US214889A

US214889A - Improvement in millstone-dressing machines

Info

Publication number: US214889A
Authority: US
Publication date: 1879-04-29
Anticipated expiration: 1896-04-29

Description

2 Sheets--Sheet 1.

J. G. GOOKSON & S. L. HART.

Millstone-Dressing Machine. No. 214,889. Pa tented April 29, I879.

IWVEJVTORJ WITWE' Is I wa W .ATTOJWEYS- N-PETERB, PMOTOUTHOGRAPHER. WASHINGTONv D C.

w 2 Sheets-Sheet 2. J. G. OOOKSON & S. L. HAR

Millstone-Dressing Machine. No. 214,889. Patented April 29,1879.-

N-FEIERS, PHDTO-LITHDGRAFNER, WASHKNGTDN, u c.

UNITED STATES PATENT OFFICE.

JOHN G. OOOKSON AND SAMUEL L. HART, OF MENASHA, WISGONSIN, ASSIGNORS TO SAID OOOKSON.

IMPROVEMENT IN MlLLSTONE-DRESSING MACHINES.

Specification forming part of Letters Patent No. 214,889, dated April 29, 1879 application filed September 28, 1878.

To all whom it may concern:

Be it known that we, JOHN G. OooKsoN and SAMUEL L. HART, of Menasha, in the county of Winnebago and State of Wisconsin, have invented a new and valuable Improvement in Millstone-Dressing Machines and we do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a top plan of our millstone-dressing machine. Fig. 2 is a side elevation of the same. Fig. 3 is an end view, part sectional. Fig. 4 is a longitudinal sectional view of the carriage, and Figs. 5, 6, 7, 8, 9, 10, 11, 12, 13,14, 15 are detail views of the same.

Our invention relates to a machine for dressing millstones and the like, and the novelty of construction, adaptation, and arrangement will be hereinafter set forth.

Our invention is designed as an improvement upon the. devices shown in Patents No. 185,125, of December 5, 1876, No. 191,938, of June 12, 1877, and others.

The great desideratum in this art is to obtain a true face on a stone; and to this end our invention consists, first, in resting the machine-frame on three feet or bearings placed in triangular position on the frame, two or more of which are so constructed as to allow of vertical adjustment at will. One of these adjustable feet is placed on the forward end of the machine, and adapts the machine to vertical longitudinal adjustment, either on a true horizontal plane or at any desired angle above or below the same. On each side of the rear end of the machine is secured a foot, one or both of which may be adjustable to afford ready facility for obtaining a true horizontal laterally, or any angle or incline that may be desired.

The importance of this construction is obvious when it is understood that in dressing around the face of a stone the forward end, which rests upon the undressed portion, is upon a higher surface than the rear end, which rests upon the dressed portion, and great nicety of adjustment is required. The facility and correctness with which our device can be adjusted constitutes its advantage over the machines which rest upon the whole surface of the frame, or those which have no adjustment.

In dressing around the face of a stone it is obvious that the foot which precedes rests upon a higher surface than the one which follows upon the dressed surface, and in such case to adjust for uneven surfaces the. foot which follows may be made adjustable and the other be fixed.

Qur machine is adapted to extend entirely across theface of the stone to be dressed, the eye of the stone lying about the center of the machine, which, resting upon three points, each of which is near the periphery of the stone, affords a more extended and firmer bearing, and prevents oscillation of the bed-plate.

Our invention consists, second, in the construction of the adjusting-feet. In the lower surface of a horizontal block or bar we form a mortise or slot having an inclined bottom, which slot receives a sliding wedge actuated longitudinally by a screw. This wedge is adapted to rest upon the surface of the stone, and it serves to raise or lower the -bed-plate as the wedge is forced inward or outward by the screw.

A screw-rod passing upward through a slot in the foot-block receives a thumb-nut, and said rod being rigid with the wedge the same may be firmly secured against displacement at any desired point of elevation by screwing down the thumb-nut until it binds upon its bearings above the slot.

The diamond or tool working upon the surface of the stone exerts a continuous upward force, and in dovetail or triangular bearings tends to bind the carriage in the wedge-shaped guideways.

To avoid this evil our invention consists, third, in constructing our guideways with a true horizontal upper surface to correspond with a similar bearing-surface on the flange of the carriage, thus avoiding any wedging or binding tendency from the upward pressure of the carriage.

