US1222559A - Drill. - Google Patents

Description

.I. MOFFITT.

DRILL.

APPLICATION FILED JAN. 9, 19:5.

1222,5590 Patented Apr. 10, 191?.

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-J. MOFFITT.

DRILL.

APPLICATION FILED JAN.9. 1915.

"MI mwm U lz/illllfl/ll Patented Apr. 10, 1917.

2 SHEETS-SHEET 2 WITNESSES: 4Z%% cally positioning pisrrnn srarns rarnnir opinion JEREMIAH IVIOFFITT, OF SOUTHBRIDGE, MASSACHUSETTS, ASSIGNGR T0 AMERICAN OPTICAL COMPANY, OF SOUTHBRIDGE, I /IASSAGHUSETTS, A VOLUNTARY ASSOCIA- TION OF MASSACHUSETTS.

DRILL.

Specification of Letters Patent.

Patented Apr. Ill 1917.

Application filed January 9, 1915. Serial No. 1,437.

To allv whom it may concern:

Be it known that I, JEREMIAH h lorrlr'r, a citizen of th United States, residing at Southbridge, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Drills, of which the following is a specification.

This invention relates to improvements in drills and has particular reference to an improved machine for use in the drilling of ophthalmic lenses or the like.

The leading object of the present invention is the provision of an improved drill for ophthalmic lenses in which all desired adjustments may be made of the position of the lens and which shall embody improved lens holding and lens positioning means, and in which at the same time all of the parts shall be of the most simple and durable con str'uction which will permit of the attainment of the desired result.

Among other specific objects of the present invention may be mentioned the provision of an improv d device for automatithe lens to insure the proper supporting of the same immediately beneath the point of the drill operating thereon; the provision of improved mechanism for operating the lens centering and clamping device and for operating the frame control whereby the various parts may be readily positioned with one hand; the provision of improved means for feeding nielange or drilling fluid to the point of the lens to be operated upon; and in general the simplification and perfectipn of the mechanism of ophthalmic lens drills.

Further objects and advantages of this improved construction should be readily apparent by reference to the following specification taken in connection with the accompanying drawings forming a part thereof, and it will be understood that may make any modifications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of this invention.

Figure I represents a perspective view of a drill, the usual parts of the construction being shown in ghost-line.

Fig. II represents an enlarged detail view of the lens holding and positioning means.

Fig. III represents a fragmentary view partially in section illustrating the means for locking the standard of the lens carriage or holder in position.

Fig. IV represents a sectional view with the parts illustrated in Fig. II moved into position for drilling of the lens.

Fig. V represents a fragmentary sectional view of the outer portion of the lens supporting arm and standard illustrating certain details of construction thereof.

Fig. VI represents an end view of the im proved drill.

Fig. VII represents a sectional view as on the line VII-VII of Fig. VI.

Fig. VIII represents a detail view of a modified form of melange tank removed.

Fig. IX represents a sectional view of the means for locking the lens holder in angularly adjusted position, and

Fig. 1 represents a top plan view par tially in elevation and partially in section of the lens centering and clamping mechanism.

In the drawings, in which similar charactors of reference are employed to denote corresponding parts throughout the several views, the numeral 1 designates the base of the drill provided with a peripheral upstanding tlange 2 to form a tank and prevent spreading of any melange onto the work table. Rising from the base 1 at the rear and near one corner thereof is the standard 3 having the journal bearing 41: for the drill spindle 5 and the slide bearing 6 in which moves the sleeve 7 providing a second bearing for the said drill spindle. A handle 8 pivoted to the standard 3 and having a yoke 9 engaging the sleeve 7 serves to impart reciprocating movement to the sleeve and thus to the drill spindle, a spring normally nolding the parts in raised position, as shown in I, while to actuate the spindle 5 there is secured thereon the pulley 10, adapted to receive a belt which may if desired be further passed over the idlers 11 and. 12, which are supported by the bracket 13.

Attention is invited to the fact that the bracket 13' is so secured to the upper end of the standard that it may be located in either of two positions. One of these positions is indicated in Fig. l, as where it is desired to belt to the drill from over head, while the opposite position is illustrated in Fig. VI, as where it is desired to belt to the drill from beneath the bench.

