US1560507A - Grinder - Google Patents

Description

Nov. 3,1925. n 1,560,507 A. F. FRQUSSARD GRINDER Filed4 Nov. 5, 1923 2 Sheets-Sheet l Patented Nov. 3, 1925.. Y

UNirEDTArEs PATENT n ALBERT F. FBOUSSARD,

. yGiannina.

0F ST. LOUIS, MISSOURI.

To `all 'whom it may concern:

Be it known that I, ALBERT a citizen of the United States, 4residing at the city of St. Louis, in the Stateof Missouri, have invented certain newand useful Improvements in Grinders, of which theI following is a specification.

This, invention relates to grinders for polishing the internal,y cylindrical surfaces of internal lcombustion-engines vand ,the like, and pertains more particularly to improvements in that type oy grinder which forms the subject-matter of my prior application for patent, Seriall Number 627,267, filed March 24, 1923.

One of the objects of the present invention v is to provide improvements in the Grinder head, which will simplify its manuacture and materially lowerthe costs of its production.

Another object `is to provide a novelmeans for extendin the abrasive blocks diametrically, thereby adapting a single sizefgrinder to cylinders of widely varying diameters, and, also, enabling the use of the abrasive blocks after they have become worn to such a degree that ordinarily they would have been discarded. 4

A further object is to provide a -novel means for coupling an extensionl or lengthening rod to the grinder-head shaft 0r spindle. f

Other objects and advantages will appea as the description proceeds. g A

In the -accompanying drawings forming part of this specification, in which like numbers of reference denote like parts wherever they occur,

Figurel 1s a transverse section taken `on the line 1-1 of Figure 2; V

' Figure 2 is an elevation of the complete grinder and extension rod;

Figure 3 is a' transverse section taken on the line 3--3 of Figure 2;

Figure 4 Jis a transverse section taken on the line 4-4vof Figure 2; Figure 5 is a transverse section taken on the line 55 of Figure 2; Figure 6 is a longitudinal central section; taken perpendi'cularly to Figure 2;

. Figure is a transverse section taken'on' I the line 7-7 of Figure 6;

Figures 8 and. 9 are fragmentary' y:front land side elevations, respectively, showing an extension applied to an abrasive block; and

F. FnoUssARn,

ingl an opening 29, for the passage Figure l() is a transverse section taken on the line 10.-10 of Figure v8. f

A vertical spindle lconsists of an upper portion 2 of hexagonal cross-sectioman intermediate cylindrical portion 3, a portion 4 of square cross-section nnear its lower extremity, a cylindrical portion 5 between portions 2 andI 3, and 'cylindrical portions 6 immediately adjoining the square portion 4 at each of its ends. Rectangular retainer G5 7 for abrasive block 8 are formed, each of a single piece of sheet metal, bent to a channel shape, havingtwoiparallel side walls 9,

connected by a perpendicular inner' wall 10, and having an open outer side 11, restricted `by inwardly extending ianges 12, projecting perpendicularly from the side walls 9.,` The retainers 7 have v45 degrees bevels 13 on their inner edges, and are secured to the square portion 4 of the spindle 1 by screws 'i 14, litting'tapped holes 15 in the-portion 4, the beveled edges 13 of the several retainers 7 being in contact with one another, whereby tliey mutuallyretain-one another against angular movement about the screws 14. The cylindrical portionsl 6 are of Asmaller diameter than the square portion 4 and have rexternalthreads 16 for the reception ofnuts 17. cylindrical shell 18, having a bottom wall 19, containing a concentric c lin- ,S5 drical aperture 20, for the reception o the Aupperofy the cylindrical portions 6, isi

clamped between upper nut 17 and shoul.- A der 21, Jforming the\upper terminus of portion .4. The` lower face of wall 19 is pro- 90 .'yided with projections 22 and depressions 23. The projections 22 lit closely between the retainers 7 whose ends are held'within the depressions 23. A plate 24, containing a concentric cylindrical aperture 25, for the reception of the lower ofthe cylindrical portions 6,xis clamped between lower nuts 17 and shoulder 26, forming the lower terminus. of por-tion' 4. The upper face of Lplate24, also, has projections 22 and de- 100 .pressions 23, which function similarlyv to those on shell 18 t engage the )lower end of the retainers 7. Shell 1 8 and plate 24 close the open endsof the retainers 7, and

, prevent longitudinal movement of the blocks L8. Shell 18l is adapted to contain kerosene` or other lubricant, whichl is e'xuded through ports 27 by Icentrifugal force when the gninderis in rapid rotation. A cap 28, havof the no movement imparted to said blocks by compression springs 34, interposed between each pair of diametrically opposed blocks Sand held in passages 35 in the spindle 1 and corresponding-passages 36 in the inner walls l0 of the retainers 7. The blocks 8 are pro# l tected from the cutting action of the springs 34 by shields '37 interposed between said spring 34 and blocks 8. -The shields 37 are preferably formed of sheet metal and have perpendicular projections or tits 38. The blocks 8 can be withdrawn from the retainers 7 at the lower end after plate 24 has been removed, but the shields 37 are retained in the retainers 7 by the engagement of the tits 38 with the springs 34. The blocks have rounded grinding surfaces 39, which conform Lto the internal surfaces of the cylin-4 ders to be ground.

To 'enable the grinder to accommodate a wider range of cylinder diameters, extensions 40 for the blocks 8 are provided, as

shown in Figures 8, 9, and 10. These eX- tensions are preferably formed of sheet metal and consist substantially .of two side 'walls 41 connected 4*by an inner, wall 4 2.

