US1474649A - Cylinder-finishing tool - Google Patents

Description

Nov. 20, 1923. 1 ,4 1,474,649 Y 4 A. STORM CYLINDER FINISHING TOOL Filed 0C4; 30 H 1922 Patented Nov. 20 1923.

UNITED STATES ALOLPH STORM, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO STORM MANUFACTUR ING COMPANY, OF MINNEAPOLIS, MINNESOTA, A COPARTNERSHIP GONSISTING OF SAID STORM AND O. W. NELSON.

CYLINDER-FINISHING TOOL.

Application filed October 30, 1922. Serial No. 597,866.

To all whom it may concern:

Be it knownv that I, ADOLPH STORM, a citizen of the United States, residing at Minneapolis. in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Cylinder-Finishin Tools; and I do hereby declare the fol owing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art-to which it appertains to make and use the same.

My invention provides an improved and highly. efficient cylinder-finishing tool, and, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

This improved tool. herein designated as a cylinder-finishing tool, is adapted to be used to polish and finish'the cylindrical surfaces of new or rebored engine cylinders. In fact, the tool is adapted for use to true up old cylinders without: requiring reboring where but little metal needs to be removed.

The preferred form of the tool is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings: Fig. 1 is a side elevation of the improved tool;

Fig. 2 shows the tool'chiefiy in section on the line 22 of Fig. 1, but with some parts in full and with the tool applied in a cylinder; and

Fig. 3 is a horizontal section taken on the line 3 3 of Fig. 2.

The cylinder casting is indicated by the numeral 4. The finishin tool is adapted to be carried and rotate .by any suitable means,'but, as shown, is carried at the lower end of an upright rotary spindle 5. Said tool comprises a head 6 into whicha trunnion on the lower end of the spindle 5 is shown as axially screwed. Said head 6 has a large axial cylindrical cavity 7 and, below said cavity, has a diametrical slot 8. At its extreme lower end, extending transversely and centrally of the slot 8, the head 6 is provided with a. transverse bridge 9. Pivoted n the bolts 10 applied to opposite sides of the head (3 are downwardly diits threaded lower portion.

verging gripper-carrying levers .11. Each lever 11, as shown and preferably designed. comprlses a pair of rigidly connected metal straps. the lower portions of which are spread to form forks 12. These forks 12 embrace the sides of hone or grinding stone grippers 13 and,'at their lower ends, are pivotally connected to the central portions thereof by nut-equipped bolts 14. These grippers 13 are preferably channel-shaped stamped metal structures, the sides of which are adapted to be sprung together by clamping bolts 15 and thereby firmly clamped to the hones or grinding stones 16. As shown, the grippers 13 are provided with outstanding centrally located. ears 17 that are connected by a light coiled spring 18, the function of which will presently appear.

Working with threaded engagement through the bridge 9 and extending axially of the head 6 into the cavity 7 thereof is an an 101 bolt 19, to the upper end of which a flange 20, as shown in the form of a washer, is rigidly secured by a clamping nut 21. A disk-like follower 22 is slidahly mounted on the smooth portion of the bolt 19 and engages the short lug-like upper end projections 23 of the levers 11. v

A coiled spring 24 loosely surrounds the bolt 19 and and is compressed between the relatively fixed flange 20 and slidable or loose follower 22. This spring 24 is of such strength that it readily overcomes the relatively light tension of the spring 18 and normally holds the levers 11 spread as ar as permitted by the engagement of the follower 22 with a shoulder 25 formed on the bolt 19 at the upper extremity of The extreme lower threaded end of the bolt 19 is preferably formed with a transverse slot 26 adapting it to be readily turned by a screw driver;

Operation.

Normally or when the tool is outside of the cylinder, the main tension 5 ring 24 will hold the follower 22 against t e shoulden 25, thereby determining the normal spread of the outer grindingfaces of the two hones 16, but it is obvious that the farther the bolt 19 is screwed down through the bridge 9, the wider will be the spread of the tw hones under the normal condition above just noted. In adjusting the tool for any particular cylinder, the bolt 19 should be set so that the follower 22 will be slightly above the shoulder 25 when the hones are active against the inner surface of the cylinder. The spring 18 simply takes up slack and keeps the lugs 28 of the levers 11 lightly premed against the follower 22, when not in use, but the tension of said spring 18 does not, in any case, interfere with the action of the spring 24, the function of which latter is to keep the hones pressed outward into engagement with the cylinder under the propergri'nding tension.

