US2002567A - Honing tool - Google Patents

Description

May 28, 1935. w CONNOR 2,002,567

' HONING TOOL Filed Jan. 8, 1934 INVENTOR. M77312 )4. (22777021 M ,JQ%/MM- EL ATTORNEYS.

Patented May 28, 1935 UNITED STATES PATENT OFFICE HONING TOOL Kirke W. Connor, Detroit, Mich, assignor to Micromatic Hone Corporation, Detroit, Mich, a corporation of Michigan Application January 8, 1934, Serial No."i05,664 Claims. (Cl. 51-4842)" My invention relates to honing tools and parbetter understanding of my invention, to the folticularly to a tool of the service type embodying lowing description taken in conjunction with the free floating abrading elements having wide exaccompanying drawing, wherein: pansion. Figure 1 is a plan view, partly in section, of a While honing tools of the service type have honing tool embodying features of my invention, 5

been constructed and employed heretofore, the Fig. 2 is a sectional view of the structure illustools have proven more or less unsatisfactory for trated in Fig. 1, taken on the line 2-2 thereof, various reasons, primarily because of the chatter- Fig. 3 is a sectional view of the structure illusing of the tool in the cylinders. Tools of this type trated in Fig. 2, taken on the line 3-3 thereof,

'10 are usually of the off-center construction to have Fig. 4 is a view in elevation of the spring em- V the pins of the abrading element extending bep y in thehoning o illustrated in yond the tool centerto provide the material ex- Fig. 5 is a top plan view of the structure illuspansion required in the tool. A service tool is trated in Fig. 4, and

one employed in garages for servicing all types g. 6 s a bottom P View Of the Structure of engine blocks and, therefore, requires a large illustrated in Fig. 4.: 15 range of expansion to meet the various sizes of er in to the honing 11001 is built o a cylinders employed in different automobile enrigid Sp yv h ay b round, q gines. octagon or other shape. Preferably- I employ In the present invention, I have provided a Shapes other than round or cylindrical to preservice tool which is exceedingly rugged in convent the rotation of certain parts of the tool andI 20 struction and which provides the required exhave herein illustrated a hexagon shaped spindle pansion necessary for such tools. The possito provide strength, clearance for the radial adbility of chatter occurring between the tool and lusting elements and to provide surfaces on which the surface of the cylinder wall during the grindcertain elements will not rotate.

ing operation has been entirely eliminated, pri- Upon the upper end of the spindle an adjust- 25 marily by having the elements foradjusting the ing body H is provided while on the lower end abrading elements radially float freely independthereof an abrading head 12 is disposed. The ent of the means for supporting and driving the abrading head is constructed of a plurality of abrading elements in rotation. By this construcabrading shoes [3 having a medial slot l4 therein tion, I am able to employ more of the abrading which is engaged by a positioning element I5 30 elements in the tool, in the small size four being which is fixed against longitudinal and rotationoperated, while in the larger size, as illustrated, al movement on the spindle ID by suitable means six of the abrading elements may be utilized herein illustrated as akey l6. thereby increasing the abrading action and 2.0- A pair of oppositely disposed spiders I! are cele'rating the abrading operation, while distribmounted for longitudinal movement on the 35 uting the wear on the stones more evenly therespindle l0 but are retained thereon against rotation preferably by having a hexagon aperture,

Accordingly, the main objects of my inventhe walls of which closely fit about the spindle tion are; to provide a honing tool having abrad- In. The spiders H are provided with a plurality 40 ing elements which are free to shift and tilt longiof slots 18 for receiving the shoes l3 and for 40 tudinally; to provide an abrading tool wherein driving them in rotation. The bottom of the the abrading elements are driven by a portion of slot is sloped, as at I9 as illustrated in Fig. 1, the tool in rotation independent of the radial adfor providing clearance to sloping surfaces 2| on justing elements which are free floating; to proeach end of the shoes l3.

