US2080880A - Polishing machine - Google Patents

Description

May 18, 1937.

F; SCHENK PoLIsHING MACHINE Filed Dec. 1o, 1955 2 sheets-sheet 1 ETI'QQL ...4| ILLIIIN 4 May -18, `1937. F. S'HENK 2,030,880

PoLIsl-IING MACHINE Filed Dec. 10, 1935 2 Sheets-Sheet' 2 INVENTOR.

BY' l Patented May 18, 1937 UNITD ST'iES PLISHING MACHINE Friedrich Schenk, `lamaica, N. Y., assigner to E. Leitz, Inc., a' corporation of New York Application December 10, 1935, Serial No. 53,709

5 Claims.

This invention relates toimprovements in polishing machines for use in iaboratories and like places for the purpose of polishing metal specimens for testing and research work. The object of the invention is to provide a generally improved polishing machine embodying electromagnetic means for holding th-e specimen against the polishing medium and including such novel features of arrangement and construction as will provide a selfcontained polishing unit. Other objects of the invention will appear as this speciiication proceeds. Accordingly the invention is embodied in a polishing machine arranged and constructed as hereinafter set forth and as illustrated in the accompanying drawings in which Fig. 1 is a top view of the machine.

Fig. 2 is a side View with parts broken away.

Fig. 3 is a rear view.

Figs. 4, 5, and 6 are detail views of the polishing mechanism.

Fig. 'l is a wiring diagram.

One object of the invention is to provide a machine which shall be va complete polishing unit adapted to be moved about and operated by merel ly connecting it to an electric circuit. The. machine therefore includes polishing elements and means for operating them so arranged that the polishing operation may be carried out automatically and very rapidly. The machine has a general framework consisting of uprights forming legs i9, i9 which carry a top i! and shelves i2, i3, f4 and l5. The polishing mechanism corn-- prises a polishing disk I5 and a work holder il. The polishing disk is of iron and is covered with a fabric i8 removably held in place by a ring i9, Figure 6. The disk is removably carried by a main upright shaft 29 by means of a pin and slot connection as at 2l. The shaft is suitably supported in the framework and carries a pulley 22 and is driven from a motor 23 which is part of a well known driving mechanism known as avarispeed motor mechanism. This mechanism includes a base 24 in which the motor is slidably operated by means such as indicated at 25. A speed changing shaft 26 is employed to slide the motor 23 towards and away from the disk shaft 29. A belt passes over the pulley 22 and to another pulley 2'l driven by the motor 23. The mechanism is so arranged that when the motor is moved upon its base the speed of the pulley 21 is automatically changed. For the purposes of this specification it is suicient to knowk that when the shaft 29 is turned by the operator by the handwheel 29 the speed of the main shaft 2li and pulley 22 is changed to suit the polishing operation. A pointer 30 isattached to the motor sliding means 25 and indicates the speed upon a scale 3l The work holder Il' is in the forin.` of a thin plate having openings 32 to receive specimen holders of the type used in laboratories and indicated in Figure 4 at 33 to hold a specimen 34. The work holder is screwed on to a work holder shaft 35 which carries a bevel gear 3d driven from another bevel gear 3l upon a horizontal shaft. The latter in turn is driven from an upright shaft 39 by means of bevel gears iii and lil. The shaft 39 is slidably connected to another upright shaft 42 which is driven from a small motor i3 through g1 a suitable reducing gear mechanism M, Figure 3.

The workholder driving means are supported within a tubular casing i5 and means are provided for lifting the lwork holder upwards away from the polishing disk i6 shown in Figure 4 and swing it in over the table top into an inactive position when the polishing operation has been completed. As seen in Figure 5 the shaft 39 is in slidable driving connection at d@ with the shaft 42 and is supported Within a bearing sleeve di. The latter has a slot 48 which ts over a pin 49 in a Xed bushing 50 secured to the table top il. In the position shown in Figure 5 it is clear that the two shafts 39 and i12 are in operative driving connection and consequently the work holder Il is rotated by the driving connections 5 described. However, when the polishing operation has been completed, the operator takes hold of the casing and lifts the work holder away from the disk I6. The bearing sleeve 4l is secured to the casing 45 and is therefore also lifted sliding on the pin 49 until it is above said pin at which time the casing i5 is rotated and the work holder swung in over the. table as will be understood. The two shafts 39 and 42 remain in driving connection because the vertical movement `necessary to bring the sleeve to rest above the pin 49 is less than the movement required to disconnect the two shafts. The rotation of the work holder driving shaft 42 isstopped by opening the switch 66 in the electric circuit to the work holder motor 43. The reverse movement of course places the work holder in working position.

