US737220A

US737220A - Grinding and polishing machine.

Info

Publication number: US737220A
Application number: US9074302A
Authority: US
Inventors: William L Godfrey; Charles N Rivers
Original assignee: GEORGE H BOWERS
Current assignee: GEORGE H BOWERS
Priority date: 1902-01-22
Filing date: 1902-01-22
Publication date: 1903-08-25
Anticipated expiration: 1920-08-25

Description

- No'.737 v,220. 'PATENTB'D'AUG; 25, 1903-;

' w. L. GODFREY&G.N. RIVERS.

GRINDING AND POLISHING MAGHINE. APPLICATION TILED JAN. 22, 1902.

N0 MODEL. 3 8HEETS-SHBBT 1.

WITNESSES: INVENTORS Attorneyo',

No. 131,220. 7 I .PATENTED AUG. 25,- 1903.;

' w. I, G-QEEEEY a; RIVERS.

' GRINDING; Am musmm MACHINE. AIRLIQA'HQR rmm JAR". 22. 1992.

no mum mums-sum 2.

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, mummnn WITNESSES:

I0 IODEL.

No. 737,220. PATENTED AUG. 25, 19-03.

w. L. GODFREY a; 0. N'. RIVERSi 1 GRINDING AND POLISHING MACHINE.

APPLICATION HL'ED JAN..22, 19oz.

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Q "I mm imniinimminl UNITED STATES WILLIAM L. GODFREY, OF BROOKLYN, AND CHARLES N. RIVERS, OF NEW "in Patented 'Aug'ust 25, 1903.

PATENT OEEIOE. j 1

YORI N. Y., ASSIGNORS T0 GEORGE H. BOWERS, OF BROOKLYN, NEW

YORK.

GRINDING AND POLISHING MACHINE.

QPEGIFIGATION forming part of Letters Patent No. 737,220, dated August 25, 1903.

I Application-filed January 22, 1902. Serial No. 90,743. v(No model.)

To a whom-it may concern: Y

Be it known that we, WILLIAM L. GODFREY,

residing in the borough of Brooklyn, city of New York, county of Kings, and CHARLES N. RIVERS, residing-in the city of NwYork, county of New York, State of New York, citizens of the United States, have invented certain new and useful Improvements in Grind ing and Polishing Machines; and we do hereby declare the following to be a'full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention is an improvement in grinding and polishing machines adapted particularly for grinding and polishing the plain surfaces of metal plates and similar articles;- and it consists in the novel features hereinthe polishing-belt. Fig. 4 is a plan View of a portion of the belt, showing the polishing or outer face thereof. Fig. 5 is a similar view of a portion of the belt, showing the in nor face of the same. Figs. 6 and 7 are detail views of the mechanism for raising and lowering and adjusting the work-supporting table. Fig. 8 is a top plan view of the worksupporting table. Fig. 9 is a vertical longitudinal sectional view of the same. Fig. 10 is a top plan view of the vertically-movable carriage which supports the table. Fig. 11 is an enlarged'perspective view-of the mechanism for oscillating the table. 5

Referring to the drawings, A represents the main frame of the machine, which is supported uponsuitable legs a and carries the working parts of the machine.

B B represent a pair of drums for carrying and driving the polishing-belt. One of said drums is so mounted as to be adjustable toward and from the other in order to hold the polishing-belt at the proper tension. the present instance I have shown the shaft 1) of the drum Bmounted in pillow-blocks b rigidly secured to the frame Aof the machine. The shaft b of the drum B is mounted similarly in pillow-bl0cksb which are arranged to slide in the main frame, preferably by having dovetailed portions engaging a suitable guiding-groove in the frame, (not shown,) an d each of said pillow-blocks b is provided with anadjusting-rod b extending through a bracket 12 secured to the frame A andprovided with an adjusting-nut 12 as clearly shown in Fig. 1, for the purpose of moving the drum B longitudinally of the ma chine to maintain the polishing-beltat the 4 proper tension.

0 represents the polishing-belt, which is preferably of leather and may be made in one piece or in the form of'a series of belts-having'conti'guous edges Orin any other usual or desired manner; The belt O is provided on its inner face with aseries of transverse bars c, arranged at regular intervals and extending, preferably, entirely across the full width of the belt. These bars preferably have their forward edges beveled or rounded, as shown at 0, (see Fig. 3,) and for convenience of reference we term these bars the friction-bars or pressu re-bar's. The exterior face of the belt 0 is provided with-a series of transversely-disposed bars, which for convenience of reference We term polishing-bars and which are indicated by the letter 0 It is preferable that these polishing-bars should not extend entirely across the face of the belt, and we prefer to arrange them in whatmay be termed staggered arrangement, so that certain of said polishing-bars are in line with certain portions of the belt, while other polishing-bars are arranged in line'with other longitudinal portions, the arrangement being such that the various pressure-barswill extend laterally, so as to be in line with all longitudinal portions ofthe belt. In securing the friction-bars and pressure-bars to the belt we prefer to place certain of the pressure-bars directly opposite each of the fric tion-bars and to secure both to the belt by riveting entirely through the bolt the fri c-.

