US1630353A - Internal-cylinder grinder - Google Patents

Description

May 31, 1927. v1,630,353

l.. D. PANGBORN ET AL 'l INTERNAL CYLINDER GRINDER Filed July l2, 1924 ay ai, 1927- Patented LEO D; PANGBORN, ROGERS M. WARWICK, AND GEORGE H. MGKAY, or CHICAGO, ILLI- NoIs, AssIGNoRs, BY MESNE ASSIGNMENTS, 4To CHICAGO HARDWARE FOUNDRY COMPANY, OF CHICAGO, ILLINOIS', A CORPORATION oF ILLINOIS.l

INTERNAL-CYLINDE GRINDER.

Application tiled July 12, 1924.` Serial No. 725,573.

This invention relates generally to internal grinding devices and in particular to a portable device for grinding the cylinders of internal combustion engines.

Other devices in this art have long been employed, but the structures thereof have been inadequate for exact grinding work because o f certain deficiencies. Many prior devices have a plurality of movable arcuate l0 abrasive members which are rotated or reciprocated within a cylinder to be ground. Some of these are adjustable to vary the diameter, but no means is provided for maintaining these members at all diameters axially parallel. It has commonly been the practice to use the cylinder walls `being ground as the guiding means for these mem.

bers. lThis practice obviously maintains or exaggerates Certain original defects in the work. Other types of devices, however, have been provided which have a cylindrical grinding element, and hence this type overcomes the deficiencies above set forth for the other types, but the cylinder elements heretofore provided are not equipped with adjusting means to varyv the diameter of the grinder. f

It is an object of the invention to provide a cylinder grinder having at all times abrasive surfaces which are axially parallelv to the axis of the grinder irrespective of the walls of the cylinder being ground.

It is another Object to provide a grinder having a cylindrical abrasive surface which vantages of the invention will become ap.

parent from the following description of an exemplaryy embodiment of the invention which is shown in the accompanying Idrawings. The device of the drawings is a mechanism by which axially parallel grinding surfaces' are maintained, and in which 'is capable of size variation for adjustment.

the abrasive element is a single continuous abrasive surface, but it is to be understood that various other embodiments are contemplated by the invention as will more fully appearhereinafter.

In the drawings, Figure 1 represents a longitudinal section ofthe device as viewed along the line 1-1 of Fig. 2.

Fig. 2 shows a cross 'sectional View along the line2-2 of Fig. 1.

Fig. 3 is across sectional line 3 3 of Fig. 1.

The device illustrated comprises a main shaft 10.Which carries the grinding device. A suitable universal joint 11 is provided on the shaft through which a reciprocating and rotary motion` is transmitted to the device as a whole. A plurality of longitudinal members Orbars 12 is mounted on the shaft for parallel motion radially toward and away from the shaft in'order to effect a change in the diameter of thedevice. It is the generall object of the invention to provide these longitudinal members with an abrasive carrying means substantially rigid therewith, to provide means for adjustlng the diameter of the device, and to provide suitable resilient means co-operating with the adjusting means.

As a means for maintaining the longituviewalong the dinal members 12 radially movable in parallel relationship to the axis of the grinder, a parallelogram linkage is provided for each member 12. In the present instance four such members are provided. Collars 13 and 14 are provided at spaced points on the shaft 10 and'are rigidly secured thereto by suitable means as the in 15 for collar 13 which maintains it fixe ly on the shaft, and as nuts 16 and 17 threaded onto shaft 10 for i maintaining collar 14.- adjustably fixed.

Suitable projections or lugs 18 are provided radially of the collars as pivot joints for the parallelogram linkage. The projections herein shown are formed by cutting four rectangular V-notches 19 into an enlarged portion 20 of the collars 14 and 15, thereby providing the projections 18 with parallel side faces through which pass the pivotal pins 21 herein shown as screws. The two faces of each of the projections' 18 are flanked by `short parallel links 22and 23 which extend to the longitudinal members 12, the upper and lower sets of links being mutually parallel. Pivotal pins 24 are shown connecting each member 12 with each pair of links 22 and 23. By this construction eachmember 12 becomes radially movable with respect to the shaft 10, is at all times parallel thereto and is rigidly mounted against lateral deviation from the fixed radial line.

