US1927594A - Cylinder ridge reamer - Google Patents

Description

p 1933- c. A. OLSON 1,9

CYLINDER RIDGE REAMER Filed May 11, 1951 I $iu ulmu w k MIIIIMHIME I? /i 052% (0% W/ 6672 $0022 Patented Sept. 19, 1933 CYLINDER RIDGE REAMER Carl A. Olson, Clarinda, Iowa, assignor, by mesne assignments, to Lisle Corporation, Clarinda, Iowa, a corporation of Iowa 7 Application May 11, 1931. Serial No. 536,522

5 Claims. (01. 77-76 The object of this invention is to provide an improved construction for a tool for easily, quick ly and accurately removing a ridge or ledge from a cylinder whereby the walls of the cylinder may be uniform in contour throughout their length.

A further object of the invention is to provide an improved cylinder reamer especially designed for use in trimming off 'a ledge or projection formed at the upper end of the cylinder ofan internal combustion engine because of the fact that the uppermost piston ring does not travel entirely to the top of the cylinder bore and the wear from ordinary usage consequently does not extend entirely to the top.

Still another object is to provide a cylinder ridge reamer which is capable of beingf'expanded for operation on cylinders of various diameters and which is so arranged that the expansion takes place uniformly on radial'lines.

Another and further object of the invention is to provide improved means for adjustment of the cutting tool and of the stop means for terminating the operation of the tool in conformity with the contour of the worn portions of the cylinder wall.

With these and other objects in view my in vention consists in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawing, in which:'

.Figure l is a perspective View of my improved cylinder ridge reamer.

Figure 2 is a vertical section of the same on the line 2-2 of Figure 1, and illustrating the tool in position for use.

Figure 3 is a horizontal section on the line 3-3 of Figure 2.

Figure 4 is a sectional view showing a piston in its cylinder and illustrating the condition which my improved tool is designed to relieve. I

The wear on the wall of a cylinder such as 10 is not'usually uniform in a direction circumferentially of the cylinder wall,nor in a direction longitudinally of the bore. The piston 12 in its travel often causes the cylinder wall to be worn to an out of round condition and furthermore a ridge or ledge such as 14 isleft at the top of the cylinder bore because of the fact that the uppermost'piston ring 16, which is expanded resiliently against the cylinder wall, does not travel entirely to the top of the bore. 7 Before installing a newpiston in a cylinder or new rings on an old piston, it is necessary to remove the ledge or ridge 14 in order thatthe pis-' ton and its rings may be properly fitted and in order to avoid any click or knock which would be occasioned by engagement of the new ring 16with the ledge. 1

The ordinary method of removing the ledge orridge such as 14 has been'by the use of a hand tool or by rubbing with abrasive material. This such a method to make the upper end of the cylinder bore conform to the remaining portions of the cylinder wall because, for, one thing, the

cylinder wall is not always Worn to true cylin-.

to the curvature of the remaining portion's orv in other words, those portions which have been wornby travel of the piston and its rings.

The body of the tool includes a top plate 18 and a bottom plate 20 which are of substantially conical form and arranged with their points di-,

'rected toward each other and variably spaced apart. For adjustably connecting theplates l8 and 20 I employ a series of rods 22, in this instance three in number, which are fixed at their upper is slow work and furthermore, it is difiicult by ends to the top plate 18 and which pass slidably through the plate 20. u 1

A series of carriers are movably mounted between the head platelB and base plate 29 and are formed tapering at; their ends for engagement with the opposed conical surfacesof said plates. Two of the carrier members are alike in construction and are designated by the numerals "24'and 26, but the other carrier member. 28 is slightly different. Each carrier member is formed at its.

upper end with a reduced tongue 30 engaging slidably in a groove 32. in the lower surface of the topplate 18 and each carrier, is formed at its lower end with a tongue '34 engaging in a groove 36 in the upper surface of the bottom plate. It will be observed that these tongue and groove connections are on inclined lines relative to the axis of the device and that this permits an expansion and contraction of 'thecarriers relative to the conical top and bottom plates by radial outf ward and inward movement.

The head plate 18 and bottom plate 20 arefurther connectedby a screw headed bolt 38 upon the threaded lower end of which is-mounted a nut 40. The head of the bolt 38 is located .in an angular-recess 42 opening to the top of the plate 18, and this recess isadapted to receive asuit able tool such as44 by means jof which the devicev may be manuallyrotated.

In the lower surface of the b ottom plat'e20 is formed an angular recess l6 adapted to snugly receive the nut 40 and prevent rotary movement thereof. An expansion spring 48 i's' mountedon the bolt 38 within the recess 46 and behind'the" nut 40. If desired, a pin .50 maybe mounted through the lower end of the bolt to prevent accidental removal of the nut 40. v

The carrier members 24 and 26 are formed with outwardly opening recesses 52 within which rollersv the ledge or ridge 14 at the top of the cylinder.