too

Lion-bar and the pressure bar or bars. To provide the necessary polishingsurfaces, strips 0 of suitable material, such' as felt or walrus leather, are applied to the belt, stretched over the various polishingbars, and riveted or otherwise secured to the belt on each side of the polishing-bars. It is to be noted, however, that the polishing material is not secured in any way to the polishingbars themselves.

Power is applied to one or both of the drums B B, as preferred. In the present instance the drum B only is driven, and the said drum is provided on its periphery with projections 11 (see Fig. 1,) which may consist of one or more lugs, studs, or cross-bars, the said projections being arranged at intervals around the periphery, which intervals correspond exactly with the intervals between the friction-plates c of the polishing-belts. The arrangement is such that these projections will fall in directly in rear of the friction-platesc when the machine is in operation, and will therefore insure the positive driving of the polishing-belt and will prevent the slipping of the belt upon the driving-drum. Power may be applied to the shaft 1) of the drum B in any desired way.

D represents what we term a frictionplate supported by brackets dfrom the frame A and extending transversely of the machine directly over the work-supporting devices. This plate is provided with a hardened-steel lower surface, and the forward transverse edge of the plate is rounded, as indicated at d, Fig. 1. As the polishing-belt is operated the friction-bars c engage the lower face of the friction-plate D and hold the polishing devices from upward movement during their passage over the article being polished.

E represents the work-supporting table, which is provided with suitable devices for holding the work (not shown) and which is superimposed upon a vertically-movable and vertically adjustable plate or carriage F. (Shown in detail in Fig. 10.) The devices for supporting, adjusting, and operating the table include the following devices:

G G represent a pair of vertically-disposed slides, preferably dovetailed and engaging dovetailed guides g, bolted or otherwise secured to the frame A, preferably to transverse bars or webs A, extending across from one side of the frame A to the other. Each of these slides is provided with a vertical rackbar g, which is engaged by a pinion h on a shaft H, extending longitudinally of the machine and provided with a beveled wheel h, meshing with a beveled wheel 0; on a shaft I, extending through one of the side frames of the machine and provided with a ratchetwheel 1', which is engaged bya pawl F. The shaft I is also provided with a crank t or other suitable device for rotating. Each of the vertical slides G is provided at its upper end with a horizontal bar G, (see Figs. 6 and 7,) and each of said bars G is provided, prefanism for the purpose of leveling the carriage and table, the.

Mechanism is provided, as hereinafter described, for imparting motion to the table E transversely of the polishing-belt and at the same time swinging it into different angular positions'with respect thereto to prevent the formation of lines or grain in the plate or other article being polished.

In order to reduce the friction between the table E and carriage F as much as possible, the upper face of the carriage F is preferably provided with the curved bearing-webs ff' and a central bearing-Web f in the center of which is a transversely-extending slot f The lower face of the table E is provided with similar curved bearing-webs c e and a central bearing-web (2 adapted to bear upon the corresponding parts of the supportingcarriage, and the table E is provided centrally with a downwardly-projecting pin or stud e, which engages the slot f in the carriage F and is adapted to slide therein transversely of said carriage.

The table E is provided at one end with a lug or projection 6 lying between two stop lugs or projections f connected with the carriage F and adapted to be engaged by the lug e of the table. We also provide mechanism for moving the table E transversely, which is shown in Figs. 1 and 2. 75 represents a bellcrank lever pivotally mounted on a bracket f secured to one side of the carriage F and having one end provided with a pivotal connection with the table E. In this instance the bell-crank lever is provided with a pin engaging an aperture in a bracket a, secured to one edge of the table E, adjacent to the end opposite that which is provided with the lug e The other arm of the bell-crank is connected by a balland socket joint with a connecting-rod 7c, extending to a crankpin 1& on a wheel K, mounted on a shaft Z, extending transversely of the machine. By this means a transverse reciprocatory movement is imparted to one end of the table E, the resulting movements of the table being modified by the sliding of the pin 6 in the slotf and by the lug a coming into contact with the stop-lugs f Supposing a table E to be in the position shown in Fig. 8, in which the full lines show it in one extreme of its movement, the first efiect of the return movement in the direction of the arrow would be to swing the table on its pivot 6 until the lug e strikes the opposite stop-lug f", when the table will be substantially in line with the frame of the machine. The further movement of the table in a direction of the arrow will cause the pin 6 to travel across the slot f the table being in a position inclined to the longitudinal axis of themachine. When the motion is reversed, the operation above indicated will be repeated; It will thus be seen that the table not only oscillates upon its pivot, but in addition is moved bodily backward and forward across the carriage, thereby enabling the polishing-belt to act over the entire surface of the article which is being polished and at such variations of angular positions as to avoid the possibility of graining the surface of the article.

