US1819408A - Rotary hone - Google Patents

Description

Aug 3931 w. R. CHERMACK 1,819,408

ROTARY HONE Filed Nov. 23, 1929 3 Sheets-Sheet 1 Aug; 1931- w. R. CHERMACK 1,819,408

'ROTARY HONE Fild Nov. 23. 1929 3 Sheets-Sheet 2 1 H van for Mnclw fi 6%???72126'5 Bygg n Y A iomey Aug. 18 1931. w. R. CHERMACK ROTARY HONE Filed NOV. 23, 1929 3 Sheets-Sheet 3 I Mnclow E .U/zermav? A iiorhey 25 by providing one which is 735 tion and drawings.

I operable expanding Patented Aug. 18, 1931 GFFICE WINGLOW R. CHER-MACK, OF HOPKINS, MINNESOTA ROTARY HON'E Application filed November 23, 1929. Serial No. 409,351.

This invention relates'to improved tools which may be conveniently entitled a rotary hone, and it has more particular reference to a structure of this type which is employed 5 for the purpose of reconditioning the interior of cylindrical bodies, such as automobile engine cylinders, pump cylinders, and in fact cylinders of all types.

Briefly described, the invention has refer- 1 ence to a tool of this class which embodies, among other parts, a rotary propelling shaft provided with a plurality of circumferentialfly spaced eccentrically pivoted honing stones, and means of a yieldable nature for 15 maintaining said stones in yieldable contact with the surface being treated, said means serving as an automatic adjusting and tensioning device for the stones.

I amaware of the fact that it is not broadly if 29 new to provide a reconditioning toolof this type in the nature of a. structure including .a honing stone. My principal aim is therefore, to: generally improve upon known patented and marketed tools of thesimilar class, characterized by a novel arrangement of parts, mechanically associated and cooperating in securingthe production of a more'practicable tool which will fulfill the requirements of a device. of

this-class in a highly satisfactory and efficient manner.

The specific elements, and their mechanical relationship or coordination will become-more readily apparent from the followingldescrip- In. the drawings: Figure 1 isa top plan view of a; hone constructecl in accordance with the present invention, showing the manner in which it is used.

Fig. 2 is a longitudinal sectional view taken approximately on the plane of the line 2-2 of Fig. 1. i

Fig. 3 is a detail view of the central portion ofthe structure including the automatically elements- 7-. Fig. 4: is a horizontaldetail section taken approximately on of Fig. 2.

Fig. 5 is a cross section on the line 55 3 50 of Fig. 3.

the peripheral the plane of the line H Fig. 6 is a cross sectionion the line 6-6 of Fig. 3.

Fig. 7 s. a

bottom plan view of the structure seen in Fig. 3.

. Fig. 81s a fragmentary p one of the stones.

propelling shafts 11 respectively.

These plates are of the top plan configuratmn shown in Fig. 1. The swingably mounted hones generally designated by the reference characters 12, are

mounted between these plates and in radially spacedzrelation. from the concentric shafts 9. I have found it expedient toprovide a roup of hones, and each one is tion and comprises nel-shaped holder wedge-shaped honlng stone 14 and suitable retention clamps 15.1 At opposite, ends five of these swingably mounted thesame in construca carrier including a'chan- 13 (see Fig. 4:) for the e'ccentrica-lly mounted on the head plates .andll-respectively,

swing edge portions of said plate. these hones aresubstantially plete hone to Incidentally,

thus allowing the combodily with respect to self-adj usting and are maintained in constant yieldable contact withqthe internal surface of thecylinder 18 as seen in Fig. 1.

Moreover, the edge portions of the plates 10 and 11 are notched out to clearance for the swinging action of the hones.

The car- I riers include inwardly projected flanges formed "with converging inclined". edges 19 and 20 as seen in' cams.

Fig. .2 which function as Thesevcammed edges are cooperable with conical expanding elements 21 and :22 'slidablymounted on the shafts and engag-:

ing the edges 19 and 20 as seen in Fig. 2.

coiled, spring .23 and bears at its standards. I also In this connection, Ijcall which surrounds the opposite ends against the attention to a shaft desire to mention the diaerspective View of i provide outstanding lugs 16 provided with pintles 17 which are changing their active relationship,

metrically opposite guide slots 24 formed in the shaft.

