GB612828A - Improvements in abrading laps for optical glass surfaces - Google Patents
Improvements in abrading laps for optical glass surfacesInfo
- Publication number
- GB612828A GB612828A GB37346A GB37346A GB612828A GB 612828 A GB612828 A GB 612828A GB 37346 A GB37346 A GB 37346A GB 37346 A GB37346 A GB 37346A GB 612828 A GB612828 A GB 612828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- abrading
- cellulose
- cellulose acetate
- pict
- lap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
- B24B13/023—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made for grinding several lenses simultaneously
Abstract
<PICT:0612828/IV(a)/1> <PICT:0612828/IV(a)/2> The abrading and/or polishing steps in cold working an optical surface on glass are carried out using a lap having a working surface comprising a thermoplastic synthetic resin or cellulose derivative moulding composition corresponding in shape to the optical surface to be produced and having a softening point above 95 DEG F. Thermoplastic resins specified are polystyrene, methylmethacrylate, vinyl resins, polyvinylidene chloride, while cellulose derivatives are cellulose acetate and acetobutyrate, ethyl cellulose, and oxidized cellulose acetate prepared as described in U.S.A. Specification 2,358,064 and used in conjunction with plasticizers comprising methyl phthalyl ethyl glycollate, triacetin, dimethyl phthalate dibutyl tartrate, camphor, diethyl phthalate, and tripropionin. An abrading lap for use as above comprises a metal supporting member 18, Fig. 2, and a synthetic resin mass 17. In Fig. 3, the metal support 20 is embedded in a mass of cellulose acetate composed of layers having different compositions and hardness.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB37346A GB612828A (en) | 1946-01-04 | 1946-01-04 | Improvements in abrading laps for optical glass surfaces |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB37346A GB612828A (en) | 1946-01-04 | 1946-01-04 | Improvements in abrading laps for optical glass surfaces |
Publications (1)
Publication Number | Publication Date |
---|---|
GB612828A true GB612828A (en) | 1948-11-18 |
Family
ID=9703269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB37346A Expired GB612828A (en) | 1946-01-04 | 1946-01-04 | Improvements in abrading laps for optical glass surfaces |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB612828A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2703470A (en) * | 1953-01-23 | 1955-03-08 | Mitchel Tyler Company | Lens grinding apparatus |
US2822647A (en) * | 1955-12-16 | 1958-02-11 | Younger Mfg Company | Method and apparatus for forming bifocal lenses |
GB2196886A (en) * | 1986-10-03 | 1988-05-11 | Wylde J & S Ltd | Lens tool |
CN113462947A (en) * | 2021-06-18 | 2021-10-01 | 厦门钨业股份有限公司 | WC-based hard alloy and application thereof |
-
1946
- 1946-01-04 GB GB37346A patent/GB612828A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2703470A (en) * | 1953-01-23 | 1955-03-08 | Mitchel Tyler Company | Lens grinding apparatus |
US2822647A (en) * | 1955-12-16 | 1958-02-11 | Younger Mfg Company | Method and apparatus for forming bifocal lenses |
GB2196886A (en) * | 1986-10-03 | 1988-05-11 | Wylde J & S Ltd | Lens tool |
GB2196886B (en) * | 1986-10-03 | 1991-02-06 | Wylde J & S Ltd | A lens tool |
CN113462947A (en) * | 2021-06-18 | 2021-10-01 | 厦门钨业股份有限公司 | WC-based hard alloy and application thereof |
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