US2465627A - Cylinder ridge reamer - Google Patents

Description

March 29, 1949. H. A. BERKMAN CYLINDER RIDGE REAMER 2 Sheets-Sheet 1 Filed Nov. 20, 1947 fiderzZ arf M MM, 3 Wqff jl' i offi y' March 29, 1949. H. A. BERKMAN CYLINDER RIDGE REAMER 2 Sheets-Sheet 2 Filed NOV. 20, 1947 Patented Mar. 29, 1949 CYLINDER RIDGE REAMER Herbert A. Berkman, Chicago, Ill., assignor to Zim Manufacturing Company, a corporation of Illinois Application November 20, 1947, Serial No. 787,151

10 Claims. 0]. 77-43) In my prior application, now Patent Number 2,452,095, there is disclosed a -reamer to remove internal ridges at the upper ends of internal combustion engine cylinders, by means of a cutting tool that is automatically fed lengthwise of a cylinder while being rotated about the axis of the latter. The present invention relates to a tool of that type, and it has for its primary object to improve the same to increase its efllciency and to make it easier to mount the tool in a cylinder ready for a reaming operation.

In the reamer forming the subject of my aforesaid application the automatic feed of the cutting blade is caused by a screw shaft provided with a star wheel that is turned step by step as the blade support is revolved around the axis of the cylinder; the star wheel engaging a stationary pin once during each revolution of the blade support. In my prior reamer this pin lies on the side of the star wheel nearest the axis of the tool on an expansible means adapted to secure the tool within a cylinder. registering the star wheel with the pin before spreading the expanding means to press against the surrounding cylinder wall, the subsequent spreading action of such means serves to push the star wheel radially and thus shift the cutting blade in the same direction. If the pin be placed in the outer side of the star wheel, instead of 1 on the inner side, the length of the path through which the pin may travel (for a given angular movement), increases and smooth turning of the wheel results. is made, the pin can no longer serve to move the star wheel radially in the outward direction One of the objects of the present invention is to produce a simple and novel construction wherein the star wheel may lie inwardly from the actuating pin and yet be automatically adjusted in the radial direction upon the spreading of the expansible means to secure the tool in a cylinder.

In order that the blade support may be adjusted automatically when. the expansible securing means is expanded, the star wheel must first be registered with the actuating pin and then be held in that position while the expansion is taking place. My prior reamer requires the'use of one of the hands of the operator for'this pur- Therefore, by

However, when such a change pose and complicates the process of mounting the tool in a cylinder.

A further object of the present invention is to make it possible easily to lock the parts with the star wheel and the actuating pin engaging each other, before mounting the tool in a cylinder, and just as easily to unlock them again after the mounting has been effected.

In tools of the type under consideration the tool support is mounted on a disc or table, associated with the expansible means, for slidable movements in a radial direction; the tool support being locked against movement relative to such disc or table during a reaming operation,

but being loosened for initially adjusting the cutting blade in a cylinder.

One of the objects of the present invention is to produce a simple and novel locking means for the tool support to the table.

In my said prior reamer the blade support includes a second disc overlying and in permanent coaxial relation to the first disc or table, to

gether with a plate slidable radially of the discs and provided with means to carry the blade; a

screw device being provided to lock the plate or slide to the second disc.

A further object of the present invention is to produce a simple and novel construction whereby the means for locking together the disc and slidable plate members of the blade holder serves also to lock the blade holder to the stationary disc or table with the star wheel and the actuating pin therefor in registration with each other.

The various features of novelty whereby the present invention is characterized will hereinafter he pointed out with particularity in the claims, but, for a full understanding of the invention and of its objects and advantages, referfor the movable blade supporting means; Fig. 5 is a section on line 5-5 of Fig. 1; Fig. 6 is a section on line 6-6 of Fig. 2; Fig. 7 is a section on line 1-! of Fig. 5, but on a larger scale; Fig. 8 is a section on line 88 of Fig. 1, also on a larger scale; and Figs. 9 and 10 are perspective views of the cutting blade and its immediate support, respectively.

