Apparatus, a system and a method for monitoring a position of a shaft element in a cylinder and an apparatus, a system and a method for cleaning of the shaft element

• US 6,952,009 B1
• Filed: 10/17/2000
• Issued: 10/04/2005
• Est. Priority Date: 10/17/2000
• Status: Expired due to Term

• Current Assignee: Motion Controls, LLC
• Original Assignee: Motion Controls, LLC
• Inventors: Engstrand, Bradley
• Primary Examiner(s): Luu, Thanh X.
• Application Number:
  US09/690,151
• Time in Patent Office: 1,813 Days
• Field of Search: 250/231.1, 250/227.11, 250/216, 250/221, 250/231.19, 123/193.1, 123/93.1, 92/5.R, 713/61, 71/1, 913/61, 91/1
• US Class Current: 250/231.1
• CPC Class Codes: G01D 5/28 with deflection of beams of light, e.g. for direct optical indication G01D5/40 takes precedence; mechanical adjustment G01D5/264

Abstract

An apparatus, a system and a method are provided for monitoring position of a machine element within a mechanical system and/or cleaning a machine element. A light source and sensor may be positioned within a cylinder. The sensor may detect the intensity of light within the cylinder as a shaft element moves laterally throughout the cylinder. The measurement may indicate the position of the shaft element within the cylinder. In addition, a seal, a wire brush and/or a bronze brush may be placed near an end wall of a cylinder. The seal may surround the shaft element. Furthermore, the shaft element may be coated with a compound, such as a nitrile compound or a ceramic compound or the like. The wire brush and bronze brush may be in contact with the shaft element and may scrape any contaminants, such as weld spatter, which may be deposited on the shaft element.

Claims

1. An apparatus for measuring displacement, the apparatus comprising:

a machine element having a body defining an interior wherein the body has an interior surface and a length defined between a first end and a second end wherein the interior surface has a light-absorbing coating;

a first wall at the first end wherein the first wall is planar and further wherein the first wall abuts the body of the machine element;

a second wall at the second end substantially enclosing the interior;

a shaft element movable within the machine element;

a head element attached to the shaft element adjacent to the interior surface of the machine element;

a light source on the first wall of the machine element wherein the light source extends inward with respect to the interior of the machine element wherein the light source emits a light into the interior of the machine element; and

a sensor positioned on the first wall of the machine element wherein the sensor detects intensity of emitted light within the interior of the machine element which is not absorbed by the coating on the interior surface of the machine element wherein the intensity of light corresponds to a position of the head element within the machine element at a point between the first end and the second end.

2. The apparatus of claim 1 further comprising:

a coating on the shaft element.

3. The apparatus of claim 1 wherein the light-absorbing coating is an anodizing compound.

4. The apparatus of claim 1 further comprising:

a seal disposed around the shaft element.

5. The apparatus of claim 1 further comprising:

a second sensor attached to the second wall.

6. The apparatus of claim 1 further comprising:

a first brush positioned at the first wall or the second wall of the machine element.

7. The apparatus of claim 6 wherein the first brush is constructed from wire.

8. The apparatus of claim 1 further comprising:

a second light source attached to the machine element at the second wall of the machine element.

9. The apparatus of claim 1 wherein the first wall is parallel to the second wall.

10. The apparatus of claim 1 further comprising:

a coating on the head element.

11. An apparatus for cleaning a machine component, the apparatus comprising:

a machine element having a body defining an interior wherein the body has an interior surface which is interior to the machine element wherein the interior surface has a light-absorbing coating and further wherein the body has a length defined between a first end and a second end wherein the first end has a wall having an opening and further wherein the wall has an exterior surface which is exterior to the machine element;

a shaft element which is moved within the machine element wherein the shaft element extends through the opening in the wall;

a head element within the interior of the machine element wherein the head element is attached to the shaft element; and

a first brush positioned on the exterior surface of the wall wherein the first brush is exterior to the machine element and contacts the shaft element.

12. The apparatus of claim 11 further comprising:

a seal disposed around the shaft.

13. The apparatus of claim 11 further comprising:

a coating on the shaft element.

14. The apparatus of claim 11 further comprising:

a second brush positioned on the exterior surface of the wall.

15. The apparatus of claim 11 further comprising:

a light source attached to the machine element.

16. The apparatus of claim 11 further comprising:

a sensor positioned to receive reflected light within the machine element.

17. A method for measuring displacement of a machine element, the method comprising the steps of:

providing a machine element having a body defining an interior wherein the body has an interior surface and a length defined between a first wall and a second wall wherein the interior surface has a light-absorbing coating;

providing a shaft element which moves within the machine element;

attaching a head element to the shaft element wherein the head element moves towards the first wall while simultaneously moving away from the second wall;

positioning the head element adjacent to the interior surface of the machine element;

attaching a light source to the machine element at the first wall wherein the light source emits light into the interior of the machine element wherein the first wall is planar;

attaching a sensor to the machine element at the first wall wherein the shaft element is located between the sensor and the light source; and

measuring intensity of emitted light which is not absorbed by the coating on the interior surface of the machine element wherein the intensity of emitted light is detected by the sensor.

18. The method of claim 17 further comprising the steps of:

moving the shaft element; and

producing an output signal as the shaft element moves within the machine element.

19. The method of claim 18 further comprising the steps of:

providing a processing unit that receives the output signal; and

displaying the output signal.

20. The method of claim 17 further comprising the step of:

positioning a seal within the machine element.

21. The method of claim 17 further comprising the step of:

attaching a first brush to the machine element.

22. The method of claim 21 further comprising the step of:

attaching a second brush to the machine element.

23. An apparatus for measuring displacement, the apparatus comprising:

a machine element having a body defining an interior wherein the body has an interior surface and a length defined between a first end and a second end wherein the interior surface has a light-absorbing coating;

a first wall at the first end;

a second wall at the second end substantially enclosing the interior;

a shaft element movable within the machine element;

a head element attached to the shaft element adjacent to the interior surface of the machine element;

a light source on the first wall of the machine element wherein the light source emits a light into the machine element;

a sensor positioned to detect intensity of emitted light within the machine element which is not absorbed by the coating on the interior surface of the machine element wherein the intensity of light corresponds to a position of the head element within the machine element at any point between the first end and the second end; and

a first brush positioned at the second wall of the machine element.

24. The apparatus of claim 23 wherein the first brush is constructed from wire.