Mechanical structure and guide block

• US 5,429,438 A
• Filed: 07/12/1993
• Issued: 07/04/1995
• Est. Priority Date: 07/12/1993
• Status: Expired due to Term

• Current Assignee: 80/20 Inc.
• Original Assignee: 80/20 Inc.
• Inventors: Wood, John D.
• Primary Examiner(s): Hannon, Thomas R.
• Application Number:
  US08/090,297
• Time in Patent Office: 722 Days
• Field of Search: 384/7, 384/9, 384/26, 384/41, 384/42
• US Class Current: 384/42
• CPC Class Codes: F16C 29/02 Sliding-contact bearings

Abstract

A mechanical structure comprising at least one extrusion having a plurality of sides and a longitudinal slot generally centrally positioned in each side, a guide block having a plurality of guide surfaces disposed adjacent respective ones of the plurality of sides of the extrusion, and a plurality of wear pads disposed between respective surfaces of the extrusion and guide surfaces of the guide block to reduce friction between the same, each wear pad having an alignment key positioned to be received within one of the slots of the extrusion, and a plurality of wear surfaces in load bearing contact with the adjacent surfaces of the extrusion.

Claims

1. A mechanical structure comprising:

at least one extrusion having a plurality of sides and a longitudinal slot generally centrally positioned in each side;

a guide block having a plurality of guide surfaces disposed adjacent respective ones of said plurality of sides of the extrusion;

a plurality of wear pads disposed between respective surfaces of the extrusion and guide surfaces of the guide block to reduce friction between the same, each wear pad having an alignment key positioned to be received within one of the slots of the extrusion, and a plurality of wear surfaces in load bearing contact with the adjacent surfaces of the extrusion.

2. The mechanical structure of claim 1, wherein the guide block includes a plurality of intersecting walls, at least one of which extends beyond a point of intersection with another wall thereby forming a flange that is adapted to couple to a member of the mechanical structure.

3. The mechanical structure of claim 2, wherein the flange is configured to include an aperture that receives a fastener for coupling to the member of the mechanical structure.

4. The mechanical structure of claim 1, wherein the guide block is generally U-shaped in cross-section.

5. The mechanical structure of claim 1, wherein there are two extrusions coupled together side by side, the guide block is generally U-shaped in cross-section, and there are four wear pads coupled to three inner surfaces of the guide block.

6. The mechanical structure of claim 1, wherein the extrusion has a generally rectangular cross-section.

7. The mechanical structure of claim 1, wherein the alignment key is positioned to lie in the middle of the body of each wear pad so that each wear pad has a generally T-shaped cross-section.

8. The mechanical structure of claim 7, wherein each wear pad is integrally formed.

9. The mechanical structure of claim 1, further comprising means for coupling the wear pads to the guide surfaces of the guide block.

10. The mechanical structure of claim 9, wherein the coupling means includes a plurality of fasteners, and further wherein the guide block and wear pads are configured to include a plurality of apertures that receive the fasteners.

11. The mechanical structure of claim 1, wherein the extrusion and guide block are formed from one of aluminum and an aluminum alloy.

12. The mechanical structure of claim 11, wherein the aluminum alloy is 6105-T5 aluminum alloy.

13. The mechanical structure of claim 1, wherein the wear pad is made from ultra high molecular weight polyethylene.

14. An apparatus for providing guided linear motion in a mechanical structure, comprising:

an extrusion having a generally rectangular cross-section and a channel on each side of the extrusion;

a linear slide for slidably receiving the extrusion in one of a plurality of orientations, the linear slide including a housing having a generally U-shaped cross-section and a plurality of bearings positioned, respectively, along inner surfaces of the U-shaped housing, each of the bearings having a body and a member positioned to lie within one of the channels of the extrusion so that the bearings cooperate with adjoining surfaces of the extrusion and channel in carrying load forces; and

means for attaching the bearings to the housing.

15. The apparatus of claim 14, wherein the housing is configured to include a flange adapted for coupling to a member of the mechanical structure.

16. The apparatus of claim 15, wherein the flange is configured to include an aperture that receives a fastener for coupling the linear slide to the member of the mechanical structure.

17. The apparatus of claim 14, wherein the housing includes a plurality of walls of at least two different sizes, that are coupled together.

18. The apparatus of claim 17, wherein the housing is integrally formed.

19. The apparatus of claim 14, wherein there are two extrusions coupled together side by side and four wear pads coupled to three inner surfaces of the housing.

20. The apparatus of claim 14, wherein each channel of the extrusion has a generally T-shaped cross-section.

21. The apparatus of claim 14, wherein the bearing member is positioned to lie in the middle of the body of each bearing so that each bearing has a generally T-shaped cross-section.

22. The apparatus of claim 14, wherein the attaching means includes a plurality of fasteners, and further wherein the housing and bearings are configured to include a plurality of apertures that receive the fasteners.

23. The apparatus of claim 14, wherein the extrusion and housing are formed from one of aluminum and an aluminum alloy.

24. The apparatus of claim 23, wherein the aluminum alloy is 6105-T5 aluminum alloy.

25. The apparatus of claim 14, wherein the wear pad is made from ultra high molecular weight polyethylene.