US547138A - Apparatus for forming curved surfaces - Google Patents

Apparatus for forming curved surfaces Download PDF

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US547138A
US547138A US547138DA US547138A US 547138 A US547138 A US 547138A US 547138D A US547138D A US 547138DA US 547138 A US547138 A US 547138A
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frame
curved surfaces
lens
forming curved
spindle
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    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/06—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for grinding races, e.g. roller races

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  • the prime object of the present invention is to provide an apparatus whereby a true parabolic surface can be produced on lenses for use in cameras. It is well known that a paraboloidal lens possesses great advantages over a spherical lens by reason of its annulling The difficulty heretofore attending the production of paraboloidal lenses and the consequent expense has made their employment very limited.
  • My invention is based upon the known principle that if one leg of a right angle passes through the focus of a parabola while the vertex of the angle moves in a line tangent to the parabola at its apex the other leg of the right angle will always be tangent to the parabola.
  • Figure 1 shows a perspective view ofa machine embodying the invention.
  • Fig.2 shows a section on line 2 2 of Fig. 1.
  • Fig. 3 shows a section on line 3 3 of Fig. 1.
  • Fig. 4 shows a top plan view of the machine.
  • the supporting-frame of theapparatus comprises a base a, adapted to stand on a bench or other elevated support, a pair of uprights a at opposite sides of said base, and another pair of uprights a at the other two opposite sides of the base.
  • the uprights a are slotted vertically, and guide-strips b are secured at opposite sides of the slots, said strips being set obliquely for convenience in assembling the parts.
  • a block 0 is fitted to each set of guiding-strips, and one of said strips is marked with graduations and the adjacent edge of the block carries a Vernier.
  • the block is tapped to receive a vertical adj ustment-screw d,whose opposite ends are journaled in bearings d, fastened across the ends of the slicleways formed by the strips 1).
  • a milled head (1 on said screw provides means for turning the latter, and an extremely accurate and minute adjustment can be secured by the reading of the Vernier.
  • Each of the blocks 0 carries on its inner side a disk 0, having trunnions which journal in the block and in a bracket 0 fastened to the block, and the said disk is slotted diametrically to receive the pendent arm a of a frame 6, which lies in a plane at right angles to the arms 6 and carries an abrading-diskfin the same plane.
  • Horizontal guideways g are arranged on the inner sides of the uprights a at right angles to the vertical ways I), and pins e projecting from the ends of the frame 6, enter said guideways.
  • the uprights a support a horizontal bar a in which a vertical spindle h finds a bearing, and the upper end of said spindle carries a chuck it, in which is removably secured a suitable support It for the lens 2, the latter being cemented to the support.
  • the spindle extends down through the base a and the bench and through a bracket 2", fastened under the bench, and a pulleyj is affixed to the spindle to receive rotary motion from any suitable source.
  • the spindle is arranged to slide vertically to accommodate different thicknesses of lenses, and its lower end is supported on one end of a lever 70, to which a treadle (not shown) is connected, so that-the operator can conveniently control the position of the lens.
  • the upper ends of uprights c are braced by cross-bars a
  • the operation is as follows: The roughlyformed lens is cemented to the support 72. and the latter fastened in the chuck, and then the spindle is set to revolving. The frame 6 is moved back and forth, and the lens raised into contact with the grinding-disk. The horizontal guideways g control the traverse of the frame, while the disks 0' keep the frames pivot at one central point, which is in a line at right angles to the guideway g. The result is a paraboloidal surface on the lens, the
  • grinding-disk being always in a plane tangent to a parabola whose focus-line embraces the center of oscillation of said disk.
  • the blocks 0 can beset at any focus required, the verniers enabling the operator to read the distance from the tangent slideways g to about one one-thousandth of an inch.
  • the swinging frame is here shown as provided with a ball at and a handle m, by which to operate it.