At this time, I invite attention to Fig. 3, wherein it will be observed that the reference character 25 designates an adjusting screw which is cooperable' at its opposite ends, with spider-like followers generally designated by the reference characters 26 and 27 respectively. The upper follower includes a central washer 28 cooperable with the headed ends 29 of the screw, and provided with diametrically outstanding arms 30 which project through and beyondthe slots and engage the narrow end portion of the adjacent expander 21.

The lower end of the shaft is screw threaded as at 31 and cooperates with the screw threads formed in the central opening of the lowermost washer 32. This washer is also provided with outstanding guide arms 33 to function as keys and engage the lower expander 22. It will be noted that these expanders are disposed in reversed order. Thus, the expansion of the spring serves to hold the expanders in engagement with the respective followers 26 and '27 as seen in Fig. 3.

However, by adjusting the rods, the followers are drawn toward each other to move the expanders 21 and 22 toward each other against the tension of the spring, thus to bring about greater or less pressure on the cam edges 19 and 20 for the respective bones.

The gist of the invention is in the provi- 'sion of the tubular drive of propeller shaft carrying a longitudinally spaced head, constituting a. honing for the eccentrically pivoted swingable carriers of the quintet of hones.

The natural expansion of the expanders 21 and 22 maintains a constant pressure on the flange portions of these hones, and thereby maintains the honing blocks or stones in proper contact with the interior surface of the cylinder, as seen in Fig. 1. In this way, the hones are automatically adjustable and yieldably maintained in place.

From the foregoing description and drawings, it will be seen that I have evolved novel structural arrangements of parts, which when associated as shown and described, will fulfill the requirements of a tool of this class in a highly satisfactory and practicable manner.

' It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the same, after considering the drawings and description. Therefore, a more lengthy description'is regarded as unnecessary.

'Minor changes in shape, size, and rearrangement of elements, coming within the field of invention claimed, nay be resorted to in actual prac' ce if desired.

engageable by the expanders Having thus described my invention, what I claim as new is 1. In a cylinder hone of the class clescribed, a shaft, a pair of longitudinally spaced mounting plates of disk-like form mounted on said shaft, a plurality of circumferentially spaced honing devices, each device comprising a holder, a stone fastened in said holder, an inwardly projecting flange having converging cam edges, a pair of outstanding lugs, pintles carried by said lugs and eccentrically pivoted in bearing openings in said plates, automatically operable expanding means cooperable with said cam edges and mounted on said shaft, and embodying a pair of shiftable longitudinally spaced spring-pressed conical expanders and adjustable stops foriimiting the movement of the said expanders away'from each other.

2. In a cylinder hone of the glass described, a shaft, a pair of longitudinally spaced mounting plates of-disk-like form mounted on said shaft, a plurality of circumferentially spaced honing devices, each device comprising a holder, a stone fastened in said holder, an inwardly projecting flange having converging cam edges, a pair of outstanding lugs, pintles carried by said lugs and eccentrically pivoted in bearing openings in said plates, automatically operable expanding means co-operable with said cam edges and mounted on said shaft, and embodying a pair of longitudinally spaced conical expanders, a spring yieldably urging the expanders away from each other, adjustable stops for limiting the movement of the said expanders away from each other, and an adjusting screw connected with said stops for adjusting the stops toward each other to bring said expanders toward each other against the tension of the spring.

3. In a structure of the class described, a rotary propeller shaft provided with diametrically opposite slots, a screw threaded bolt arranged centrally in said shaft, a pair of longitudinally spaced followers functioning as stops and including central washers and outstanding arms, said arms projecting through and beyond the slots, 'a'pair of conical expanders surrounding and slidable on said shaft, a spring surrounding the shaft and hearing at its ends against the inner ends of said expanders in a manner to force said expanders into engagement with the arms of said followers, and a plurality of adjustable honing devices arranged circumferentially around the shaft and operatively for adjustment thereby.

In testimony whereof I affix my signature.

WINCLOVV R. CHERMACK.

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