In the drawings the general construction of the tool is the same as in my said prior application, namely: a round table I provided with a central, upright, tubular stem 2; a long bolt 3 extends through the stem and table into screwthreaded engagement with a spider d below the table; flat shoes 5 are distributed about and cooperate with the spider to form therewith an expansible means to clamp the table firmly within an engine cylinder A; a disc 6, almost as large in diameter as: the table overlies the latter and has thereon a v hub 'I of polygonal exterior surrounding the stem,

with the head 8 of the bolt resting on top of the stem and overlapping the hub; a plate I0, slotted for the reception of hub I, overlies and is slidable on disc 6, and adjustably secured thereto bya screw II extending through a long slot I2 in the plate and into the disc; a rod-like handle I3 rises from the plate at a point remote from hub l; and a sturdy arm I4 overlies plate ill and is connected thereto by a hinge pin I5; a spring I6, behind the free end of arm I4, tends constantly to swing that end of the arm outwardly; a cam device I'I, positioned on the front or outer side of the free end of the arm, serves to press the, arm back against the resistance, of the spring; and tall post or column I8 rises, from the arm I4 about midway between the ends of the latter for. carrying the cutting means.

0f the elements just described, only the screw I I and the post I8 differ materially from the cor-I responding elements in my said prior reamer.

In the present construction, the post I8 is rectangular in cross section and has in the front or outermost side a recess I9 of such dimensions as to give the post the appearance of a long, narrow, deep, rectangular box standing on end; thin sections 2!} and ZI, forming the end walls of the box, bounding the recess at the top and bottom of the post, respectively. Fitted slidablyl in recessIQ is a block 22 much shorter than the vertical dimension of the recess. In the outer or front face of the block is a deep groove or channel 23 that extends throughout the length of the block. In this groove or channel is a flat cutter blade 24, shown as being held in place, by a screwthreaded pin 25; the pin being entered through one side of the block, passing through a hole 28 in thelolade and being screwed into that part of the block on the other side of the blade The pin has a few screwthreads 21 at the inner end thereof and is smooth throughout the remainder of its length to provide a bearing on which the blade may rock. v

A screw shaft 28 extends throughout thelengthd 0f the post and through ascrewthreaded passage:

29 extending vertically through the block behind. the groove or channel 23. On the upper end of. this shaft is a head andon the lower end, below wall section 2! of the post, is a star wheel 30, by which the-shaft is-kept in place. An upper. section 28 of the shaft, at least as long as the block 22, is left blank so that, when the block is raised to a predetermined upper limit, the screwthreaded connection with the shaft is interrupted. This prevents the workman from forcibly raising the block sohigh that something is apt to break.

4 As in my aforesaid prior reamer, the star wheel is turned step by step, as disc '6, with the parts mounted thereon, is rotated in the usual way; a

pin 3| being fixed to and rising from the upper 5 end of one of the shoes 5 and extending up through a radial slot 32 in table I, into which slot the upper end of that shoe projects.

In accordance with the present invention, the pin lies outwardly from the circular path which the center of the star wheel travels during the turning of disc 6; the outwardly directed arms of the star wheel, one after another and only one during each revolution of the disc, striking the pin during a reaming operation. The screw shaft 15 turns with the star wheel and, therefore, the blade ,carrying block 22 is moved up slowly, step by step,

as disc 6 keeps on turning.

The distance of the pin 3I from the axis of the reamer depends on the diameter of the cylinder within which the reamer is secured, as does also the distance of the cutting edge of the blade from that axis. Therefore, in order to effect automatic adjustment of the bladewhen the reamer is secured in place, I provide the lower wall 2I on post I8 with a depending lip 33 that lies outwardly fromthe pin during normal operation of the tool. When the reamer is to be insertedin a cylinder, the disc 6 is turned until lip 33 regis ters with the pin. Thereupon, when the shoes 5 are spread to cause them to be thrust against.v

a surrounding cylinder wall, the pin, acting on said lip, pulls slide) along with it; the slide.

having been unlocked beforehand. .The slide need then only be locked to disc 6 again to retain.

of course, that the-blade isheld back by cam de-' vice I1 so as not to touch the cylinder wall until the securing of the tool in the cylinder is com;

pleted; after which spring I6 is. permitted to swing arm I4 and the blade outwardly.