Rising from the base 1 adjacent the standard is a tubular lug 1%, which preferably projects above the top of the flange 2 and has mounted therein the guide 15, on which is mounted the sleeve 16 having the depending peripheral flange 17 interlocking with the lug 1st to form a shield divert-ing melange from the lug and having at its upper end the pivot-bearing block 18 engaging the upper end of the guide 15 whereby the sleeve 16 is supported for free rotative movement around the guide 15 and lug 1 1.

Secured to the flange 17 is a blade spring 19 bearing at its upper end the stop block 20 adapted to engage the edge of a lens, said blade extending through the guide slot or groove 21 of the lug 22 at the upper portion of the sleeve 16 and a thumb screw 23 serving to bring the blade inward to hold the stop block 20 at any desired position relative to the cone point 24; which is located at the upper end of the sleeve and in axial alinement with the point of the drill 25, and serves when in use to support the inner end of the lens during the drilling operation.

Rising from the opposite end from that at which the standard 3 is located, is the large lug 26 centrally bored to receive and rotatively engage the cylindrical base 27 of the lens carriage standard 28 which projects downward through the portion 26 and is retained in position by the countersunk washer 29 secured in position by the screw 30 and locked to rotate with the standard 28 b the pin or pins 31, as is clearly illustrated in Fig. V.

Mounted on the portion 27 and resting on top of the lug 26 is the indicating or scale ring 32 locked in desired adjusted position either by dowels, or, as is shown in Fig. V, by a set screw or set screws 33, so arranged that the ring 32 may be set in any desired position and there secured. This permits of adjustment of the ring to compensate for any wear in the parts of the machine.

The upper portion of the standard 28 is eccentrically bored to receive the spindle 31 of the swinging lens carriage. Said carriage comprises the section from which the spindle 3% depends, and the angularly adjustable section 36 bearing the lens holding and clamping mechanism.

In the drilling of ophthalmic lenses it is frequently desirable that the same be drilled to one side or the other of their longer geometrical axis in place of directly on the axis, and it is for this reason that the spindle 34: is eccentrically located relative to the axis of rotation of the standard 27 hen it is desired to drill a lens to one side or the other of what is usually termed the center or longer geometrical axis, it is merely necessary to press downward on the latch 37 to release the standard 28, when grasping base 1, preferably at the,

of the handle 38 facilitates rotation of the standard to bring the pointer or guide designation 39 in alinement with the proper eonliguration 10 on the scale ring This movement serves to vary the center of pivotance of the lens supporting carriage by moving it either inward or outward, as will be readily apparent, and this will consequently vary the position of the lens relative to the drill the amount indicated by the configuration 10.

In the drilling of the lens, however, it is desirable to determine not only the position at which the drilling operation will take place, but also to have the lens so'mount-ed that the drilling will be normal to the surface of the lens irrespective of its curvature. It is to accomplish this result that the carriage section 36 is pivotally mounted, the axis of the pivotal movement of the carriage for angular adjustment of the lens passing substantially through the point at which the drill will engage the surface of the lens so that adjustment of the lens to the correct angle will in nowise vary the portion of the lens to be engaged by the drill.

Various means may be employed for securing the carriage in desired angularly justed position, one form being illustrated inFig. V and a second form in Fig. 1X, these being capable of either joint or separate use.

Referring particularly to Fig. V, 1 have shown the carriage 36 as provided with the spindle n passing through the carriage section 35 and having a reduced end 12 around which is coiled the compression spring e3 bearing against the interior shoulder 14: of the carriage section 35 and having its outer end bearing against the washer 15 which is secured to the end of the spindle 4:1 as by the screw 16, the washer being locked to retate with the spindle 11 as by the pin l7. It will thus be seen that the action of the compression spring on the washer -15 serves to draw the contacting faces as and 4:9 of the two carriage sections into tight frictional engagement, which will permit of relative angular adjustment of the parts against said friction, the friction, however, being sufficient to retain the parts against any accidental relative movement.

If preferred, however, in place of or in addition to this friction, I may mount within one of the sections, as in the slot 50 of the carriage section 36, the latch member 51 actuated by the spring 52 to swing the latch portion 53 thereof into one of the notches 5 1 in the face 18 of the carriage section 35, a plurality of these notches being formed in said face 48 so that the section 36 may be secured in any desired position within practical limits.

