel.

16. Apparatus according to claim 15 wherein the first holding means comprises a pad to which weights can be attached to increase the pressure of the pad upon the second holding means.

17. Apparatus according to claim 16 wherein the control panel comprises:

(a) means for controlling the speed of the motor;

(b) means for programming the number of cycles of the motor; and

(c) means for displaying the amount of pressure between the first holding means and the second holding means.

18. A device for causing and evaluating material wear, comprising:

(a) holding means for receiving and holding a first material;

(b) drive means for producing rotary motion;

(c) a slide and track system, connecting to the drive means, for creating orbital or reciprocal motion, comprising;

(i) a first transverse slide held within a first track;

(ii) a second transverse slide held within a second track; and

(iii) a longitudinal slide held within a third track;

(d) means for transmitting the orbital or reciprocal motion to the holding means thereby to move it over a surface and cause abrasion, comprising;

(i) at least two longitudinal rods;

(ii) at least two transverse rods;

(iii) means for connecting the longitudinal rods with the transverse rods; and

(iv) means for attaching to the holding means.