The table top Il has a circular opening 52 through which the polishing disk is lowered into operative position upon the shaft 20. Before the disk is lowered there is placed in said opening a circular drain pan 53 and after the disk has been placed, a circular splash ring 54 is positioned within the opening 52. drain opening 55 which drains into a vessel 56 The splash pan hasr a n through a rubber hose 5l, Figure 3. 'Ihe table carries a hinged cover 58 adapted to be closed down over the work holder in its operating position. The table also carries a bottle 59 for containing a suitable polishing liquid, for instance lavigated aluminia. The liquid drips down upon the polishing disk by way of a rubber hose 60 connected to an inlet 6I in the cover 58. 'I'he liquid is agitated by air being blown into the bottle from a small blower G2 driven by the motor 43. 'Ihe air passes to the bottle through a rubber hose 63. Liquid is poured into the bottle 59 through a funnel 64. In Figure 1 the numerals 65 and 66 indicate switch levers and 68 the operating knob of a rheostat 6.9L These parts are therefore in the front of the machine. The shelves in the framework serve to support the several parts. Shelf I4 may support a transformer 1D if such is needed depending upon the local current. Shelf I5 is convenient for storage. 1I is an electromagnet supported on the shelf I2 in alinement with the work holder I1 when the latter is in operating position, Figure l.

In operation the work holder Il is moved from its normal inactive position and swung into its operative position above the polishing disk as shown in Figure 4, the. specimens to be polished having first been placed in the openings 32. It will be noted that the work holder plate II is screwed into the shaft 35 so that it may be exchanged for work holders of other design. 'I'he bottle 59 has of course been filled with polishing liquid. The lid 58 is then closed and the outlet from the bottleopened. 'I'he operator then closes the switches 65 and 66 thereby starting the two motors and also closing the circuit through the magnet 'II which may be regulated by the rheostat 69, Figure 7. 'During the operation the specimens are drawn down against the polishing disk by the magnet 1I and the polishing is accomplished by the rotation of the disk I6 in one direction and the rotation of the work holder in the opposite direction in an obvious manner. The polishing liquid is being agitated by the air stream from the blower 62 and drops upon the fabric I8 and spreads by Centrifugal action. The splash pan 53 and splash ring 54 catch the liquid between them as it is being thrown off from the disk I6. The operation is stopped from time to time to inspect the specimen.` Also at the start or at any time during the operation the speed of the polishing disk may be adjusted by operating the hand wheel 29.

When the specimens have been polished they are removed and the machine is easily cleaned and put in order for the next operation because of the detachability of the work holder, the splash pan and ring of the polishing disk. The machine is highly efcient, self-contained and portable. It will further be understood that the invention is not limited to the precise form shown but that changes and modications may be made within the scope of the appended claims without departing from the principle of the invention.

I claim:-

1. A polishing machine including a framework, a polishing disk supported therein, means for suuplying polishing liquid to said disk, a vessel supported beneath the disk to receive polishing liquid thrown oir of said disk, a splash ring above the disk, a work holder in operative relation to said disk, a motor for rotating the disk, a second motor for rotating the work holder and a blower operated from said second motor to agitate the said polishing liquid before it reaches the said disk.

2. A polishing machine including a framework, a table top thereon having an opening, a polishing disk, a main shaft for detachably supporting the disk within said opening, a work holder, a motor for rotating the same, driving connections between the motor and the work holder, supporting means enclosing said driving connections, and capable of being moved vertically and horizontally to place the work holder into and out of operative relation to the polishing disk without disconnecting the work holder from the said motor and a second motor for rotating the said main shaft.

3. A polishing machine comprising a framework, a table top thereon having an opening, a polishing disk, means for supporting the same within the said opening, a work holder, a hollow casing supporting said work holder in vertically movable and laterally swingable relation to the polishing disk, electromagnetic means for keeping the work in said work holder in frictional polishing relation to said disk, a vessel containing polishing liquid mounted above said table top, a cover for covering the said work holder and disk during the polishing operation, means attached to said cover and vessel for supplying polishing liquid to the polishing disk, means for draining the liquid thrown off from the disk during the polishing operation, means for agitating the polishing liquid in said vessel, a motor for rotating said polishing disk, a second motor and driving connections between the latter and the work holder contained within the said hollow casing.

4. A polishing machine comprising a framework, a table tcp thereon having an opening, a polishing disk, means for supporting the same within the said opening, a work holder, a. hollow casing supporting said work holder in vertically movable and laterally swingable relation to the polishing disk, electromagnetic means for keeping the work in said Work holder in frictional polishing relation to said disk, a vessel containing polishing liquid mounted above said table top,

a cover for covering the said work holder and disk during the polishing operation, means attached to said cover and vessel for supplying polishing liquid to the polishing disk, means for draining the liquid thrown oi from the disk during the polishing operation, means for agitating the polishing liquid in said vessel, a motor for rotating said polishing disk, means for supporting the motor in speed variable relation to the said disk, a handle for actuating the said motor supporting means, a speed indicator for said motor and a second motor for rotating the work holder and operating said agitating means.

5. The combination of a movable work holder, a polishing disk, an electromagnet supported underneath said disk in operative relation to the work holder, an electric motor for rotating the work holder, driving connections between the latter and the said motor, a swingably supported housing enclosing said driving connection-s for placing the work holder into and out of operative relation to the polishing disk and the electromagnet, a second motor for rotating the polishing disk, an electric circuit including the said two motors and the electromagnet, a switch in said circuit for closing the circuit through one of the motors and the electromagnet and another switch for closing the circuit through the other motor. y

FRIEDRICH SCHENK.

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