US874507A - Lens-drilling machine. - Google Patents

Description

PATENTED DEC. 24, 1907 Z. P. HIGHSMITH.

LENS DRILLING MAGHINE.

APPLICATION FILED APR. '1. 190B.

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" PATENTED DEC. 24, 190 7.

I Z. P. HIGHSMITH. LENS DRILLING MACHINE.

' APPLIGATION FILED APR. 7. 1906.

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F m I [NVENTOR B I W Noj 874,507 A PATENTED DEC. 24. 1907.

' Z. P. HIGHSMITH.

LENS DRILLING MACHINE.

APPLICATION FILED APR. 7. 1906.

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ZNVEA OR W1 TNESSES:

4EBULON F. HIGHSMITH, OF SUMTER, SOUTH CAROLINA.

LENS-DRILLING MACHINE Specification of Letters Patent.

Patented Dec. 24, 1907.

Application filed April 7. 1906. Serial No- 310,469.

To all whom it may concern:

Be it known that I, ZEBULON F. HIGH- SMITH, a citizen of the United States, residing at Sumter, in the county of Sumter and State of South Carolina, have invented new and useful Im rovements in Lens-Drilling Machines, of W ich the following is a specification.

This invention is a lens-drilling machine, and has for its object to provide a machine of this kind in which the drill is given a gymtory motion, together with other novel features of construction hereinafter described and claimed, whereby more rapid and accurate work can be done.

In the accompanying drawings :Figure 1 is an elevation of the invention; Fig. 2 is a central vertical section; Fig. 3 is a horizontal section on the line 33 of Fig. 1; Fig. 4 is an elevation of a modification; Figs. 5 and 6 are sectional views of the lens illustrating the action of the drill; Fig. 7 is a vertical section on the line 7-7 of Fig. 3; Fig. 8 is a vertical section on the'line 88 of Fig. 4.

Referring specifically to the drawings, 10 denotes the base of the machine from which rises astandard 11 having forwardly pro- .jecting arms 12 and 13, respectively. In

suitable bearings in the base and the arms, is journaled a'vertical shaft 14 to which is fixed near its lower end a pinion 15 which meshes with a gear-wheel 16 mounted on the base by means of a pivot-stud 17 extending into a bearing-socket in the top of the base. Locatedgeccentrically on the gear 16 is a short socketed stud 1'8.

The lens-holder com rises a flat plate 20 having on to a pair 0 upwardly-extending ins 21 whic serve as clamping-abutments, eing engaged by the edge of the lens, and against which the lens is clamped by a spring-pressed plate 22, which is curved to corres 0nd to the perimeter of the lens. The ate 22 is carried at one end of a stem 23 shdably mounted in the upstanding arms 24 ofga U-shaped support pivoted at 24" to the plate 20. A spring 25 is fastened to the stem 23 and to the rear arm 24, said spring serving to push the plate 22 forwardly to securely clamp the lens against the pins 21 and hold it 1n position. projecting finger-piece 26 for manipulating the clamping late, and also to act as a stop to limit the orward movement thereof by the engagement of said finger-piece with the in the arms 12 and 13.

The stem 23 has a front arm 24. On the bottom of the plate 20 are downwardly-projecting pins 27 and 28, respectively, the former extending into a guide-slot 29 in a bracket 30 secured to the base 10, and the latter into the socket in the stud 18. Between the pins 21 a small hole 31 is made in the'plate to receive the drillpoint.

At 32 is indicated a vertically-extending sleeve which is mounted in suitable bearings Through this sleeve extends a spindle 33 carrying at its lower end a jointed drill- spindle comprising sections 34 and 35, respectively, which are connected by a universal joint 36. The section 34 has a socket into which the spindle 33 extends and to which it is fastened by a pin 37. The section 35 carries the drill 38.

The drill is raised and lowered during the drilling o eration by a forked lever 39 pivoted to t e standard 11 and connected to a sliding collar 40 on the sleeve 32, said collar working between fixed collars 41 on the spectively, which are connected to any desired source of power by suitable belts. In order that the machine may be operated by hand, a gear-wheel 46 fixed to the shaft 14 and meshing with a pinion 47 on the spindle 33 is provided. The wheel 46 has an operating handle 48. The machine can be driven by belts to both pulleys in which event the gears 46 and 47 may be removed. If desired a belt can be run to eitherbne of the pulleys only, but then the gears 46 and 47 must remain in order that the spindle 33 and the shaft 14 may both be driven.

In the operation of the machine the lens is placed on the holder and clamped thereto as already described. The lens will be placed so that the point at which the hole is to be drilled will be directly over-the hole 31.

shown in Fig. 6.

volved in a horizontal plane, its opposite end being guided by the pin 27 working back and forth in the slot 29. The hole 31 is directly over the pin 28 so that it revolves about an axis which is the center of the gear 16. This gear and the drill are in axial alinement when the latter is raised, but when it is lowered into operative position it is presented to the lens at an inclination as the hole 31 is off the center of the gear. The revolution of the lens-holder imparts a gyratory motion to the drill so that a tapering hole is drilled in the lens as shown in Fig. 5. The lens is then reversedand drilled from the opposite side, resulting in a hole which tapers inwardly from opposite sides from the lens as This method of drilling a lens is speedy and accurate, because the hole is drilled entirely through the lens the first time, so that when the lens is reversed to be drilled from the other side, the drill-point can be properly placed at once.

