US1287479A - Astigmatic-lens-grinding mechanism. - Google Patents

Description

LI 6. SIMPSON. ASTIGMATIC LENS GRINDING MECHANISM.

APPLICATION FILED AUGJ, I9I6.

Patented Dec. 10, I918.

ITEIR 5 VI E N. i R rm M N m B O 2 a m the abrasive used in g,

i Rec. ester, in fine c0 my 0 abrading and abraded surfaces and LEON emieecn, 0e

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T0 025 wiwm 5e mag; causes" 381$ lincwn citizen me New Yam, have invented Grinding Mechanism; and A fcllowing 5:0: be a full, cleai', exact dese *iption 0:? the same, reference being had. in the accompanying drawings, fez-wing" a pare of this specification, and to the erect/e .S 0% xeference marked thereon.

My invention relates to grinding me chines and more perticulerlv relates to a grinding mechanism especial, ly edeptecl 5502 rinding astigmatic lenses, time is, lenses living their two meridians 0f curvature, such as, cylinder lenses, eerie lenses and prisms.

Salient objects of this invention are: To provide an imprcvecl lens grinding mechanism of the iype 5511M einbcziies means v cunnecting a grinding shell and lens moms..-

ed on e lens lonely together eriler t0 serve the relaeive angular EQlfii'iS-R ilae time maintain their mericlizmal alinexwent Wherein those parts which may obstruct 1e sur feces under abrasion, end crelineciiy we in E lie way of the operate? when he emlezzvur; to apply abrasive material thereto, have bee reduced 9.- minimum;

To provide a lens grinding mechanism a this cliei'ectei, that is s0 organized u, may be readily attache. to endmie eclled from crdinary forms of lens grinii chines in use today;

To "ovicle an improved ceniiecti tween he suppoi'nng d mg meme-- nism and the grimling imple;

T0 provide a imiing in m wherein all. nwving p p2 tectecl mm cling and nclisr the drawings:

Fi we 1 is a right elevei ion gi'in ing machine to which a lens gum mechanism constituting an embodiment of my inventicn has been ii plied, she bowl .of the machine having been bfoizen avvay 959 more fully xiisciose the or; my mventien.

from llie s is jcurnel driven by a mechanism ale such :23 ia jing 211 n gaged by a lens body spindle, and thus when the support .is rotated and the lens body, which being carried by the grinding shell and driven by the link in the same general direction as the shell, is held with its axis of rotation eccentric to the axis of rotation of the shell or, what is preferable, when the lens body is moved back and forth across the grinding shell, which may be done by swinging the lens body spindle laterally: a differential movement of the grinding shell and the lens body is produced which sets up a grinding action between the grinding shell and the lens without disturbing the meridianal alinement of the two. i

To this end I provide a grinding head 10 which is provided in its under side with a concentric taper socket 11, adapted to fit on the tapered upper end of the grinding spindle 1. On the upper end of the head 10, I provide a tapered shank 12 which is designed to receive a grinding shell 13, which we will presume is a tor-ie grinding shell having a 6.00 diopter curve in one meridian and a 6.75 curve in the other meridian. The shank 12 on the grinding head and the socket 14 of the grinding shell 13 are preterably made the same in size and taper as the grinding spindle 1 and the socket 11. As an additional precaution against the possibility of relative angular movement between the grinding shell 13 and the shank 12, a projecting pin 15 is provided in the shank 12 in position to engage with the slot 16 which slot is formed as shown, in the hub of each of the grinding shells that are to be used on the, shank 12. By using a single pin 15 and slot .16 each grinding shell will always set upon the spindle 1 in the same position.

For linking the lens body to the head 10 in such a manner that when a lens is blocked thereon and the lens body is arranged in cooperative relation with a grinding shell mounted on the grinding head, the two grinding implements, namely the grinding shell and the lens body with its lens, may be maintained in meridianal alinement whether they are actuated or not, that is to say for example, that when the grinding shell rotates for a given angular distance about its axis, the lens body must. rotate for exactly the same angular distance in the same general direction about its axis; and yet to allow universal tilting movement of the lens body or carrier about its connection i I to the grinding head: I provide a rigid lmk connected at one end through a universal connection to the head 10 and at the other end through a universal coupling to the lens body.

The universal conncetioi'i at the lower end comprises a. bifurcated yoke member consisting of a shank 20 provided with a pair of yoke arms 21, and in the extremity of each of these arms, is threaded one of a pairof studs 22, each having an inwardly extending portion upon which is mounted a roller 23. The rollers 23 cooperate with a pair of diametrically opposite elongated slots or recesses 24 cut into the sides of the ball shaped body of the head 10, and extending in the direction of its axis of rotation. This connection permits the shank 20 to be raised or lowered, swung about the axis of the rollers 23, toward and away from the vertical axis of the head 10 and to be swung laterally about an axis intermediate and at right angles to the axis of the rollers; but it will not permit of any rotative movement of the shank 20 about the vertical axisv of the head 10. The shank 25 of the arm 26, which forms the upper portion of the link connectin the head 10 with the lens body 30, is adjusta 1y secured to the shank 20 of the yoke portion of the link by means of a pair of screws 27 passing through slots 28 in the shank 25 and threaded into the shank 20 of the yoke member. To further insure the rigidity of the link and to hold the parts in alinement the shank 25 and the shank 20 are joined. together by a tongue and groove connection as best shown in Fig. 2. The screws 27 serve. to hold the two parts of the link rigidly together after the desired adjustment for length has been made.

The free end of the arm 20 forming the upper portion of the link is enlarged to acconnnodate the removable hardened steel coupling member 31 which is preferably threaded therein and is adapted to cooperate simultaneously with the lower end of the. lens body spindle 2 and with the lens body 30. forming a universal coupling for guiding and operating the lens body and at the same time constraining the motion of the link.

In the upper portion of the coupling member is formed a center 32 in the form of a spherical or conical recess in which the end of the spindle sets and the lower portion of the coupling member is formed into a ball end having a transverse slot out therethrough as best shown in Figs. 1 and 2. A socket. preferably a spherical bottomed socket having a removable pin 36 extending diametrically across its center of curvature, is provided in the lens body 30, and engages with the split ball 33 in the manner of a clutch or coupling, the end of the ball seating in the bottom of the socket and the pin passing through the slot in the ball. The wall 37 surrounds the socket 35 and extends upwardly for a sutiicient height to prevent al 'asive material from accidentally getting into the bearing, and oil from being thrown out of, the socket. This forms a universal coupling for detachabl y connecting the drivinglink with the lens body.

i alient features peculiar to the construction at the universal coupling and the adja win-(11y toward a common drip point located Joint to the second grinding implement and below said implements and connecting attached at another point to the support means, whereby fluid material may collect through universal connecting means, the I at and drip off of, said dri point. portions of the link extending away from LEON SIMPSON. the grinding implements and away from the connecting means each being directed d0wn- Witnesses:

WILLIAM G. Woonwon'rn, GEORGE A. PA E.

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