lVith the bolt 19 set in a certain position, it is evident that the spring 24 will have increasing tension as the hones are moved closer together-and, hence, that in the absence of a provision for adjustment, the bones would be forced against cylinders of ditferent sizes, under different pressures. This is entirely avoided with the arrangement described, for with the hones setinto any. particular cylinder, the bolt 19 may 77 be t d axially so as to give exactly the desired pressure. It, of course, also follows that the spring 24 may be set under any desired tension for any particular diameter of cylinder but may be constant in pressure for cylinders of different diameters This improved tool, by virtue of the construction already described, has another and very highly important action which will now be fully considered.

It is evident that if one ofthe levers 11 be moved toward the axis of rotation while the other lover remains in a more divergent position, the said first moved lever will be subject to the entire tension from the spring 24. From this, it follows that the two levers will be subject to the same tension from the spring 24 when and only when the axis of the shaft 5 and head 6 is coincident with the axis of the cylinder into which the hones have been inserted. It, for instance, the said axis is closer to the right-hand than to the left-hand side of the cylinder. then the spring 24 will exert a lateral thrust through the right-hand lever 11, which will tend to move either the cylinder toward the right or the shaft 5 and head 6 toward the left, until the axis of the tool is coincident with the axis of the cylinder, and when the cylinder is free to shift in respect to the head 6 or the said head 6 is free to shift in respect to the cylinder, the accurate alignment of the tool with the cylinder will be automatically accomplished by the rotation of the tool within the cylinder.

The above self-centering action is highly important and, of course, would not be present with a spring, for example, having its basis of reaction directly against or between the two levers.

In actual practice, the efficiency of this tool has been thoroughly den'ionstratcd. The hones or grinding stones may be of any material which will put an extremely smooth finish on 'the interior of the cylinder. In some cases, they inight even be coarse. for rapidly removing the interior surface of the cylinder, but usually they will be of fine grain for producing a fine finish.

The term hone is herein used in a broad and liberal sense to include ,any kind of abrasive finishing or cutting block or the like. In the most approved arrangement of the tool, the head will be rotated while the cylinder being finished will be held against rotation, frictionally' or otherwise, but it would be within the scope of the invention as herein claimed to hold the finishing toolagainst rotation and to rotate the cylinder.

What I claim is:

1. A tool of the kind described comprising a rotary head, levers pivoted to said head, finishing hones pivotallycarried by the extended ends of'said levers, a spring tension device carried by said head and independently reacting against said levers and exert ing a force thereon tending to spread said levers and finishing hones, said spring tension device being adjustable as an entirety, so as to vary the spread of said levers without changing the tension of said spring tension device.

2. The structure defined. in claim 1 in further combination with means for adjusting the tension of said spring tension device independently of its ad ustments as an entirety.

3. A tool of the kind described comprising a rotary head, levers pivoted thereto, finishing hones pivotally carried by the extended ends of said levers, a spring tension device reacting against said head and independently reacting against said levers and exerting a force thereon tending to spread said levers and finishing hones, the said spring tension device having a stop normally limiting the action on said levers, and means for adjust ing said stop and the base of reaction of said spring tension device in respect to said levers.

4. A device of the kind described comprising a rotary head, a plurality of levers pivoted to said head at their upper ends for swinging movements in planes radiating from the axis of said head. said levei s at their pivoted upper ends having inwardly ofi'set bearing lugs, a spring-pressed follower seated lIl said head and independently operating on the bearing lugs of said levers and exerting force tending to move said levers radially outward, and finishing tools pivoted to the free ends of said levers.

5. A device of the kind described comlilo prising a rotary head having an axial cavity and below said cavity having diametrically and subject to said spring and having a limited downward movement on said bolt, a pair of levers pivoted to said headwithin the diametrically opposite slots thereof and having upper ends independently engageable with said spring-pressed follower, grippers intermediately pivoted to the lower ends of, said levers, and bones held by said grippers.

6. The structure defined in claim 5 in combination with a retracting spring connecting said grippers and exerting a .force thereon in opposition to but materially less than the said tension spring.

In testimonywhereofl aflix my si nature.

ADOLPH s 'r RM.

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