US1755965A - Lapping and grinding device - Google Patents

Description

April 22, 1930. .1. w. oMEY LAPPING AND GRINDING DEVICE Filed Nov. 2, 1927 wus yz5 f ParenteaeApr. la?, 1930 UNITED STATES PATENT ol-'FlcE JOHN W. OMEY, OF DETROIT, MICHIGAN, ASSIGNOR TO PACKARD MOTOR CAR COM- PANY, oF DETROIT, MICHIGAN,

A CORPORATION F MICHIGAN LAPPING AND @BINDING DEVICE Application led November 2, 1927. Serial N'o. 230,431.

This invention relates to lapping and grinding devices and more particularly to grinding devices for finishing cylindrical apertures.

It has been the practice heretofore to provide a plurality of radially adjustable abrading members for lapping or grinding cylinders. The abrading ymembers usually comprise grinding stones lor bars of lapping metal used with an abrading compound and are member and a readily generally mounted on supports whichv in the past have not proven entirely satisfactory because the abrading members have not been supported with suilicient rigidity to prevent warping, bending and other injury thereto, and the supports are also found lacking in adequate means for mounting and demounting the abrading members.

In some instances the abrading members are mounted on supports in lead or other soft metal cast as binders to secure the abrading members in position. In such cases the matter of replacement and repair causes considerable annoyance and unnecessary delay, since in dismounting the abrading members it becomes necessary to melt the metallic binders in which they are set, andin mounting to position the abrading members in the supports and cast the binders. By this method the supports become warped and distorted due to the constant heating thereof and are thus rendered worthless. The present invention aims to overcome these objectionable features by providing a suit-able support demountable abrading member.

An object of the invention is to provide suitable support means for abrading members for lapping or grinding cylinders.v

Another object of the invention is -.to provide a lapping or grinding device for. grinding or finishing cylinders having readily demountable abrading members.

Yet another object of the invention is to provide a lapping or grinding device for grinding or finishing cylinders having a plurality of radially adjustable supports each .carrying an abrading member which may be easily and quickly removed or replaced.

A further object of the invention is to provide a lapping or grinding device for grinding cylinders comprising support members each carrying a demountable interlocking abrading member which may be easily and quickly removed or replaced.

Another object of the invention is to proyide a lapping or ygrinding device for grind- Ing or finishing cylinders and to constructsuch device so that the grinding or abrading members are supported parallel to the axis of the working head and are radially adjustable with respect thereto.

A still further object of the invention is to provide a lapping or grinding device for grinding or finishing cylinders, which is highly eilicient in operation and yet of marked simplicity as a whole and in respect to each of itsy component oparts so that its manufacture is economically facilitated both as to parts and their assembly.

Other objects of the invention will appear from the following description taken in connection with accompanying drawings, which form a part of this specification, and in which:

Figure 1 is a side elevation illustrating the abrading members in position;

Figure 2 is a vertical sectional View;

Figure '3 is a top plan view; and

Figure 4 is an enlarged detail View of one of the abrading members.

Referring by numerals to the drawings, l0 represents a working head comprising a cylindrical body having a plurality of radial bosses 11 arran ed in pairs and bored normal to the axis of t e head as indicated at 12, to receive arms 13 spotwelded or otherwise secured or formed upon support members 14.

The arms 13 are normal to the support memmembers do not fit in the channels perfectly,

' gibs or shims are employed and backed by the screws 20. The abrading members are further secured in position by screws 20 mounted transversely in the flanges 16 adjacent to the respective endsof the lapping or abrading members. These screws serve to clamp the flanges 16 upon the bevelled edges of the lapping or abrading members, the back portions of the support members yielding suiciently for this purpose. As shown, the screws 20 have mounted thereupon sleeves 21, which engage the respective ends of the abrading members to prevent lateral movelnent thereof, the sleeves being provided'with lugs 22 fitting in notches 23 in the ends of the support members and bent or curved to form hooks 24 for the receptionof a spring 25 adapted to retain the radial arms 11 in engagement with adjusting members mounted in the working head, to be hereinafter described.

'lhe working head 10 is provided with a central bore 26 mounted in each end of which is a cylindrical member 27 having a conical portion 28. These members are positioned in reverse with respect to each other, with their conical portions opposite the radial bores 12 to provide abutments for the arms 13. As shown, the members 27 are centrally bored as indicated at 29 and one of these members is internally threaded as at 30. A shaft 31 is mounted into the threaded portion 30 in one of the members 27 and extends through the bore in the other member 27 and is provided with a head 32 fitting in a recess 33, a coil spring 34 being mounted upon the shaft 31 between the members 27 to retain them in spaced relation.

The head 32 on the shaft 31 has pivotally connected thereto an extension shaft 35 which passes through an elongated sleeve or tubular member 36 pivotally connected to the upper end of the working head 10 by a collar 37. The tubular member 36 is provided with a cap 38 through which the shaft 35 extends to provide adjustment of the members 27. As shown, the cap 38 is provided with trunnions 39 or other means may be employed for connecting the working head to suitable motor power for imparting reciprocating and rotating motion thereto.

By rotating the shaft 35 and accordingly the shaft 31 swivelled thereto, the members 27 will be moved away from or toward each other and in so adjusting these members the radial arms 13 on the support members 111 carrying the abrading members are moved radially inwardly or outwardly according to the direction in which the shaft 31 is rotated. Itis, therefore, apparent that since the abrading members may be adjusted radially, the device is adaptable for., grinding cylinders of various sizes within the limits of the capacity of the device. The device is adjustable for cylinders having the same diameter from end to end, or cylinders having a tapering or conical wall and that by reason of the particular structure of the supports for the lapping or abrading members, the matter of re placement and repa'irs ofthe lapping or abrading members may be readily and quickly accomplished, since by removing the transverse screws positioned at the respective ends ofthe supports the lapping or abrading members can be easily removed and replaced.

Although this invention has b'een described in connection with certain specific embodiments, the principles involved are susceptible v of numerous other applications that will readily occur to persons skilled in the art. j

The invention is therefore limited only as in v dicated by the scope of the appended claim.y

Having described the various features of the invention, what I' claim and desire to secure by Letters Patent, is

A grinding device comprising a working head having 'central and radial bores, a sleeve connected to said working head, an adjustment mechanism in the' central bore of the working head, an extension shaft connected `to the adjustment mechanism, said shaft eX- tending through and beyond the sleeve and provided with means for operating the ad-v

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