In order to get the full advantage of matic adjustment just described, it is necessary that looking and unlocking the slide and hold'- 4 5, ing disc 6 against turning relatively to the ex pansible, clamp means, while the reamer is being, mounted in a cylinder, bemadesimple and easy. This'I accomplish with screw II.

screwthreaded lower part I I and an upper part I I in the form of a deep'cup open at the top.

The upper part is somewhat larger in diameter than the lower part so that, as shown in Fig. 8,- 655 the former serves 'as the screw head to bear on the upper side'of slide I8 when the screw tightened. A washer 34 may be interposed be-v tween the slide and part II. Part N of thescrew has an axial bore '35, smaller in diameter-l 69,, than the 'borein' part II, extending'througl'r' the same. In-the-cup shaped part of the screw 1 isa plunger 36 that terminates in a part or stem 1 Slot reduced diameter which extends down through bore '35. Onthe u'pperend-of the plung:

aiis. a head 38 provided with'a kerf 39'to receive a screw driver. Between the-under side of this-: head and the top of the screw II is a compres sion spring 48. In table I is a hole M at the same radial'distance-from the axis of the tool as is the screw hole 42 in disc 6; The parts are so proportioned'that' when the disc 6 is turned" until stem 1 registers with hole 4|, the plunger device may be pushed down far enough to causethe stem to enter that hole and thereby lock 76 disc 6 tc-the table; In thecylindrical wall of,

the auto with means associated It will be seen that screw II comprises a the cup-shaped part of screw II is an L-shaped slot 43. On plunger 36 is a radial pin 44 that extends into the slot.

When the pin 44 is in the vertical arm of the slot, the spring normally holds the plunger device raised, as in Fig. 8, with its lower end clear of table I. With stem 3'! and hole 4| in registration, the plunger device may be pressed down until the stem enters that hole; and, by then turning the plunger device, the pin 44 enters the horizontal arm of slot 43, locking the plunger device in its down position and the disc 6 against rotation relative to the table. When the parts are in the positions shown in Fig. 8, the screw may be turned in either direction, thus permitting the slide In to be fixed to disc 6 or be left free to slide back and forth on the latter.

Assuming that in Fig. 8 the screw has been tightened, and that the reamer is to be inserted in a cylinder: the rotary unit is turned, if not already in the proper position, until stem 31 registers with hole 4| in the table; a screw driver is then applied to the kerf in head 38 and is pressed down until pin 44 reaches the lower end of the vertical arm of slot 43, driving the stem into hole 4|. The screw driver is then turned to carry the pin into the horizontal arm of the L slot. This looks the plunger down and, by continuing the movement of the screw driver, the pin reaches the closed end of the horizontal arm of the slot and thereafter turns the screw in the unscrewing direction. This final turning movement unlocks the slide without raising stem 31 out of hole 4|. Consequently the tool is now ready for insertion in a cylinder. If the expansible means requires to be contracted for entry into the cylinder, the bolt 8 is turned to draw the shoes 5 inward; the slide being carried along with the shoes because pin 33 is engaged with the star wheel. The tool having been lowered into the cylinder, bolt 3 is again turned, this time in the direction to spread the shoes and clamp the reamer to the cylinder; the cutting blade being simultaneously carried into proximity to the cylinder wall. All that then need be done before actual reaming is started, is to unlock disc 6 and again lock the slide to the latter. This is accomplished by turning the plunger device back to bring pin 44 into registration with the vertical arm of the L slot. This again tightens the screw and allows the stem to be lifted out of hole 4|. Cam device I1 is then turned to allow spring l6 to swing arm |4 out until the blade contacts the cylinder wall.

In order that the blade may be inserted or removed without disturbing block 22 in which it is mounted, one of the side walls of post l8 has in its edge a notch 45, best seen in Fig. 5, that registers with screw when the block 22 is at the upper limit of its movement. A screw driver may therefore be applied to screw 25 either to introduce or remove the same through notch 45; the blade being held in place only by the screw and being therefore removable and replaceable at will.

