Thermoplastic optical lap with reinforced webbing

• US 5,779,529 A
• Filed: 11/25/1996
• Issued: 07/14/1998
• Est. Priority Date: 11/25/1996
• Status: Expired due to Fees

• Current Assignee: Simage OY
• Original Assignee: Bizer Industries
• Inventors: Bizer, Jerry L.
• Primary Examiner(s): Eley, Timothy V.
• Application Number:
  US08/753,417
• Time in Patent Office: 596 Days
• Field of Search: 451/2, 451/540, 451/542, 451/546, 451/548, 451/550, 451/905
• US Class Current: 451/550
• CPC Class Codes: B24B 13/01 Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools

Abstract

The present invention defines an optical polishing lap comprising a thermoplastic polymer resin of uniform density, porosity, and texture throughout including the surface of the lap. The optical lap is of unitary construction formed having a solid main body with a generally domed-shaped upper head portion of substantially monolithic form providing an upper curved surface. The optical lap includes a lower flat surface having an attachment means defining an integral base portion extending downward opposite the lower flat surface offset from the main body. The integral base portion defines webbing having a continuous peripheral rail extending around the edge. The peripheral base rail includes parallel side rail means defining a pair of straight outside walls and an angled inside wall sloped inwardly toward the center of the main body and toward one another providing a thicker rail at the intersection of the lower flat surface to provide additional structural strength and dimensional stability to the rails and the main body during use. A pair of reinforcement members composed of metal such as steel, iron, brass, copper, nickel or other material harder and more durable than the dome is integrally formed and embedded within the webbing side rail means normal thereto providing structural support.

Claims

1. An optical lap of unitary construction comprising a thermoplastic polymer resin of uniform density, porosity, and texture throughout formed having a solid main body with a generally domed-shaped upper head portion of substantially monolithic form providing an upper curved surface and a lower flat surface having an attachment means defining an integral base portion extending downward opposite the lower flat surface offset from said main body, said integral base portion, comprising:

webbing having a continuous peripheral rail extending therearound;

said continuous peripheral rail including a pair of parallel side rails connecting a pair of opposing curved end rails; and

at least one reinforcement member comprising harder material than said dome body and said integral base, said at least one reinforcement member being integrally formed and embedded within said webbing, said at least one reinforcement member being positioned normal to and inbetween said pair of parallel side rails.

2. The optical lap of claim 1, including a pair of reinforcement members.

3. The optical lap of claim 1, said parallel side rails defining a pair of straight sidewall surfaces extending normal to said lower flat surface offset from said main body having an angled inside wall sloped inwardly toward the center of the main body and toward one another providing a thicker rail at the intersection of said integral base with said main body to provide additional structural strength and dimensional stability to said side rails and the main body during use for attaching said lap to a lap grinding machine, a lap cutter, or an optical polishing machine.

4. The optical lap of claim 1, said dome defining a curved dome sidewall, and said integral base including opposing curved end rails defining outer sidewalls converging with said curved dome sidewall and each of said curved end rails having an angled inner sidewall sloped inwardly toward the center of the main body and toward one another providing a thicker rail at the intersection of said integral base with said main body to provide additional structural strength and dimensional stability to said curved rails and said main body.

5. The optical lap of claim 1, said reinforcement members being selected from the group consisting of steel, iron, brass, copper, nickel, fiberglass, graphite fiber, or combinations thereof.

6. The optical lap of claim 1, wherein said thermoplastic polymer is selected from the group consisting of nylon, polyvinyl chloride, polypropylene, polyethylene, acrylonitrile butydiene styrene, polycarbonate, or combinations thereof.

7. The optical lap of claim 6, wherein said thermoplastic polymer is augmented with filler, selected from the group consisting of glass fibers, mineral fillers, or carbon fibers.

8. The optical lap of claim 7, wherein the percentage of said mineral filler in said thermoplastic is between 25 and 50 percent by weight of said thermoplastic, the remainder being comprised of thermoplastic resin.

9. The optical lap of claim 8, wherein said mineral filler is talc.

10. The optical lap of claim 1, including a locator tab.

11. The optical lap of claim 1, said webbing defining a recessed center.