To accomplish this We form the inner edge of the two parallel sides of the bed-frame at a bevel or incline, and secure by bolts or other wise upon the top of each side a flat plate or strip, which extends over the beveled portion, as shown. This construction of guideway also enables the operator to adjust the give more The fourth and fifth parts of our inventionconsist in a tilting adjustable carriage-frame, by means of which the drill or diamond may be inclined either tothe right or left, adapt ing it to dress the beveled furrows. Upon'the inner surface of the standards of the main carriage we form two lugs, upon which rest reversely-inclined surfaces upon each down wardly-extending side of the carriage-frame. A perforated car upon'this carriage-frame re ceives a threaded rodon the transverse carriage-way, and a thumb nut serves to force the carriage-frame either to the right or left, and the'inclines, acting upon the lugs, deflect the transverse carriage-way in either direction, and consequently direct the tool or diamond at any angle desired. To adapt this tilting transverse carriage-way to the mechanism which operates the transverse carriage, and which will be hereinafter described, we employ a loose connection, consisting of a nut, which traverses a horizontal transverse screwrod, and a link, loosely pivoted thereto, which link is also loosely pivoted to a lug on the transverse carriage. This loose connection allows the ready and important adj ustahility of the tool-holder, as is obvious. By this con struction l obviate the necessity of employing an extra cross-head.

The staifingdevice constitutes the sixth part of our invention; and it consists in a metal ring secured to the upper portion of the frame near the center, and perfectly true with the plane of the same in any direction. A tramming-bar secures a straight arm to the ring, at the endof which arm is an adjustable paintblock adapted to sweep the face of the stone and indicate the condition of the surface.

The seventh part of our invention consists in an automatic device forimpelling the transverse carriage to the right or left. A disk, rigidwith a horizontal threaded transverse bar; is acted upon by a clutch, which, by means'of adouble spring and eccentric, can bemade-to operate in either direction-that is to say, when the eccentric is turned in one direction the clutch will gripe and turn with the diskin one direction a certain distance with'eachtraverse of the main carriage; but onthereturn of the clutch it will ride uselessly along the surface of the disk, and, turning the eccentric in the opposite direction, will obtain a directly opposite result. A spring trigger, operating upon an adjustable studon the side of the bed-frame with each traverse of the main carriage, operates the clutch. It will thus be bserved that, afterthe clutch hasoperated t horizontal threaded bar in one directionuntil-thenutwhicho erates the transverse carriage has traversed-the length of said bar, it is only necessary to change the eccentric to make the said nut move in the opposite direction. By throwing the clutch: out of actionthowever, the transverse carriagermay be turned back by means of a crank on the end of the shaft.

The eighth part of our invention consists in a device for moving the machine around on the face of the stone. A lever is pivoted to the bed-frame near its forward portion, and to this lever is pivoted a cross-bar, slightly longer than the width of the frame, having downward-projecting ends, upon which are feet adapted to rest on the face of the stone. The length of the downward projections'is slightly greater than the distance from the top'of the frame under the cross-bar tothe surface of the stone: When the shoes rest upon the stone the'leveroperates to both lift the frame and move'it totlieright or left, as desired.

In dressing stones of smallerdiameter it is desirable that the traverse of the main carriage should not exceed the distanceof the surface to-be dressed.

To accommodate'ourdevice' to this condition of things, the ninth partof our invention consists in having two or more sunk bearings on the side of the frame in'which to receive the slotted plate which carries the stud against which the-spring-trigger operates. A portion of the capplate which forms the guideway for the main'carriag'e is in sections, and the fasteningswork in transverse-slots, allowing' the section'to be-forcediuward, andconstitute a stop against Whiclithe main carriage will abut at the end of the traverse.

Referring tothe-drawings, A represents the bed-frame, having opencenter, as shown, and provided with feet a a a; one-on each side of the body and one at the'forward end, two or more of which'may be'adjustable;

The lower surfaceof the adjustable feet is provided with a slot, c; Having an inclined bottom, a, adapted to receive awedge=shaped shoe, a having an ear, a which-receives and is operated by a screw-bolt, a, which works in the foot a. Rigidwith" and extending upwardfrom the shoea isa threaded rod, a, which passes through'a slot in" the shoe and receives athumh nutt a.