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

Description

(No Model.) I 2 Sheets-Sheet 1.
T. M. CLARK. APPARATUS FOR'FOBMING GURVED SURFACES.
No. 547,138. Patented Oct. 1, 1895.
47 A A T A Nmm m k. a M
WITNESSES 704% 6156 046,.
ANDREW HGRAKAM.PHUTUUTNEWASNINGIUNAQC.
(No Model.) 2 SheetsSheet 2'.
- T. M. O-LARK.
APPARATUS FOR FORMING'GURVED SURFACES.
No. 547,138. Patented Oct. 1, 1895'.
WITNESSES AN nREW BI'RAHAM. FHUfO-LITHO.WA5KINGTON ,n C.
spherical aberration.
"Genre ATENIT FMQE...
THEODORE M. CLARK, OF NEWVTON, MASSACHUSETTS.
APPARATUS FOR FORMING CU RVED 8U RFACES.
SPECIFICATION forming part of Letters Patent No. 57,138, dated October 1,1895.
Application filed J'nly 1394. Serial No. 516,6Z4- (No modelJ To all whom it may concern.-
Be it known that I, THEODORE M. CLARK, of Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Apparatus for Forming Curved Surfaces, of which the following is a specification.
The prime object of the present invention is to provide an apparatus whereby a true parabolic surface can be produced on lenses for use in cameras. It is well known that a paraboloidal lens possesses great advantages over a spherical lens by reason of its annulling The difficulty heretofore attending the production of paraboloidal lenses and the consequent expense has made their employment very limited.
I have devised an apparatus of comparatively simple construction which will accurately form paraboloidal surfaces in a thoroughly practical manner.
My invention is based upon the known principle that if one leg of a right angle passes through the focus of a parabola while the vertex of the angle moves in a line tangent to the parabola at its apex the other leg of the right angle will always be tangent to the parabola.
In addition to the capability of the apparatus to produce paraboloidal surfaces it may be adapted for the production of surfaces of other contour.
An embodiment of the invention is illustrated in the accompanying drawings, which form part of this specification.
Figure 1 shows a perspective view ofa machine embodying the invention. Fig.2 shows a section on line 2 2 of Fig. 1. Fig. 3 shows a section on line 3 3 of Fig. 1. Fig. 4 shows a top plan view of the machine.
The supporting-frame of theapparatus comprises a base a, adapted to stand on a bench or other elevated support, a pair of uprights a at opposite sides of said base, and another pair of uprights a at the other two opposite sides of the base. The uprights a are slotted vertically, and guide-strips b are secured at opposite sides of the slots, said strips being set obliquely for convenience in assembling the parts. A block 0 is fitted to each set of guiding-strips, and one of said strips is marked with graduations and the adjacent edge of the block carries a Vernier. The block is tapped to receive a vertical adj ustment-screw d,whose opposite ends are journaled in bearings d, fastened across the ends of the slicleways formed by the strips 1). A milled head (1 on said screw provides means for turning the latter, and an extremely accurate and minute adjustment can be secured by the reading of the Vernier.
Each of the blocks 0 carries on its inner side a disk 0, having trunnions which journal in the block and in a bracket 0 fastened to the block, and the said disk is slotted diametrically to receive the pendent arm a of a frame 6, which lies in a plane at right angles to the arms 6 and carries an abrading-diskfin the same plane.
Horizontal guideways g are arranged on the inner sides of the uprights a at right angles to the vertical ways I), and pins e projecting from the ends of the frame 6, enter said guideways.
The uprights a support a horizontal bar a in which a vertical spindle h finds a bearing, and the upper end of said spindle carries a chuck it, in which is removably secured a suitable support It for the lens 2, the latter being cemented to the support. The spindle extends down through the base a and the bench and through a bracket 2", fastened under the bench, and a pulleyj is affixed to the spindle to receive rotary motion from any suitable source. The spindle is arranged to slide vertically to accommodate different thicknesses of lenses, and its lower end is supported on one end of a lever 70, to which a treadle (not shown) is connected, so that-the operator can conveniently control the position of the lens.
The upper ends of uprights c are braced by cross-bars a The operation is as follows: The roughlyformed lens is cemented to the support 72. and the latter fastened in the chuck, and then the spindle is set to revolving. The frame 6 is moved back and forth, and the lens raised into contact with the grinding-disk. The horizontal guideways g control the traverse of the frame, while the disks 0' keep the frames pivot at one central point, which is in a line at right angles to the guideway g. The result is a paraboloidal surface on the lens, the
ICO
grinding-disk being always in a plane tangent to a parabola whose focus-line embraces the center of oscillation of said disk.
Grinding and polishing materials of ditferent degrees of fineness are successively used until the lens is completely polished.
By turning the milled heads d the blocks 0 can beset at any focus required, the verniers enabling the operator to read the distance from the tangent slideways g to about one one-thousandth of an inch.
The swinging frame is here shown as provided with a ball at and a handle m, by which to operate it.
It is evident that the invention is capable of embodiment in other forms than that here shown.
What I claim as new is as follows:
1. In an apparatus forgrinding curved surfaces, the combination of an oscillatory holder having a sliding engagement with its pivot, and agnide-Way engaging said holder and extending tangentially with respect to a circle described by the holder in oscillation about its pivot.
2. In an apparatus for forming paraboloidal surfaces the combination of a suitably constructed supporting frame having vertical slide-ways, slides fitting the same and carrying pivots, adjustment screws supporting said, slides, a carrier or holder having sliding connection with said pivots, and horizontal guide- Ways receiving projections on the carrier.
8. In an apparatus for forming paraboloidal surfaces the construction of a suitably constructed supporting frame having vertical slide-ways, slides fitted to the same, adjusting screws engaging the slides, disks pivoted to said slides, a frame having pendent arms extending at right angles to it and having a sliding engagement with said pivoted disks, horizontal slide-Ways on the supporting-frame and receiving projections on the pivoted frame, and a vertical spindle centrally located in the supporting-frame.
In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 28th day of June, A. D. 189%.
THEOD ORE M. CLARK.
\Vitnesses:
HORACE BROWN, FRANK PARKER DAVIS.
US547138D Apparatus for forming curved surfaces Expired - Lifetime US547138A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435126A (en) * 1945-03-19 1948-01-27 Vickers Electrical Co Ltd Formation of curved surfaces of prescribed figure by grinding and/or polishing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435126A (en) * 1945-03-19 1948-01-27 Vickers Electrical Co Ltd Formation of curved surfaces of prescribed figure by grinding and/or polishing

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