GB191409340A - Improvements in the Manufacture of Bifocal Lenses and Apparatus therefor. - Google Patents

Improvements in the Manufacture of Bifocal Lenses and Apparatus therefor.

Info

Publication number
GB191409340A
GB191409340A GB191409340DA GB191409340A GB 191409340 A GB191409340 A GB 191409340A GB 191409340D A GB191409340D A GB 191409340DA GB 191409340 A GB191409340 A GB 191409340A
Authority
GB
United Kingdom
Prior art keywords
arm
spindle
field
lens
fleming
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
Application number
Inventor
John Fleming
Robert James Fleming
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of GB191409340A publication Critical patent/GB191409340A/en
Expired legal-status Critical Current

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
    • B24B13/0012—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor for multifocal lenses

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

9340. Fleming, J., and Fleming, R. J., [trading. as Fleming, J. & R.]. April 15. Lenses, grinding.-The lower field of a bifocal lens is ground by means of a grinding-disk f loosely engaged by an eccentric pin c on a rotating spindle b, so that the disk moves round in a circular path and at the same time rotates on its axis. The spindle b is carried in a frame a and is pressed downwards with the requisite degree of pressure by means of an arm l engaging a sleeve n<1> loosely mounted on the' spindle between the driving-pulley d and a collar b<1> secured to the spindle, the lower end of the arm being pulled by an adjustable spring o. The lens A is secured by cement or pitch to an adjustable table h carried by a bracket j. If the lower field is to be of elongated or oval shape, the table is carried by an arm which is adjustably pivoted on a rod extending downwardly and is oscillated by a rotary crank-pin engaging a vertical slot at the upper end of the arm. By adjustment of the length of the arm, the radius of curvature of the field is altered. If a concave lower field is required, the lens holder may be suspended from a pivot above the lens. The lower field may first be roughly ground by means of a circular grinding- tool q, Fig. 5, which for this purpose replaces the eccentric pin and the disk. According to the Provisional Specification, the eccentric pin may be furnished with a spring working against a former to produce a field of corresponding shape.
GB191409340D 1914-04-15 1914-04-15 Improvements in the Manufacture of Bifocal Lenses and Apparatus therefor. Expired GB191409340A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191409340T 1914-04-15

Publications (1)

Publication Number Publication Date
GB191409340A true GB191409340A (en) 1914-11-26

Family

ID=32583249

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191409340D Expired GB191409340A (en) 1914-04-15 1914-04-15 Improvements in the Manufacture of Bifocal Lenses and Apparatus therefor.

Country Status (1)

Country Link
GB (1) GB191409340A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112405209A (en) * 2020-11-11 2021-02-26 上饶市光耀光学设备制造有限公司 Fine grinding and polishing device for processing optical lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112405209A (en) * 2020-11-11 2021-02-26 上饶市光耀光学设备制造有限公司 Fine grinding and polishing device for processing optical lens

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