The inner upper edge of the bed frame A is beveled at b, andsecuredtothe upper surface of the parallel sides oftiie-frame are plates B B, extendingover'the'beveled'portion, the latter of which is madein sections, the rear sections havingtransverse"slots'b'i To the forward portion of the hed-frame'A is pivoted'alever, O, andto said'lever is pivoted' a' cross=b'ar, 0, having dowuwardlyextending projections, c, uponwhich'are formed feet or bearingsc;

Near themiddle ofthe fraine-upon its upper surface-is secured aring,'B,' true in' any direction with the plane of the bed, to which is loosely held a straight arm, 01, by a tramming-bar, D. Upon the outer end of the arm d is adjustably secured by screws 01 a paintblock, (1

In the guideway formed by the parts B B b traverses the main carriage E, having flanges e to correspond with the guideway. E represents the back standard of the main carriage, and E the front standard, and between these standards is a transverse framing, F, having reverse inclines ff formed in its downwardlyprojecting sides, which reverse inclines rest upon lugs e in each of the standards E E A perforated ear, f, upon the end of the frame F receives a threaded rod, g, upon the end of the transverse carriage-way G, and this rod is acted upon by a nut, g, which being turned in either direction tilts the transverse carriage, carriage-way, and framing to the right or left, as desired, in consequence of the inclines f f acting upon the lugs e".

In the guideway of the carriage-way E operates the transverse carriage or tool-holder H, from a perforated lug, h, at one end of which is pivoted a link,'h, which is pivoted at its other end to a nut, H. This nut traverses a screw-threaded rod, I, journaled in the upper part of the standard E.

The tool-holder is constructed of an outer cylinder J, which is provided near its lower end, on the inside, with a guidepin, j, which sets into a vertical groove on the outside of an internally-threaded tool-holder, J A vertical adjusting rod or shaft provided with a screwthreaded downward extension (not shown), engages with the internally screw-threaded toolholder, so as to adjust the same upward or downward, according to the direction in which the hand-wheel J on the top of the rod is turned. The diamond is thus adjusted so as to cut deep or shallow, as desired.

This construction is not fully shown in the drawings of this application, but forms a part of the patents hereinbefore cited.

To a bar, K, secured to the back side of the standard E is attached a handle, k, and an arm, K, extending upward, carries a thumbscrew, 70, which operates upon a spring-brake, L. This brake acts upon the periphery of a disk, M, which is rigid with the horizontal screw-threaded rod I, and revolves with it in any direction.

A lever, N, is provided at its center with a slot, n, which receives the shaft of the rod I, and is provided at its upper portion with a slot, N, which receives the rim of the disk M, and at its lower portion with a spring-trigger, O. Pivoted to the upper end of thislever N is a lever, P, holding a double spring, R, which, being acted upon by a double-acting eccentric, R, throws the lever N to the right or left, according to the direction in which the eccentric is turned. This. action of the lever N forces the portion of said lever which embraces the rim of the disk M to act as a clutch. The spring-trigger O, striking the-stud S on the plate S, adjustably secured to the side of the frame A, as the 'main carriage F is traversed in either direction, serves, in connection with the clutch, to turn the rod I a certain distance at each traverse.

Sunk bearings X on the side of the bedframe A allow the adjustable plate S to be moved nearer to the center of the machine in dressing small stones, and in such cases the rear sections of the plates B, having the slots 1), are forced inward, and serve as a stop to the main carriage.

From the foregoing description the operation of our machine is obvious.

What we claim as new, and desire to secure by Letters Patent, is-

1. A stone-dressing machine provided with three feet or bearing points placed triangularly, one on the forward end of the bed-frame and one on each side near the back end, the former and one or both the latter being adj ustable vertically, as and for the purpose set forth.

2. The foot-block at, having horizontal inclined slots a and vertical slot, combined with the wedge-shaped shoe a having screw,- rod a the nut a and the actuating-screw a as and for the purpose set forth.

' 3. The guideways for the operating carriage, formed by the bevel b upon the inner sides of the bed-frame, and the flat plates B B, secured upon the top thereof, substantially as and for the purpose specified.

4. The standards E E having lugs 6 in combination with the carriage-frame F, having reverse inclines ff, the transverse carriage-way G, having screw-rod g, and the actuating nut g, as specified.

5. The adj ustabletiltingtransverse carriage, as described, in combination with the link It, traversing nut H, and transverse rod I, as and for the purpose set forth.

6. The combination of the ring .D, rigid with the bed, with the tramming-bar D, the arm d, and adjustable paint-block d d, as and for the purpose specified.

7. The combination of the disk M, lever N, clutch N, double spring It and eccentric R, with the'spring-trigger O and stud S, as specified.

8. The combination of the pivoted lever (J, pivoted cross-bar 0, having downward projection c and shoes 0, with the frame of a millstone-dressing machine, as and for the purpose specified.

9. The bed-frame A, having two or more sunk bearings, X, in combination with the slotted plate S, having studs S, the sectional cap-plate B, having transverse slots, and the main carriage E,as and for the purpose specified.

In testimony that we claim the above we have hereunto subscribed our names in the presence of two witnesses.

JOHN G. OOOKSON.

Witnesses: SAMUEL L. HART.

P. V. LAWSON, J r.,