vide. a honing tool having an adjustable head Each of the spiders I! has adj ustably retained 45 embodying a spring which applies a predeterthereon washers 22 the outer peripheral edges mined bias to the abrading elements to feed them 23 of which are sloped to mate with the sloping radially during the honing operation; to incorposurface 2i provided on the ends of the shoes l3. rate stop means in the spring to retain the head The central portion of the washer 22 is proin adjusted position; and, in general, to provide vided with an aperture 24 which is larger than 50 a honing tool which is rugged, positive in operathe spindle II) to permit a lateral movement of tion and economical of manufacture. the washer relative to the spindle. The washers Other objects and features of novelty of my are employed to adjust the shoes l3 radially when invention will beeither specifically pointed out the spiders H are moved longitudinally of the or will become apparent when referring, for a tool. The shoes l3 tilt about the positioning element l5 to provide free floating movement to the abrading head I2 independent of the driving means therefor. Spiders 25 are employed to cooperate with the spiders I! for retaining the washers 22 related to the spiders H by having the two sets of spiders l1 and 25 riveted together in a predetermined manner. a

The spiders 25 are provided with a plurality of extending lugs 26 which project outwardly of the washers 22 and are extended to engage the spiders IT. The spiders I1 and 25 at the lower end of the tool are retained in fixed relation by pins 21 having a shoulder 28 near each end thereof. The shoulder 28 near the lower end of the pin abuts against the top surface of the spider the pin extending through both of the spiders and being peened over at the end to secure the spiders in fixed relation. I have illustrated in the figure three of the pins 21 employed on the tool. It is to be understood, however, that more or less of the pins may be utilized.

At the top of the abrading head l2, the spiders l1 and 25 are riveted together by hollow rivets 29 through which the pins 21 are slidable. In

this manner the spiders H and 25 are retained in permanent fixed relation as a unit having the central portion spaced apart to receive the washers 22 which are slidable laterally therebetween.

The sides of the slots M in the shoes |3 may be sloped to provide clearance to permit the tools to tilt and at the same time prevent longitudinal movement of the shoes 3 relative to the positioning element IS. The shoes are provided with a channel 32 in which abrading sticks 33 are retained. The sticks comprise an abrading stone 34 mounted in a metal backing element 35 having projecting hook ends 36. The ends 36 receive garter springs 31 for retaining the abrading sticks 33 in the channel 32 of the shoes l3 and the shoes pressed against the surfaces 23 of the washers 22.

The upper ends of the pins 2'! are provided with the shoulders 28 which abut against the lower surface of. a nut 38 having a portion extending therethrough and riveted to the opposite side, at 39. In this manner, the nut 38 and the lower set of spiders l1 and 25 are held as a unit by the pins 21 and co-operate with the adjusting body II to effect the relative opposite movement of the upper and lower set of spiders for adjusting the shoes |3 radially of the spindle Ill.

The adjusting body includes an adjusting sleeve 4| comprising a handhold portion 42 and a threaded portion 43, the latter of which engages the threads of the nut 38, as illustrated in Fig. 1. The lower portion of the sleeve 4| is recessed to receive a spring 44 which engages the spider 25 at the top of the abrading head l2 for applying a downward bias thereto. The sleeve 4| is retained on the spindle by the tool supporting and driving connection 45 which is retained against rotation'by a pin 46. A bayonet slot 41 is provided in the element 45 .by which connection is made to a spindle which operates the tool.

A pin 48 is secured in the sleeve 4| for engaging one of a plurality of apertures 49 provided in one end of the spring 44. 44 fixed to the sleeve to rotate therewith. A plurality of apertures 5| are provided on the lower end of the spring which are successively engaged by a spring pressed ball 52 mounted in the top spider 25, as the spring is turned. Any adjustment set oil by the turning of the sleeve 4| is ret ained fixed through the engagement of the spring pressed ball with one of the apertures 5| of the spring.