The side walls 41 are bent outwardly at their inner ends Hto form flanges 43, which contact with the flanges 12 of the retainers 7, 40

and'theeby limit the outward movement of said extensionsl by the action of the compression springs 34. The 'free ends of the walls 41 are bent to form channels 44, adapted to receive they anges 33 of the blocks 8, and prevent transverse movement of the blocks 8 with respect to the extensions 40. The .extensions 40 are of the same length as the blocks 8, except at the channels 44, which project beyond the lends' of the extensions 40 to receive the-,cross-member 45 and tube 46. Cross-member 45 has shoulders'47 formed by reducing the ends' 48, which extend through holes 49 in the channels 44, and are peened over against the outside of the channels 44, rivet fashion, clamping the channels 44 against the; shoulders .47. A screw 50 passesthroughl holes 51 in the other ends of the channels 44 and through spacing tube 46, and is pro"- vided with a nut 52, which is screwed against f the outside of one of the channels 44, and thereby clamps the said channel against the end of the tube 46, and the other channel.. between the head 53 of the screw 50 and` 1 the other end of the tube 46. Both crossmember 45 and screw 50 strengthen and stiffen the extension 4Q, and, also, serve as stops to prevent longitudinal movement of blocks 8 in extensions 40, cross-member 45 forming a permanent connection and screw 5() a removable connection to permit removal of block 8 ,for replacement`V or other reasons. Extensions 40, also, prolong the useful life of the abrasive blocks 8, by enabling them to be extended after they have become worn to such an extent that ordinarily they would have to be discarded.

The cylindrical portion 5 of spindle 1 is of smaller' diameter than the portion 3,/ forming a shoulder 54. A pin 55 passes transversely through part 5, and is secured therein by a tight it, its ends projecting therefrom at dia-metrically opposite points. In grinding the cylinders of certain types of engines, it occurs that the spindle 1 is of insufficient length to enable the grinder head to reach the bottom of the cylinder, and an extension or lengthening rod 56 must be employed, as shown in Figures 2, 6, and 7, thev socket of the motor shaft being connected to the hexagonal shaped end 57 of the rod 56, instead of directing to the hexagonal portion 2 of the spindle 1, asis usual, when the extension 56 is not used. The cylindrical portion 5 8 of rod 56 has a concentric cylindrical recess 59 at its lower end, forming a tubular portion 60 to receive p'ortions 2 and 5 of the spindle 1. lend ofA tubular portion 60'is split at diametrically opposite points by longitudinallyextending slots 61, having their upper ends The lower communicating with slots 62, which extend from vslots 61 in a counter-clockwise direction and at a slight incline "from the horizontal, looking from the top of the rod 56. In connecting rod 56 to spindle .1, portion 60 is brought directly overu spindle 1 and pushed down, so lthat the projecting ends of pin 55'pass into the slots 61, until the pin 55 abuts against the top edges of the slots 62, after which lrod 56 is rotated in a' clockwise direction, causing the tongues G3 to become wedged between shoulder 54 and' the projecting ends of the pin 55, whereupon rod 56 and spindle 1 rotate as one unit in a clockwise direction, but become disengaged upon reversing the direction .of rotation.

V/The depth of travel of the rinder in the cylinder is limited by a sa ety stopping plate 64, adapted to engage the end of the cylinder and thereby prevent damage to the honer by running the same below the bottom of ^the cylinder. Plate/64 can be set on shank 11 togaccornmodateA 'different lengths of lcylinders byl a headlessy set screw 65.

Having' thus described this invention, I

hereby reservefthe benefit of all changes in form, arrangement, order, or use of parts, as it is'evident that many minor changes may be made therein without departing ran ' the said sides, and side plates extending perpendicularly from the said base plate and connected thereby, there being beveled outer faces at the base of said side plates, the said retainers being arranged contiguously to one another with the said beveled faces forming their common meeting faces. 2. In a grinder, thel combination of a spindle having a squared portion provided With crossed pairs of transverse passages, a retainer removably secured toeach face of thesquared portion of the spindle and having passagesV registering with one `pair of .the transverse passages in the spindle, an

abrasive block longitudinally removably positioned- Within each retainer, axially adjustably means' carried by the spindle for holding said blocks against removal, means in said pairs of registering passages for forcingl said blocks radially outwardly, and means carried by said retainers and blocks for restricting the radial movement of the latter.

3. In a grinder, the' combination of arotating head having a plurality of plane sidesy in its periphery, a plurality of retainers secured to the said sides, the said retainers each consisting of a base plate on the said sides, and side plates extending perpendicularly from the said base plate and connected thereby, there being beveled oute'r faces at the base of said side plates, the said retainers being arranged contiguously to one another with the said beveled faces forming their common meeting faces, and abrasive blocks removably carried by said retainers.

4. In a grinder, the combination of a ro-v tating head provided With a plurality of plane sides in its periphery, a plurality of retainers secured to the said sides, the said retainers each consisting of a base plate on the said sides, and side plates extending perpendicularly from the said base plate and connected thereby, there being beveled outer faces at the `base of said side plates, the

said retainers being arranged contiguously to one another with the said beveled faces forming their common meeting faces, abrasive blocks carried by the said retainers, means for forcing said abrasive `blocks radially outwardly of the rotating head, and means for preventing the blocks from accidentally being disconnected from the retainers.v

In testimony whereof I hereunto affix my signature.

ALBERT F. FROUSSARD.

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