US761023A - Rubbing or polishing machine. - Google Patents

Description

PATBNTED MAY 24, 1904. 0. s. YARNELLP RUBBING 0 POLISHING MACHINE. APPLIUATION FILED OCT. 31. 1903.

N0 MODEL.

3 SHBETS SHEET 1.

51 v r W F W I! I) BATENTED MAY 24,- 1904.

0. s'. YARNELL. RUBBING 0R POLISHING MACHINE.

APPLICATION IILBDIOOT; l. 1903.

3 SHEETS-SHEET 2.

N0 MODEL.

cu e M2 No. 761,023. PATENTED MAY 24, 1904.

' c. s. YARNELL'.

RUBBING 0R POLISHING MACHINE.

APPLICATION 311.21) 001 .31. 1903.

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UNITED STATES "Patented May 24, 1904.

PAT NT ()EEICE.

CHARLES s. YARNELL, or MINNEAPOLIS, MINNESOTA.

RUB BING OR POLISHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 761,023, dated May 24, 1904.

Application filed October 31, 1903.

To all whom it may concern.-

Be it known that I, CHARLES S. YARNELL, of Minneapolis, in the county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Rubbing or Polishing Machines, of which the following is a specification.

This invention relates to rubbing and polishing machines designed especially for sandpapering or polishing surfaces of wood, although the machine is capable without reconstruction of being used for rubbing or polishing surfaces of other materials.

The object of my present invention is to provide a machine that is capable of operating upon a large surface, whereby the plane surfaces of wooden articles, such as table-tops,

I may be rapidly and economically finished.

Another object of the invention is to provide a machine that is easily operated and is simple and economical in construction.

In the accompanying drawings, forming part of this specification, Figure 1 is a front elevation of a machine embodying my invention. Fig. 2 is a plan view of the same. Fig. 3 is a detail of a portion of the table. Fig. 4 is a detail section on line A 4 of Fig. 2. Fig. 5 is a transverse section on line 5 5 of Fig. 2. Figs. 6 and 7 are details of the pressure-plate and the means for controlling the same. Fig. 8 is a detail of the connection between the opcrating-lever and the bar carrying the pressure-plate. Fig. 9 is a detail of the means for adjusting the table.

In the drawings, 2 represents the frame of the machine, which is of any preferred or suitable construction. This frame carries the horizontal rails or ways 1, upon which is supported by suitable wheels 3 the work-table 3. This table may be moved forward and back by hand beneath the sanding or polishing belt. Arranged in the standards 2 are the threaded shafts 4, suitably connected to the rails or Ways 4 (see Fig. 9) and provided at their lower ends with sprocket-wheels 2', connected through the base of the machine by a suitable sprocket-belt 2". One of the shafts 1 is provided with a beveled pinion 4:", arranged to be operated by a crank-shaft 5, carrying a pinion that meshes with the pinion -ed a shaft 15.

Serial No. 179,274. (No model.)

1''. 2 By turning the crank-shaft 5 the rails or ways 4 and the work-table supported thereon may be raised or lowered, while at the same time the table is maintained in a horizontal position.

The frame of the machine, the work-table, and the means for operating the same are substantially the same as the corresponding parts shown and described in Letters Patent of the United States No. 743,608, issued to me November 10, 1903.

Secured upon the standards 2 are the horizontal bars or beams 6, which are suitably secured at their ends to the upper portions of the standards 2. Said beams are thus separated a distance substantially equal to the width of the upper end of each standard. Upon the beams 6 at a point substantially over one of the standards I secure a plate 7 carrying the shaft-boxes 8, in which is mounted a driving-shaft 9, having suitable fast and loose pulleyslO and 11. This shaft also carries the belt-pulley 12. The plate 7 is preferablyrigidly secured in position. At the opposite end of the machine I provide a plate 13,