To retain and properly center the lens on the swinging carriage, various mecha- '1 317 new nisms may be employed. 1 have here illus trated, however, a preferred mechanism for this purpose, in which there is secured to the carriage section 36 the plate or table 55 having the guide rib 56 thereon, in which is formed a slot 57 for the screw 58 which serves to retain in position on the table 55 the clamp slide 59, while permitting of sliding movement thereof, which movement is limited by the engagement of the screw 58 with the ends of the slot 57. The table has the forward portion thereof centrally cut away, as indicated in Fig. X, and bears at its forward end the lens engaging pins 60 provided intermediate the length thereof with the shoulder 61 to engage the under surface of the lens, the slide being provided with a pair of shorter "pins 62 for engaging the sides of the lens at the opposite end thereof, as is clearly indicated in Figs. TI and TV. The slide itself may either be grasped by the hand and rearwardly shifted against the tension of the spring or springs 63, as is indicated in Fig. I, or may be provided at one side with the rack 64 engaged by the sector 65 on the pivoted lever 66, so disposed that the end of the lever may be engaged by the thumb when the hand is grasping the carriage section 36, pressure of the thumb serving to move the slide outwardly to permit of correct positioning of a lens between the pins 60 and 62.

By reference particularly to Figs. 11 and TV, one of the great advantages of my improved work holder and work supporting pin will be readily apparent, and it will be noted that when a lens is placed in position between the pins 60 and 62 with its inner end resting on the shoulder 61, that said shoulder serves to hold the end of the lens in. alinement with the conical work support 24 but beneath the point of the cone. Inward swinging of the carriage on the spindle 3% as a pivot will serve to press the end of the lens against the inclined surface of the cone, when the lens will ride up off the shoulder 61 and in final position will have its end against the strap block 20 and will be firmly and securely supported by the point of the cone 24: immediately beneath the place to be drilled, which thus provides a firm rest and base for the lens.

The advantage of this construction should be at once apparent since it will be seen that irrespective of the shape or curvature of the lens whether the same be concave or convex, in place of its being necessary to specifically adjust a number of parts to secure the correct supporting of the lens beneath the pivotal point to relieve the lens of strain and prevent breaking thereof, it is merely necessary to clamp the lens in position on the bed 55 preferably swinging the carriage section 36 to get approximately the desired move the angle for the lens and to then on the point of the cone,

1 and Fig. VII, the valve point inward around the pivot till the lens is against the strap 20, when in all instances the cone will serve to raise the lens out of engagement with the shoulder 61 so that the lens will be securely supported while at the same time held properly centered by the engagement of the pins 60 and 62 with the thereof.

In the drilling of lenses it is necessary to make use of a drilling fluid usually termed melange. In some instances persons prefer an automatic melange feed, while in other instances it is desired to have a manually operated and controlled melange feed. To take care of the varying require ments of different users of my machine I have, therefore, designed interchangeable manual and automatically operable melange feeding devices. Said devices comprise a cylindrical drawn or cupped up tank 67 having secured at one side thereof the interiorly threaded sleeve 68, adapted to lit into a recess or socket in the-portion 6 of the drill and be there suitably secured by a bolt or the like. This tank in both the manual and automatically operable form, has passing through the bottom thereof the bushing 69 interiorly threaded to receive the threaded lower end of the tube 70, in which is slidably mounted the valve pin 71 having the tapered valve 72 at its lower end, from which depends the guide wire 73 for the melange, and having intermediately thereof the abutment shoulder 74. The compression spring 75 surrounds the valve pin 71 and has one end resting on the shoulderie and the other end bearing against the pin 76 driven through the valve stem and riding in the slot 77 at the upper end of the tube. A tap '78 forms a closure for the upper end of the tube and a guide for the valve rod which extends thereabove.

In the automatic form illustrated in Fig.

stem projects up- 'ardly sufficiently to engage the abutment 79 carried by the arm 9 of the handle 8, whereby the handle 8 serves to temporarily depress the valve stem 71, which then springs past the abutment 79 to allow the valve to close before the drill comes into engagement with the work, a portion of melange flowing through the aperture 80 at the base of the tube 70 down around the valve 72 and being guided into correct position on. the work by means of the wire 73.