This pin retains the spring As illustrated in Figs. 4, 5 and 6, the spring is of a peculiar type, being from a hollow cylinder having oiTset slots 53 therein for the purpose of providing a predetermined tension per unit deflection and to have the deflection and'tension follow a straight line curve or be in direct proportion at the initial loading and at the final expansion of the spring. Such a spring may be employed to retain the adjusting body I in adjusted position. This is afiected by the engagement of the pin 48 with an aperture in the end of thespring to cause the spring to rotate with the sleeve 4| and through the engagement of the spring pressed ball 52 and an aperture 5| provided in the opposite end of the spring.

A guiding plate 54 is retained on the end of the spindle In by a bolt 55 and is provided with tapered sides 56. The plate is employed to guide and aid in inserting the tool into a cylinder and to protect the abrading head |2 against damage.

When a cylinder is to be honed, the tool may be inserted into the cylinder when the abrading head I2 is in retracted position. The turning of the adjustingsleeve 4| by grasping the handhold portions 42 draws the nut 38 upwardly while a bias is applied downwardly by the spring 44 to the upper spiders l1 and 25 to cause the upward movement of the lower spiders l1 and 25 and the downward movement of the upper spiders l1 and 25. This movement projects the shoes l3 outwardly to cause the abrading stones 34 to contact with the cylinder wall.

Further adjustment applies a bias between the upper and lower sets of spiders through the compression of the spring 44 to urge them toward each other and in this manner the tool is retained fixed in the cylinder and is expanded during the machining operation. A suitable driving device is secured to the bayonet connection 45 by which the tool is operated in rotation and is so disposed as to be reciprocated at the same time. During the grinding operation the shoes l3 are permitted to tilt about the positioning element l5 in view of the lateral shift permitted to the washer 22 which engages the sloping surfaces 2| of the shoes. Through the adjustment of the shoes in this manner more pressure and abrading-is eifected on the cylinder walls at points out of round, or tapered, and in this manner the out of round portions are machined away more rapidly so that at the end of the operation a true cylindrical wall is produced.

While I have described and illustrated but a single embodiment of my invention, it will be apparent to those skilled in the art that various changes, omissions, additions and substitutions may be made therein without departing from the spirit and scope of my invention as set forth in the accompanying claims.

I claim as my invention:

1. A honing tool including, in combination, a spindle, spiders mounted on said spindle for movement to and away from each other, abrading elements carried, by said spiders for rotating said elements therewith, and means movable laterally of said spiders for efiecting the radial movement of the abrading elements when the spiders are relatively moved toward and away from each other, and means for relatively moving said spiders.

2. A honing tool including, in combination, a spindle, longitudinally movable spiders on said spindle, washers carried by said spiders and movable laterally of the spindle, abrading elements 3 carried by said spiders and engaging said washers, whereby the spiders eii'ect the rotation of the abrading elements and the washers eflect their radial movement independent of spiders.

3. A honing tool including, in combination, an abrading head, an adjusting body therefor for effecting the radial expansion of said head, a spring interposed between said adjusting body and said abrading head, and securing means engaging said spring for retaining the head in adjusted position.

4. A honing tool including, in combination, a spindle, an abrading head thereon comprising a plurality of abrading elements, means for eflecting the rotation of said elements, means laterally movable independent of the rotating portion of said head, for effecting the expansion of said elements, adjusting means for positioning said expansion means, a spring rotatable with said adjusting means, and means carried by said head in engagement with said spring for securing it in adjusted position.

5. A honing tool including, in combination, an abrading head, .an adjusting body for expanding the abrading head, a spring interposed between said head and body and dated to said body, and means engaging said spring to retain the head and body against relative movement.

6. A honing tool including, in combination, anabrading end, an adjusting end for expanding the abrading end, a spring interposed between said ends and rotatable with one of said ends, and means engaging said spring to retain said ends against relative movement.

7. A honing tool including, in combination, a spindle, a pair of relatively movable spaced spiders carried by said spindle, a laterally movable washer carried by each spider, abrading elements engageable by said washers and spiders to be rotated through the engagement with saidspiders and to be adjusted radially through the engagement with said washers when said spiders are relatively moved toward and away from each other, and means for relatively mov- 20 ing the spiders.

KIRKE W. CONNOR.

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