carrying shaft-boxes 1A, in which is mount- This shaft carries a pulley 16, corresponding to the pulley 12. The plate 13 is preferably provided with the longitudinal slots 17 and bolts 18 pass through these slots and secure the plate in position. At the opposite edge of the plate I preferably provide a depending flange 19, through which extends 'these screws, which are mounted in lugs or standards 25 upon the plate 13, may be used to adjust the plate 21 upon the stud 22. By this means the shaft 15 may be adjusted so as to be exactly parallel with the shaft 9. Mounted upon the pulleys 12 and 16 is a suitable sandpaper or other rubbing or polishing belt 25. It will be seen that the lower portion of this belt runs above and parallel with the top of the table 3, and I prefer to provide means whereby pressure may be applied to this portion of the belt for the purpose of bringing the sanding or polishing surface thereof upon the material to be operated upon and holding it there with any desired degree of pressure. For this purpose I arrange above the lower portion of the belt a horizontal bar 26. This bar, as here shown, is of rectangular form and provided with a series of vertical openings through which extend the stems 27, that support the pressureplate 28. The plate 28 is preferably of substantially the width of the sanding 01' polishing belt and is arranged within and above the lower portion of said belt, so that the belt travels in contact with the under surface of said plate. The plate 28 is provided with a series of lugs 29, and said lugs are adapted to engage suitable cross-bars 30, pivotally connected to heads 31 upon the lower ends of the stems 27. The heads 31 are provided with arms projecting over the bars 30, and suitable springs 32 are arranged between the ends of said arms and said bars, being held in posi tion by suitable projections upon said arms and said bars. Adjusting-screws 33 extend through the ends of the arms 31, and by means of said screws the bars 30, and with them the plate 28, may be adjusted. Secured to the under side of the bar 26 are a series of nuts 34, and threaded sleeves 35 surround the stems 27 and engage said nuts 34. Springs 36 surround the stems 27 and are arranged between the sleeves 35 and the heads 31.

With this construction it will be seen that by adjusting the sleeves 35 the tension of the springs 36 may be increased or diminished at will. The upper end of each stem 27 is screwthreaded, and a threaded sleeve 37 is arranged to engage the threaded end of the stem, said sleeve resting upon the top of the bar 26 and being provided with a suitable hand-wheel 38. By means of the sleeve 37 the position of the bar 30 and the plate 28 connected thereto may be regulated. I provide means also for raising and lowering the bar 37 and with it the pressure-plate and connected devices. As here shown, a series of levers 40 are pivoted upon one of the beams-6 and extending forward are connected to the bar 26. I have here shown each of the levers 40 provided with a fork at its forward end, and this fork is made to engage" a collar 41, arranged upon a cylindrical portion of the bar 26, the connection between said lever and said collar being made by suitable screws 42. (See Fig. 8.) The rear portions of the levers 40 are bent downward between the two beams 6, and each of said levers is connected to a rod 41, and said rod is connected by a link 43, which extends through an opening in the rear beam 6, with a lever 44, having secured thereto an arm 45, carrying an adjustable counterweight 46. (See Fig. 5.) The lever 44 is pivoted in a lug 47, preferably secured upon the top of the forward beam 6. For the purpose of maintaining the bar 26 in a horizontal position as it is raised or lowered I prefer to provide upon said bar a lug 48 and upon the upper part of the beam 6 a corresponding lug 49 and to connect these two lugs by a link 50. Then as the levers 40 are swung upon their pivots for the purpose of raising and lowering the pressure-plate the link 50, connected to the lugs 48 and 49, prevents said bar from turning axially.

For the purpose of operating the pressure devices I provide an operating-rod 51, connected to the lever 44 and extending forward of the table of the machine. This rod carries the adjustable weight 52 and also the pivoted latch 53, which is adapted when the rod is raised to the position shown in Fig. 5 to catch upon the top of the forward beam 6, and thereby to hold the rod 51 and the pressure-plate in an-elevated position. A cord 54 is preferably connected to the latch 53, and by means of this cord when it is desired to lower the pressure-plate, so as to bring the sanding or polishing belt in contact with work upon the table, the latch is raised by means of the cord 54, and the operator can then through the rod 51 operate the levers 41 and depress the pressure-plate, causing said plate to bear upon the'sanding or polishing belt with any desired pressure and raising it therefrom at will. The sanding or polishing belt is therefore under the direct control of the operator at all times. A belt of considerable width may be employed, so that a large surface of the material to be finished will be operated upon, and therefore but a short time will be required to finish the surface of the largest article that can be placed in the machine.