While I have illustrated and described with particularity only a single preferred form of my invention, I do not desire to be limited to the exact details thus illustrated and described, but

a rotatable member, expansible means connected with the table to secure the same in an engine cylinder, an element mounted on said rotatable member for adjustment radially of the axis of rotation; a cutter assembly on said element including a star wheel positioned above and near a radially movable part of said expansible means, and a depending lipoutwardly from and near said wheel; and a pin extending upwardly from said radially movable part for engagement with the outer side of the star wheel to turn it when said rotatable member revolves, and to engage with the inner side of said lip to shift said element when said expansible means expands.

2. A cylinder reamer as set forth in claim 1 having, in addition, a means to secure said rotatable member temporarily to the table against relative rotary movements.

3. A cylinder reamer as set forth in claim 1, in

\ eluding cooperating lock elements on the table and the rotary member for locking the latter together only when such parts register with each other, and the lock element on the rotary member being so positioned that it registers with the lock element on the table only when the star wheel and its actuating pin register with each other.

4. A cylinder as set forth in claim 1, wherein the table contains a hole, and wherein there is included a movable part adapted to be entered in said hole to lock the rotatable member against rotation relatively to the table, said movable part being so located that it registers with the hole only when the star wheel and the actuating pin therefor register with each other.

5. In a cylinder reamer, a table having thereon a rotatable member, expansible means connected with the table to secure the same in an engine cylinder, a slide mounted on the said member for movement at right angles to the axis of revolution,

, a screw and slot connection between the slide and the rotatable member to hold them against relative movements when the screw is tight, said table containing a hole that registers with said screw in a predetermined angular position of the rotary member, and a device on the screw and movable thereon into and out of the said hole when the latter registers with the screw.

In a cylinder reamer, a table having thereon a rotatable member, expansible means connected with the table to secure the same in an engine cylinder, a slide mounted on the said member for movements at right angles to the axis of revolution, a screw and slot connection between the slide and the rotatable member to hold them against relative movements when the screw is tight, said table containing a hole that registers with said screw in a predetermined angular position of the rotary member, said screw containing an axial bore extending throughout the length of the same, a screw-actuating plunger device positioned in said bore and shaped at its lower end for entry into the hole in the table, the upper part of the screw having in its annular wall an L-shaped slot, a pin on the plunger projecting into said slot, and a spring tending constantly to move the plunger device up until the pin reaches the upper end of the slot, the length of the vertical arm of the slot being such that when the plunger device is up it is clear of the table.

'7. A cylinder reamer as set forth in claim 6,

wherein the hand of the thread is such that when the plunger device is turned in the direction to carry the pin into the horizontal arm of the slot, should they be registering, the screw will be loosened.

enema! 8. A cylinder reamer as set forth in claim 6,

wherein the hand of the thread is such that when r the plunger device is turned in the direction to carry the pin into the horizontal arm of the slot, should they be registering, the screw will be loosened, and wherein the lower end of the plunger device and the table, when said device is up, is less than the distance which said pin must travel to move down into registration with the horizontal arm of the slot.

9. A cylinder reamer as set forth in claim 6, wherein the spring rests on the upper end of the screw and the plunger device is provided with a head that rests on the spring and by means of which the plunger device is rotated.

10. In a cylinder reamer, a table having thereon a rotatable member, expansible means connected with the table to secure the same in an engine cylinder, a slide mounted on said member for movements at right angles to the axis of revolution, a support for a blade on one end of said slide, means including a star wheel to move said support, a pin on said expansible means for engagement with said wheel when said member is revolved, a lip on said end of the slide located outwardly from the star wheel in positonlto be engaged by said pin to move the slide when the expansible means is expanded while the rotatable member is a predetermined angular position on the table, said table having a small hole therein, and a movable element mounted on the rotatable member so that it may be entered into said hole when said member is in said predetermined position. I

' HERBERT A. BERKMAN.

REFERENCES CITED The following references are of record in the fileofthis patent:

UNITED STATES PATENTS Berkman Nov.'.8 1938

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