A further advantage of this machine is that a diamond drill-point is not required. Such points are expensive and subject to breakage, and besides require occasional sharpening by an expert. With the machine herein described. a steel drill may be used which is cheap and can be readily shar ened, and is not so easily broken.\- The mac line drills a hole faster and while running slower than an ordinary machine in which a diamond-drill is used.

,The machine can also be used for ordinary drilling as it can be readily fitted with a rigid drill-spindle, and work-holder.

To prevent the spindle-section 35 from flying outwardly and striking the standard 11 when the drill is raised, a guard is provided comprising a wire 49 which is fastened to the arm 13 and formed with a loop 50 through which said spindle-section extends.

The loop is sufficiently large topermit the drill movement heretofore described.

In Fig. 4 is shown a machine which is in all res ects similar. to the one herein describe with the exceptions-hereafter noted. This machine accomplishes the same result as the one first described, but in a different manner. The pinion 15 is removed, and the lens-holder is made stationary by inserting the pin 28' into a central socket 51 in the gear 16, the pin 27 being placed in the slot 29 as before. The spindle- sections 34 and 35 are also removed and the attachment designated as a whole at 52 is substituted therefor. The attachment referred to comprises a disk 53 having in its rim a groove 54 forming a pulley to receive a driving belt, and below said groove the disk is formed with gear teeth 55 which mesh with a pinion 56 on the shaft 14. The disk 53 is fastened to the sleeve 32 below the arm 13 by a set-screw 57 or other suitable means. A: jointed drillspindle such as the one heretofore described is also employed. The upper spindle-section extends loosely through an opening 58 in the disk 53, and below said. disk a pinion 59 is fast on said spindle-section. The spindle 33 extends through the sleeve 32 as before, and projects below the disk 53, and to said pro jecting end is made fast a pinion 60 which meshes with the pinion 59. A strap 61 fastened to and extending from the bottom. of the disk under the pinion 59 serves as a support for the upper spindle-section which extends loosely through the opening 58 so as to be free to rotate. The drill is carried by the lower spindle-section as before.

In the operation of this machine the upper spindle-section is rotated on its own axis through the gears 59 and 60 by the rotation of the spindle 33; and as the upper spindle section is mounted. in the disk which is fast on the sleeve 32, said spindle-section will, when the sleeve is rotated, also revolve on an axis which is the center of the sleeve. As a result of this compound movement of the spindle-section a gyratory motion is imparted to the drill so that a tapering hole as heretofore described will be made in the lens. The lens will also be reversed and drilled from the other side as before, resulting in a hole as shownin Fig. 6.

In both forms of machine herein described the path described by the lower spindle-section 35 and the drill 38 generates a-cone. In the first case the a )ex of the cone is at the joint 36, and in the ast case it is at the point of the drill, but the resulting hole drilled in the lens is the same.

The machine shown in Fig. 4 is driven by a belt to the pulleys 54, 45 or 44. It can also be driven by hand, the gears 46 and 47 driving the spindle 33, and the gear 56 driving the disk 53.

The sleeve 32 in the form of machine shown in Figs. 1 and 2 may be left off if desired. In this case the lever 39 is fitted directly to the spindle 33. The bracket carrying the clamping late 22 is pivoted to the work-holder in order that the lens may be adjusted'for drilling on either side of its ma or ax1s.

It will be seen that in both of the forms shown and described the holder does not rotate with respect to the axis of the drill spin dle, although it revolves with respect thereto.

- In the form shown in Fig. 1 the holder oscillates and reciprocates, in consequence of the eccentric movement of its inner end and the slight back and forth movement of its outer end, but the angle at which the work is held, with respect to the axis of the drill, does not vary, except such variation as may be incident to the oscillation of the holder. In the K form shown in Fig. 4, the angle of the holder spect to the axis of the drill. Such rotation, as may be understood, would prevent proper cutting action of the drill.

I claim 1. In a drilling machine, in combination, a drill spindle formed in sections with a universal joint therebetween, means for rotating the spindle, a holder for the work upon which the drill operates, and means for revolving the holder without substantially varying the relative angle of any line passing through the holder with respect to the axis of thedrill.

2. In a drilling machine, in combination, a drill spindle formed of upper and lower sections with a universal joint therebetween, a work holder under the drill, and means to relatively revolve the work holder and 11 per spindle section with respect to each ot er, without rotating the work holder with respect to the axis of the drill.

3. In a drilling machine, in combination, a sectional drill spindle having a universal joint between the sections, a revoluble work holder opposite the drill, for revolving the work and revolving the spindle section carrying the drill around the axis of the other spindle section, and means to prevent rotation of the work holder.

4. In a drilling machine, in combination, a base, a wheel mounted on the base, a revolv- 7. La an. :55 l

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revolved b ing work holder supported eccentrically and the wheel, means to revent rotation of t e holder, a sectional rill spindle opposite the work holder, and gearing be tween the wheel and the spindle.

5. In a drilling machine, in combination, a base, a rotatable support mounted on the base and having an eccentric socket, a slotted bracket on the base, a work holder mounted on the su port and having depending pins fitting in 51c socket and slot, res ectively, a flexible drill s indle, and means or simultaneously rotating the spindle and the aforesaid support. 4

6. In a drilling machine, the combination of a drill spindle formed of sections and having a universal joint therebetween, a wheel under the drill, means to simultaneously rotate the spindle and the wheel, a work holder eccentrically pivoted on the wheel and revolved thereby when the wheel is rotated, and means to prevent rotation of the work holder with respect to the axis of the drill.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ZEBULON F. HIGHSMITI-I.

Witnesses:

H. DANDRIDGE, Jr., W. M. ADDISON.

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