In the manually operable form of con struction the parts are substantially the same, with the exception that the tap 78 has rising therefrom the ear or cars 81 between which are pivoted one end of the bell crank 82 which depends over the front of the tank whereby slight pressure against the end of the bell crank serves to depress the valve stem and open the valve,

the spring serving to close the valve and stop the flow of melange as soon as the pressure is removed from the bell crank lever 82.

From the foregoing description taken in connection with the accompanying drawings the construction of my improved drill should be readily apparent. Briefly stated, the operation may be considered as follows: When it is desired to drill a lens it is first determined whether the lens is to be drilled above or below center and the distance from the edge of the lens at which the hole is to be drilled. The screw is then turned to bring the block 20 in correct position according to the distance from the edge at which the hole is to be drilled, while the latch 37 is depressed and the standard 28 rotated to correct position to drill the lens on, above, or below center, as may be de sired. The carriage 36 is then grasped with the left hand, the lens if desired also being grasped by said hand. The lens being suitably held as with one end resting on the shoulder 61 of the pin 60 and the small and third fingers of the hand resting on the carriage 36 with the other fingers holding the lens, the thumb is then pressed against the lever 66 to open up the slide to such position that the lens will fit between the pins 60 and G2, the lens being then pressed downward into position, and the central portion of the slide being hollowed as at 83 to accommodate strong convex surfaces. The swinging carriage now being held by the left hand, it is merely necessary to either angularly adjust the same against the friction of the spring 43 or to engage the outer end of the latch 51 with one of the fingers to release the latch till the carriage is swung into desired position.

The carriage 36 is then swung inward, the lens sliding upward on the cone point at and if desired being steadied by the forefinger to properly hold the same down onto the point of the cone. Grasping of the handle 8 by the right hand then serves to move the drill 25 downward toward the lens. Melange may be placed on the point of the lens to be drilled either by pressure of the thumb of the left hand on the bell crank 82, in the case of the manually operated melange feed, or by engagement of the abutment (9 with the upper end of the valve stem as the drill. is depressed, in the case of the automatic feed, in either event a portion of the melange being released flowing down along the wire 73 to the lens. It is then merely necessary to supply suitable pressure to the rotating drill through the medium of the handle 8 until the lens is drilled part way through, when the same may be turned over and the drilling operation completed.

I claim:

1. In a machine of the character detion of the lens in the holder,

scribed, the combination with a lens holder, of a lens positioning pin having a conical surface projecting above the normal posiwhereby when the holder is moved toward the pin the lens will ride upward on said conical surface and be correctly supported in operative position on the apex of said cone.

2. In a machine of the character de scribed, the combination with a base and a drill carried thereby, of a work supporting post disposed in axial alinement with the drill and having. an inclined front surface, a work holder movable toward said post, lens rests on the holder at a point lower than the upper edge of the inclined surface,

said means allowing relative upward movement of the lens, whereby when the holder is moved inwardly the inclined surface will cam the lens upward into position to rest on the highest point thereof, substantially as and for the purpose described.

' 3. In a machine of the character described, the combination with a base and a drill supported thereby, of a work support mounted for rotative movement about the axis of the drill, an adjustable stop carried by the support for engaging the edge of the lens, a lens holder mounted for swinging movement toward and away from the work support, and means for laterally shifting the swinging lens holder, of the work support and stop permitting the same to automatically accommodate itself to the edge of the work or lens irrespective of the lateral adjustment of the latter.

4. In a machine of the character described, the combination with a base and a drill supported thereby, of a lenscarriage standard rising from the base, a lens carriage pivotally engaging the standard and provided with a work supporting bed, lens retaining pins rising from the bed and provided with shoulders on which a lens may rest, a clamp slide mounted on the bed, means for forcin the slide into operative position, and rack and sector mechanism for shifting the clamp slide into inoperative position.

5. In a lens drill, the combination with a base and a drill support carried thereby, of a drill carried by the support, a pivotally mounted standard rising from the support,

means for locking the standard in desired i rotatably adjusted position, and a lens car riage pivotally mounted on thestandard eccentric to the axis thereof, whereby rotation of the standard serves to laterally shift the carriage to regulate the operative position of the drill relative to the major geometric axis of the lens operated on thereby.