The other carrier member 28 is formed with a smaller laterally opening recess 60 within which a roller 62 is journaled on a vertically extending pin 64. The roller 62 is adapted to travel entirelywithin the cylinder and in contact with its wall. I

The carrier member 28 is also formed in its outer face with an angular recess 66 in which a cutter blade 68 is mounted, said blade being backed by an expansive spring 70 mounted in'the inner end of the recess. ting edge of the blade 68, which is vertically arranged, to be projected slightly beyond the wall of the carrier member. t

A stop member 72 is disposed at the outer. side of the carrier member 28 above the cutter blade 68 and is formed of a vertically arranged plate through which a threaded screw 74 is loosely mounted. A laterally opening threaded bore 76 is formed in the carrier member 28 and within this boreis threaded an adjusting screw 78 which ishollow and internally threaded to receive the screw 74. The adjusting screw 78 is adapted to I be engaged at its outer end by the'stop plate 72 when the screw 74 is tightened up. The screw 78 is formed at its outer end with a screw driver slot 80whereby it may be adjusted in 'the'threaded bore 76; v

The carrier member 28 is formed with an upwardly opening threaded bore 82 which intersects the bore 76. In the bore 82 is mounted a set screw 84.adapted to engage the hollowadjusting screw 78 and hold it in adjusted position. When the stop plate 72 is .drawn'up tightly against the outer end of the adjusting screw 78 by means of the-screw 74 it forms a positive stop means which is adjustable and yet is held rigidly in any selected position of adjustment.

The stop plate 72 overlaps at. its lower end the upper edge of the cutting blade 68 and serves to limit outward movement of the blade under the influence of the spring 70. v

The hollow adjusting sc'rew 78 is set in such p0 sition that its outer end is in vertical alignment with the periphery of the roller 62 and is held in such adjustment by the set screw 84. The position of the screw 78 is not ordinarily disturbed ex cept to compensate for wearand it thus serves to govern the position of the inner face of the stop plate 72 in line with the roller 62 for forming a stop'for the cutting. blade68, which will conform to the position of said roller.

1 The carrier members-24,j26 and 28 areyield ingly held in position with respectto thehead plate 18 and bottom plate 28 by meansof a pair of endless coil springs 86 and 88 encircling said carrier members and preferably mounted in transverse grooves 96 formed in their outer faces.

In practical use the tool isplaced in position within the upper end of the bore of a cylinder and a screw driver or the like is employed for expanding the tool by tightening the bolt 38, it be ing understood that the nut 40 on said bolt is held against rotation by engagement in the re- 'cess 46. The tightening of the bolt 38 causes the Each roller 54 is The spring causes the cut-- peripheries of the rollers 54 and 62 engage the inner wall of the cylinder and then is continued somewhat past that point, thereby relieving the tension on the springs 86 and 88 and placing the spring '48 under tension.

The tool'is supportedwith respect to the cylinder lll'byi means of the flanges 58 on therollers 54 and also by the stop plate 72 which engages the top of thecylinder wall. In this position the rollers 54 and 62 are in engagement with the worn portion of the cylinder wall and the point of the cutting blade 68 restsagainst. the ridge or ledge 14 atthe upper end of the cylinder and is forced thereagainst by action of the spring 70.

Rotary oscillation .is then imparted to the reamer manually by the use of the wrench or tool 44, thereby causing the blade68 to cut and ream away the projecting ledge 14. The contact ofv the cylinder causes the blade 68 to conform to the contour'of the cylinder wall sothat said blade cuts away the projection 14in conformity with such contour. of the roller 621s in exact vertical line'iwith the inner face of the stop member 72, it follows that this cutting operation will be automatically terminated by contact of the blade with the inner face of said stop member, when the projecting ledge has been cut away to the proper amount to conform exactly with the wornoylinder wall.

This is true even though the contour of theworn wall may not be exactly cylindrical, inasmuch as the tensioniof the spring 48 causes the roller 62' c to travel at all times in exact contact with. the

worn cylinder wall and the spring 70 causes the blade 68 to be thrust outwardly to perforrnits work. 7 In other words the carrier members 24 and 26which are provided with therollers 54 and the carrier member 28 which is provide-d with the roller 62and stop 72,are forcibly expanded within the cylinder so thatthe roller 62 is caused to follow accurately the cylinder wall and to determine the position of the stop member 72 against which the cutting blade 68 is engageable at the limit of the cutting operation.

The reamer is very easily operated by manipu lating the wrench or hand tool 44 so that the projecting ledge 14 is easily andv quickly cut away conform to the worn part of the wall below it; It

Inasmuch as the outer periphery will be observed that the angular opening for the tool 44 is always located at the axial center of the reamer because, the. carrier members for the rollers and cutting: blade are radially arranged about theaxis of the tool and are caused to move uniformly on radial lines.

While the enlarged flanges 58 on the upper ends of therollers 54 .form a convenientmeans for supporting the reamer with respect to the cylinder, yet I do not wish to be understood as limiting myself to this particular ,means inas-' much as equivalent supporting means may be employed if desired." I f y Considerable expansion of the reamer for work on cylinders of differentv diameter may be obtained because of the tapered formation of the heads 18 and 20 and the carrier members 24, 26 and 28. The inclined tongue and groove connections between these members permits easy slid.-

ing movement of the carrier members in expanding and contractingthe reamer to the desired diameter.