A suitable expansion mechanism is next provided. Internal lugs or projections 26 are formed on each member 12, there being beveled surfaces 27 on each lug. A bored tapering element in the shape of a conical frustum 28 is axially movable on the shaft 1() as a cam, acting on the beveled surfaces 27 of the lugs 26. The shaft 1() is screwthreaded at 29 and is provided with a nut 30 which movesthe cone to move the members 12 radially. A lock nut 31 is also provided on the shaft. / Tbe nuts 30 and 31 are of specially `large diameter and are knurled for easy manual manipulation. The lock nut 31- is provided with very loose fitting threads which will permit the nut to rock slightly when positioned on the threads of the shaft 10. A thumb screw32 near the periphery of the nut 31 locks the two nuts more firmly together vthan the merev manual locking effect which may be obtained by tightening nut 31 onto nut 30.

Suitable spring means is then provided tending to contract the members radially against the cam action ofthe movable cone. By providing each of the members 12 with a suitable arcuate abrasive surface the grinder-is completed. In the present instance the arcuate abrasive surface andthe spring acting means are-contained in a single member by the provision of a resilient and radially expansible cylinder.v A steel cylinder 33withaI substantially longitudinal slot 34 therein is placed about the members 12. Radial expansion of the members 12 is resisted by the resiliency of the cylinder. One of the members 12 is provided with pins 35 .which fit into corresponding holes 36 in' the cylinder 33 to maintain it rigidly fixed longitudinal of the device. A screw 37 Vthrough the cylinder into the bar holds the cylinder thereon against accidental springmg away from the bar. A number of pairs of holes 36 may be provided to effect a variation of the position of the cylinder on the members 12 in which case the corresponding screw holes 38 in the bar are provided VVfor the screw 37.

An abrasive cloth 39'is used about the cylinder.' For suitably securing the cloth thereto a strip 40 is held inside the cylinder by screws 41 entered into the outside face thereof. The edge 42 of the cloth 39 is clamped between the cylinder and the strip and the cloth then wrapped about the cylinder. The other edge 43 may be left free either within .a very slight adjustment.

or without the cylinder according to its length, there being no necessity to clamp or tighten it if the device is rotating in the direction of the arrow in F ig. 2.

The device is specially designed for being mounted upon and vopera-ted by a portable motor, as for example, one used for handelectric drills. A quickly detachable coupling is therefore provided. Above the univeisal joint 11 is a driving shaft 44 which is operated by the electric drill or other power means. The universal joint 11 has vits upper member 45 provided with screw threaded head 4G having projections 47 thereon diametrically disposed adjacent the periphery. The shaft 44 has a. disk 48 at its end with a dianietrically disposed groove inder which is expanded to fit into the automobile cylinder to be ground. The device as a whole is then inserted into the cylinder and further expanded until it grips the same sufficiently to support itself. This adjustment is effected by screwing nut 30 to move .the cone 28 toward the bottom of the device in such manner that the radial expansion of the parallel bars takes place. The nut 31 -is then screwed to lock nut 30 into position and the screw 32 is used to bind the nuts 30 and 31 more effectively in'locked position. This arrangement serves in coopera-l tion with the cone 28 to lock the grinding mechanism in adjusted position, the resiliency of the cylinder exerting` pressure 1nwardly on the bars 12 against the cone 28. After this adjustmentlhas been made the electric drill or other power meansis connected and so operated as to rotate the whole device within the cylinder the same being reciprocated axially thereof manually or mechanically as may be required. When-required the device may be further expanded to increase the diameter slightly, and thus a feeding action may be secured `without removing the device from nits operative position.

After longusafre the device may require It will be 0bserved that the upper ends of the bars 12 are held against contraction by the cone 28, thus relieving the upper set of links of considerable wear. No such means is provided at the bottom set of links which therefore take all of the force of the lower ends, resulting in unequal wear between the upper and lower links. This tends to shorten the 'effective length of the lower links and may destroy the parallel relationship. However, by the provision of the adjustably xed collar l5 this may be compensated for by a very slight adjustment which is insufficient to destroy the desirable relationship of the linkage and the structure as above set forth.