6. A lens drill, including a lens carriage standard, a sectional carriage supported by the standard, means connecting the sections the pivotal mounting serves to laterally shift of the carriage for relative pivotal movement to adjust the angular position of the lens, and a resilient latch carried by one of the members of the carriage and adapted to engage in one of a plurality of keepers in the other member for securing the parts in desired relatively adjusted position.

7. In a lens drill, the combination with a base and drill support carried thereby, of a standard rotatably supported by the base, means for locking the standard in desired rotatively adjusted position, a carriage section eccentrically pivoted on the standard whereby rotation of the main standard the carriage section, a lens carriage pivotally secured to the carriage section and laterally adjustable therewith, and means for locking the carriage in desired angularly adjusted position.

8. In a lens drill, the combination with a base and drill support carried thereby, of a lens carriage standard rising from the base, a lens carriage pivotally secured to the; standard, and means for holding the carriage and standard in frictional engagement one with the other to resist accidental relative pivotal movement of said parts.

9. In a lens drill, the combination with a base having a socket formed therein, of a standard having a portion rotatably mounted within the socket, a vernier collar e11circling the standard and keyed to the base, means on the standard for cooperation with the Vernier to indicate the several adjustments of the standard, and means carried by the base and engaging the standard for locking the standard in desired rotatively adjusted position.

10. In a lens drill, the combination with a base, of a drill standard and a lens carriage standard rising therefrom, a lens carriage supported by the lens carriage standard, a lens clamp slide mounted on the carriage, and a thumb piece pivoted to the carriage and engaging the slide for shifting the slide into inoperative position upon pressure on the outer end of the thumb piece.

11. In a lens drill, the combination with a base, of a standard rising therefrom, a lens carriage pivotally secured to the standard and bearing a lens clamp slide, a latch member for controlling the relative adjustment of the carriage and standard, and an operating lever for controlling the movement of the clamp slide, said parts being disposed at opposite ends of the carriage, whereby they may be simultaneously operated by natural grasping of the carriage with the hand or may be independently operated as desired.

12. In a lens drill, the combination with a base, of a standard rising therefrom, a lens carriage pivotally secured to the standard and bearing a lens clamp slide, a latch memher for controlling the relative adjustment of the carriage and standard, and an operating lever for controlling the movement of the clamp slide, said parts being disposed at opposite ends of the carriage, whereby they may be simultaneously operated by natural grasping of the carriage with the hand or may be independently operated as desired, the said pivotal movement of the carriage serving to vary the angular position of the lens, and means for laterally shifting the standard and carriage to vary the horizontal position of the lens with respect to the drill.

13. In a lens drill, the combination with a base and a drill standard rising therefrom, of a lens carriage supported by the base for movement toward and away from the drill holder, a lens supporting pin disposed in advance of the drill holder and provided with an upwardly inclining forward face, and lens positioning pins on the lens carriage having lens receiving shoulders on which the lens will normally rest, the shoulders on the pins adjacent the lens support being lower than the top of the support, and the shoulders on the distal pins being substantially the same height as the support when the carriage is in horizontal position, whereby as the lens carriage is moved in the direction of the support the inclined front face of the support will cam the lens up- Ward oil the lower shoulders to be supported in substantially horizontal position on the top of the lens support, and the distance shoulders while held centered on the carriage by continued lateral engagement of the pins with the edge of the lens.

14. In a lens drill, the combination with a base having a drill standard and a conical pointed lens support rising therefrom, of a lens carriage, a pivotally supported arm for supporting said carriage, means for laterally shifting the point of pivotance of the arm to laterally adjust the lens carriage relative to the conical lens support, and lens centering pins carried by and projecting upwardly from the lens carriage, said pins having shoulders for initially supporting the lens at a point below the top of the conical lens support, whereby as the carriage is swung toward the conical support on its pivot the support will cam the lens upwardly 0d the supporting shoulders to rest firmly on the point during the drilling operation, substantially as and for the purpose described.

In testimony whereof I aflix my signature in presence of two witnesses.

JERRY MOFFIT'I.

Witnesses:

HARRY H. STYLL, C. FRED HILL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. 0.

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