Hermetically sealed scale platform

• US 8,178,797 B2
• Filed: 12/30/2009
• Issued: 05/15/2012
• Est. Priority Date: 12/30/2009
• Status: Active Grant

• Current Assignee: Mettler-Toledo Incorporated (Mettler-Toledo International Inc.)
• Original Assignee: Mettler-Toledo Incorporated (Mettler-Toledo International Inc.)
• Inventors: Bayer, Jason, Perrea, Michael, Rice, Thomas S., Wyman, Pete, Ticknor, Anthony
• Primary Examiner(s): Gibson, Randy W
• Application Number:
  US12/650,177
• Publication Number:
  US 20110155476A1
• Time in Patent Office: 867 Days
• Field of Search: 177132-134, 177238-244, 177/262, 177/263
• US Class Current: 177/132
• CPC Class Codes: G01G 21/28 Frames, Housings
• CPC Class Codes: G01G 21/30 Means for preventing contamination by dust

Abstract

A hermetically sealed scale for use in a weighing scale. A scale of the present invention may include a load receiving plate and a bottom plate, between which is sandwiched a supporting rib structure that preferably includes a plurality of perimeter members that form sealed upright sides of the scale. The supporting rib structure, load receiving plate and bottom plate cooperate to form a substantially rigid and hermetically sealed sandwich structure. The load receiving plate may be joined to the supporting rib structure by perimeter welding or another bonding technique that permits the joining material to be subsequently shaped to form a smooth transition between the load receiving plate and the perimeter members of the scale.

Claims

1. A hermetically sealed scale platform, comprising:

a supporting rib structure, said supporting rib structure including a plurality of interior ribs connected to a plurality of perimeter members, said perimeter members forming upstanding sealed sides of said scale platform and including outer vertical legs having a bend near a free end thereof that forms corresponding upper horizontal legs and imparts a rounded exposed perimeter edge to said scale platform;

a load receiving plate residing atop of and attached to said horizontal legs of said supporting rib structure, said load receiving plate for receiving objects to be weighed; and

a bottom plate attached to a bottom surface of said supporting rib structure;

wherein said supporting rib structure, said load receiving plate and said bottom plate cooperate to form a substantially rigid and hermetically sealed sandwich structure; and

wherein said load receiving plate is attached to said perimeter members of said supporting rib structure in a manner that forms a smooth and blended transition surface therebetween.

2. The scale platform of claim 1, wherein said outer vertical legs of said perimeter members diverge inward from said bend toward said bottom plate.

3. The scale platform of claim 1, wherein perimeter edges of said load receiving plate overlap and are bonded in a sealed manner to said upper horizontal legs of corresponding perimeter members.

4. The scale platform of claim 3, wherein said perimeter edges of said load receiving plate are welded to said upper horizontal legs of corresponding perimeter members and said welds are subsequently shaped to form a smooth transition between the edges of said load receiving plate and said rounded exposed perimeter edge of said perimeter members.

5. The scale platform claim 1, wherein perimeter edges of said load receiving plate abut and are bonded in a sealed manner to corresponding edges of said upper horizontal legs of corresponding perimeter members.

6. The scale platform of claim 5, wherein said perimeter edges of said load receiving plate are welded to abutting edges of said upper horizontal legs of corresponding perimeter members and said welds are subsequently shaped to form a smooth overall receiving surface.

7. The scale platform of claim 1, wherein perimeter edges of said bottom plate are welded to a bottom surface of corresponding perimeter members and said welds are subsequently shaped to form a smooth transition between the edges of said load receiving plate and a corresponding exposed perimeter edge of said perimeter members.

8. The scale platform of claim 1, wherein said bottom plate is adhesively bonded to a bottom surface of corresponding perimeter members.

9. The scale platform of claim 1, further comprising a number of load cell mounting elements interposed between perimeter members, each load cell mounting element provided with substantially the same contour as said perimeter members.

10. The scale platform of claim 9, wherein a load cell mounting element is located at each corner of said scale and has ends of associated perimeter members attached in a sealed manner thereto.

11. A hermetically sealed scale platform, comprising:

a supporting rib structure, said supporting rib structure including a plurality of interior ribs connected to a plurality of perimeter members that form upstanding sealed sides of said scale platform, said perimeter members including outer vertical legs having a bend near a free end thereof that forms an upper horizontal leg, said bend imparting a rounded exposed perimeter edge to said scale platform;

a load receiving plate for receiving objects to be weighed, perimeter edges of said load receiving plate overlapping and welded in a sealed manner to said upper horizontal legs of corresponding perimeter members, said welds subsequently shaped to form a smooth transition between the edges of said load receiving plate and said rounded exposed perimeter edge of said perimeter members; and

a bottom plate attached to a bottom surface of said supporting rib structure;

wherein said supporting rib structure, said load receiving plate and said bottom plate cooperate to form a substantially rigid and hermetically sealed sandwich structure.

12. The scale platform of claim 11, wherein said outer vertical legs of said perimeter members diverge inward from said bend toward said bottom plate.

13. The scale platform of claim 11, wherein perimeter edges of said bottom plate are welded to a bottom surface of corresponding perimeter members and said welds are subsequently shaped to form a smooth transition between the edges of said load receiving plate and a corresponding exposed perimeter edge of said perimeter members.

14. The scale platform of claim 11, further comprising a number of load cell mounting elements interposed between perimeter members, each load cell mounting element provided with substantially the same contour as said perimeter members.

15. The scale platform of claim 14, wherein a load cell mounting element is located at each corner of said scale platform and has ends of associated perimeter members attached in a sealed manner thereto.

16. A hermetically sealed scale platform, comprising:

a supporting rib structure, said supporting rib structure including a plurality of interior ribs connected to a plurality of perimeter members that form upstanding sealed sides of said scale platform, said perimeter members including outer vertical legs having a bend near a free end thereof that forms an upper horizontal leg, said bend imparting a rounded exposed perimeter edge to said scale platform;

a load receiving plate for receiving objects to be weighed, perimeter edges of said load receiving plate abutting and welded in a sealed manner to corresponding edges of said upper horizontal legs of said perimeter members, said welds subsequently shaped to form a smooth to form a smooth overall receiving surface; and

a bottom plate attached to a bottom surface of said supporting rib structure;

wherein said supporting rib structure, said load receiving plate and said bottom plate cooperate to form a substantially rigid and hermetically sealed sandwich structure.

17. The scale platform of claim 16, wherein said outer vertical legs of said perimeter members diverge inward from said bend toward said bottom plate.

18. The scale platform of claim 16, wherein perimeter edges of said bottom plate are welded to a bottom surface of corresponding perimeter members and said welds are subsequently shaped to form a smooth transition between the edges of said load receiving plate and a corresponding exposed perimeter edge of said perimeter members.

19. The scale platform of claim 16, further comprising a number of load cell mounting elements interposed between perimeter members, each load cell mounting element provided with substantially the same contour as said perimeter members.

20. The scale platform of claim 16, wherein a load cell mounting element is located at each corner of said scale and has ends of associated perimeter members attached in a sealed manner thereto.