I prefer to provide upon each edge of the table 3 a threaded shaft 55, mounted in suitable bearings 56 and capable of being rotated by having a crank applied to the end of the shaft. Each of these shafts is provided with a sprocket-wheel 57, and the two shafts are connected by the sprocket-chain 58, passing around said sprocket-wheels, so that said shafts are rotated in unison. Arranged upon each of the threaded shafts are the threaded blocks 59. (See Fig. 3.) These blocks are arranged at equal distances from the center of the table, and by rotating the shafts the blocks are simultaneously moved toward or from the center. Each of said blocks is provided with a vertical opening, and arranged upon the upper surface of the table 3 are the work-holding bars 60. These bars are provided at their ends with the pins 61, adapted to enter the openings in the threaded blocks 59. (See Fig. 3.) The bars maybe placed in position with their pins engaging the openings in the threaded blocks, and by rotating the threaded shafts the bars may be moved toward the center of the table until their inner edges are brought in contact with the edges of the table-top or other article to be operated upon. These bars will prevent the article from being movedout of position by contact with the traveling belt therewith. I prefer to provide the table with the handles 63, by means of which the operator while controlling the pressure on the belt through the rod 51 may move the table 3 back and forth beneath the belt, thereby bringing every portion of the article to be operated upon beneath the traveling belt.

The special advantages of this machine are found in its simplicity of construction, ease of operation, and large capacity.

The pivotal yielding connection between the bars to which the pressure-plate is connected and the supporting-stems permit the plate to yield slightly when the belt is brought over an uneven surface, thereby preventing any excessive wear on the belt. The spring connection between the heads and the supporting-bar also causes the pressure-plate to be held against the belt at all times with a yielding pressure. 7

While the machine is designed especially for using a sandpaper belt and for operating upon plane surfaces of wood, it is adapted for using any kind of rubbing or polishing belt and for operating upon any material.

It will be seen that the pressure-plate may readily be detached from the bars that are pivotally supported on the lower ends of the stems, and I find it advantageous to provide pressure-plates of different lengths, any one of which may be employed, according to the length of the article to be finished.

I do not limit myself to the details of construction, as the same may be varied in many particulars without departing from my invention.

I claim as my invention 1. The combination, in a machine of the class described, with a rubbing and polishing belt and means for driving said belt, of a pressure-plate arranged within said belt and in proximity to the operating portion thereof, a supporting-bar, connections between said plate and said bar, pivoted levers connected with said bar, and means for operating said levers, thereby pressing said plate against said belt, substantially as described.

2. The combination, in a machine of the class described, with a suitable work-supporting table, of a rubbing or polishing belt arranged to operate upon the material supported upon said table, a pressure-plate arranged within said belt and in proximity to its working portion, a supporting-bar, yielding connections between said plate and said bar, pivoted levers supporting said bar and an op erating-rod controlling said levers, substantially as described.

3. The combination, in a machine of the class described, with a suitable Work-supporting table, means for raising said table and means permitting said table to be moved horizontally, of a rubbing or polishing belt arranged to operate upon the material supported upon said table, a pressure-plate arranged within said belt and in proximity to its working portion, a supporting-bar, yielding connections between said plate and said bar, and operating-levers for raising and lowering said bar and said plate, whereby the plate may be pressed against the belt, substantially as described.

4:. The combination, in a machine of the class described, with the rubbing or polishing belt, of the pressure-plate arranged within said belt and in proximity to its workingportion, a supporting-bar, pivoted stems supported upon said bar, detachable connections between said plate and said stems, and means for raising and lowering said bar, substantially as described. 5. The combination, in a machine of the class described, with the rubbing or polishing belt, of a bar arranged within said belt, pivoted levers supporting said bar, pivotalyielding connections between said bar and said pressure-plate, and a counterbalanced operating-rod for moving said levers.

6. The combination, in a machine of the class described, with the pressure-plate 28 and the bar 26, of the stems 27 adjustably supported in said bar, the heads 31 secured upon said stems, the bars 30 pivotally connected to said heads, the springs 32 between said heads and said bars, and the adjusting-screws 33, substantially as described.

7. The combination, in a machine of the class described, with a rubbing or polishing belt and means for operating the same, of the work supporting table provided with the threaded shafts 55, extending parallel with the edges of the table and at opposite sides thereof, means for operating said shafts, the work-holding bars 60, and suitable connections between said bars and said shafts, for the purpose set forth.

In witness whereof I have hereunto set my hand this 20th day of October, 1903.

CHARLES S. YARNELL.

In presence of A. 0. PAUL,

G. G. HANSON.

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