The following mechanism is provided for the purpose of supplying the polishing-belt with emery, rouge, or other suitable abrading or polishing material.

- M represents a hopper for containing the abrading or polishing material, which is provided with a regulating-gate or cut-off m for regulating the quantity to be supplied to the polishing-belt.

N represents a conveying-belt carried by a drum L on the shaft Z, before referred to, and a drum L on a shaft Z, supported in brackets from the end of the frame A, the upper portion of the belt N passing under the hopper M and extending horizontally toward the table E. The hopper Mis provided with side plates m, which extend on each side of the belt N to the table E to prevent,'as far as possible, the polishing material from leaving the belt. The work-engaging portion of the polishing-belt C will engage the upper face of the belt N and take up the polishing material therefrom and carry it onto the surface which is being operated upon. The belt N is conveniently driven from a pulley b on the shaft b by means of a belt b passing around the crank-wheel K on the shaft Z.

In operation the plate or other article to be polished is placed on top of the table E and secured in position in'any desired way. The machine is started,and the work-supporting table is raised by means of the mechanism heretofore described and operated by the crank i until the plate or other article is brought into contact with the polishing-pad on the belt 0 with the desired pressure, it being held in such a position by means of the pawl The polishing-pads will polish the surface of the plate or article, being supplied with abrading or polishing material, as before described, and the work-table and work will be given the oscillatory and lateral motion heretofore described, so as to prevent lining or graining the plate.

The particular construction of the polish ing-belt is not specifically claimed herein, this subject-matter being reserved to be covered by a subsequentapplication for Letters Patent of the United States.

an endless belt having a portion contiguous thereto, a stationary friction-plate arranged on the opposite side of said belt from the work-table, said belt being provided with polishing means on the face adjacent to theworktable, and provided on its opposite face with devices attached thereto to engage said friction-plate and means for driving said belt, substantially as described.

2. In a grinding and polishing machine, the

combination with the endless belt,supportingdrums therefor and driving mechanism, of a work-table arranged adjacent to one face of jacent to the other face, of said belt, opposite the work-table, said belt having the face adjacent to said plate provided with friction or pressure bars for engaging said plate and provided on its opposite face. with polishing means, substantially as described.

8. In a grinding and polishing machine, the

combination with an endless belt, supportingdrums therefor, and driving mechanism, of a movable work-supporting table arranged adj acent to the outside of said belt, a stationary friction-plate arranged adjacent to the inner face of said belt and opposite said work-ta a portion of said belt, a plate arranged ad-' drums therefor and driving mechanism for adjacent to one face of a portion of said belt, a friction-plate arranged adjacent to the other face of said belt, oppositesaid table, frictionbars arranged at intervals onthe face of said belt adjacent to said plate, polishing means one of said drums, of a work-table arranged arranged on the other face of said belt, the

drum operated by said driving mechanism said friction-plate-engaging devices of said belt, to positively drive said belt, substantially as described. 4

5.v In a grinding and polishing machine, the combination with an endless polishing-belt, and driving mechanism therefor, of a carriage movable toward and from said belt, mechanism for moving said carriage toward and from saidbelt, adjusting devices, for adjusting said carriage with respect to said mechanism, a, table movably mounted upon said IIO being provided with devices for engaging carriage, and means for moving said table in:

a plane parallel to the plane of the carriage, substantially as described.

6. In a grinding and polishing machine, the combination with'an endless polishing-belt and driving mechanism therefor, of a carriage arranged below a face of the belt, mechanism for raising and lowering'said carriage, a table movably supported upon said carriage, said carriage and table having the one a pivot-pin engaging a slot in the other and devices adjacent to one end of said table for limiting its oscillation upon said pivot-pin, substantially as described.

7. In a grinding and polishing machine, the combination with an endless polishing-belt, and driving mechanism therefor, of a carriage arranged belowa face of the belt, mechanism for raising and lowering said carriage, a table movably supported upon said carriage, said carriage and table having the one a pivot-pin engaging a slot in the other, said carriage and table also having the one a lng, and the other two stops, for engaging opposite sides of said lug, to limit the oscillation of said table upon said pivot-pin, substantially as described.

8. In a grinding and polishing machine, the combination with an endless polishing-belt, of a carriage arranged below a face of said YVitnesses:

\V. L. MURRAY, FRANK R. WHITMAN.