This tool has been especially designed for use on cylinders of internal combustion engines, but

it is obvious that it may beapplied in connection with any cylinder thathas a similar projecting portion to that indicated by the numeral 14, and I do not desire to be understood as limiting myself to the exact method .of use or the particu having oppositely inclined faces on their adjacent sides, a plurality of carrier members having inclined faces contacting with the faces of said heads, resilient means acting to hold said car'- rier members in place between the heads and tending to move them inwardly whereby said heads are forced apart by mutual engagement of said inclined faces, rollers pivoted on said carrier members, a bolt having a threaded connection for adjustably connecting said heads, a spring means adapted to be placed under compression by tightening movement of said bolt when the carrier members are confined against outward movement, thereby yieldinglyforcing said rollers into engagement with the surface of p a cylinder within which the reamer is operated, a blade slidably mounted in one of said carrier members, a spring acting to move saidblade outwardly for operation on a partof the cylinder wall, and a stop means for limiting outward movement of said blade whereby to limit its cutting operation to conform to the surface'engaged by said rollers, said stop means including a hollow screw threaded in the last named carrier member, a stop plate, and a screw for holding said plate against the outer end of said hollow screw.

2. A cylinder ridge reamer comprising a pair of substantially conical heads arranged with their bases away from each other, a plurality of carrier members each having inclined ends in slidable engagement with the conical surfaces of the respective heads and movable on substantially radial lines, rollers pivoted on vertical axes on said carrier members adapted to engage a cylinder wall and travel thereon, a bolt extendingadjustably through, said heads and having a threaded connection adapted to be tightened for drawing said heads together and thereby forcing the carrier members outwardly, yielding means adapted to be placed under compression by such tightening and tending to force said carrier members and rollers outwardly, stop means carried by one of said carrier members in a position conforming to the periphery of its roller, and a yieldably mounted blade carried by the last named carrier memberfor engagement with a portion of the cylinder wall and limited in its movement by said stop means, whereby the cutting operation of said blade will be caused to conform to the contour of the surface engaged by said roller. 7

3. A cylinder ridge reamer comprising a pair of substantially conical heads arranged with their bases away from each other, rods on one of said heads extending slidably through the other, a plurality of carrier members each having inclined ends in slidable engagement with the conical surfaces of the respective heads and movable on substantiallyradial lines, rollers pivheads are forced apart by mutual engagement of in which the reamer isoperated, a bladeon one oted on vertical axes on said carrier members adapted to engage a cylinder wall and travel thereon, a bolt mounted slidably through said heads, anut having a threaded e'ngagementwith said bolt and held against rotation, a spring on said bolt adapted to be placed under compres sion by tightening'movement of, the bolt when said carrier members are confined against'outward movement, said'spring tending to move said rollersoutwardly into contact with the cylinder wall, and permitting them to-move inwardly under pressure, a blade carried by the last named carrier member for engagement with a portion Q of the cylinder'wall and means to limit the cutting operation of said blade so that the cut" will be caused to conform to the contour of the surface engaged by said roller. 7 a p 4. A cylinder ridge reamer comprising a pair of spaced relatively movable heads having oppositely inclined faces ontheir adjacent sides, a a

plurality of carrier members having inclined faces contacting with the faces of said heads, resilient means acting to hold said carrier mem-'- bers in place between the heads and tending to move them inwardly on radial lines, rollers rotatably mounted on said carrier members, a bolt affording an adjustable connection for drawing said heads together and thereby exerting outward pressure on the carrier members; resilient means adapted to be placed under compression by tightening movement of said bolt whenthe carrier members are confined against outward movement, thereby yieldinglyforcing said roll ers into engagement with the surface of a cylin- 1 der within which the reamer is operated, a blade slidably mounted in one of said carrier members, yielding means acting to move said blade outwardly for operation ona part of the cylinder wall, and stop means for limiting outward movement of said blade whereby to terminate its cutting operation in conformity to the'surface en'- gaged by said rollers, s'aidstop means including a hollow screw threaded in the last named carrier member, a part atthe outer end of said screw adapted to be engaged by said blade, and Q of spaced adjustably connected heads, said heads' having oppositely inclined faces on their adjacent sides, a plurality of carrier members having inclined faces contacting with the faces of, said heads, resilient means acting to hold 'said carrier members in place between the heads and tending to move them inwardly whereby said said inclined faces, guides on'said carrier members, a bolt having a threaded connection for adjustably connecting saidheads, spring means adapted to be placed under compression by tightening movement, of said bolt when'the carrier members are confined against outward .movement, thereby yieldingly forcing saidguides into engagement with the surface of a cylinder withof said carrier-members yieldingly forced out wardly for operation on-a part of the cylinder wall, and a stop member, the guides, blade and stop member being so constructed and arranged as to limit the cutting operation of the blade to conform to the surface engaged by said guides.

CARL A. OLSON.

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