The use of an expansible cylinder and the parallelogram linkages above described provides a grinding device having at all times a-,substantially cylindrical abrasive surface. It will be observed that in the expansion of the cylinder, the four radial bars 12 serve to bulge four portions of the cylinder by pressing equally upon substantially the entire length of the spaced portions'of the cylinder. j

It is the ultimate object of the invention to produce a device of such a character that it may be inserted `into a cylinder and rotated, defining in its rotation a truly cylindrical path independently of any .guiding action by the walls of the cylinder being ground. It is evident that the device herein described accomplishes this purpose by a simple construction dependent, in the present instance, upon the employment of the simple parallelogram linkage -toeif'ect the proper movements of the bars toward and from the common' center, maintaining the parallel relationship of the bars andthe axis of the device.A

To those skilled in the art it is apparent that other embodiments of the ideas herein set forth are equally within the contemplation of Ithis invention; In the appended claims it is our aim to setforth and define the invention in its broadest scope limited only by the prior art.

We claim-as our invention:

l. An internal grinding device comprising, in combination, a central shaft, two

spaced collars on said shaft, one collar being adjustable and the other being fixed, a pluralityof parallel bars extending longitudinally of said rshaft and being radially movable relatively thereto, a plurality of links pivotally connecting said bars to said collars. a' cone adjustablymounted on said shaft and engaging said bars for adjusting said bars radially,and abrasive carrying means de- .ining a cylindrical surface mounted on said bars. n

2. An internal grinding device comprising, in combination, a main shaft, a plurality of members mounted in parallel relationship to said shaft for radial motion with respect thereto. a resilient cylinder having a longitudinal slit therein, saidl cylinder encircling said members and being substantially coextensive in length therewith, co-operating means between one of said members and said cylinder to effect a rigid relation therebetween, and means to expand said members radially to expand the cylinder against the resiliency thereof, said cylinder being adapted to receive an abrasive material.

3. An internal grinding device comprising, in combination, a main shaft, a plural l combination, a cylindrical .abrasive-carrying member, said member being a resiliently and radially expansible. cylindrical device, and an expansion device carried within said cylindrical device, said expansion device comprising a plurality of parallel circularly disposed members extending substantially the length of the cylindrical device, and an expansion mechanism for said members, said cylindrical device being associated with said expansion device, and anoperating means carrying the expansion device -and cylindrical device.

5. An internal grinder, having 1n combination, a cylindrically shaped abrasive carrying member, said member being radially eX- pansive, a plurality of parallel members within said cylinder extending substantially the length thereof, means Auniformly to adjust said members radially of the cylinder, means to hold the cylinder rigidly with said members, and an operating shaft located, centrally of the cylinder for carrying said members.

6. An internal grinding device comprising, incombinatioma central shaft, two

spaced collars on said shaft, a plurality of radially movable members parallel to said shaft, pivotal parallel links from each of said members to said collars, means to adjust said members radially, uniformly. and simultaneously with respect to said shaft, and anpexpansible cylinder surrounding said members and being adapted to carry an abrasive material. y

7. An internal grinding device compris; ing, in combination, a central shaft, two spaced collars on said shaft. lugs on said collars, each lug having parallel side faces, lugs on one collar being alined with the lugs on the other :collar parallel with the shaft, a plurality of members radially movable with respect to the shaft, four parallel pivotal links from each member to one set of alined lugs, said links flanking the parallel faces of said lugs. an abrasive-carryiner expansive cylinder surrounding saidl members, and means simultaneously te adjust radially of the cylinder and nation, a shaft, a plurality of bars adapt-edv to be moved toward and away from said shaft. parallel links connecting each of said bars to said shaft, means for moving said bars away from said shaft and for locking said bars in adjusted position, and an expansible sleeve secured to one of said bars and adapted to be enlarged and loekedin adjusted position by said bars.

9. A cylinder grinder comprising. in combination. a shaft. a plurality of bars. parallel links connecting said bars to said shaft, a .cone movable longitudinally upon said shaft and adapted to Contact With said bars to more said bars awav from said shaft, a-

lock nut threaded on said shaft and adapted to abut said. Cone, a second lock nut having a threaded bore slightly larger than the threaded diameter of said shaft, and a movable screw carried by said second named lock nut and adapted to bear against said.

10. A cylinder grinder comprising. in comv bin-ation, a resilient substantially cylindrical abrasive device. a plurality of circumferentially disposed parallel members arranged concentrically within said cylinder, and means to move said members radially with respect to the common center, said members serving thereby to maintain corresponding portions of the abrasive device in circumferential relation to said center.

In testimony whereof We have hereunto affixed our signatures.

LEO D. PANGBORN. ROGER-S M. iVARivICK. GEORGE H. MCKAY.

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