US2280646A

US2280646A - Device for truing up shafts

Info

Publication number: US2280646A
Application number: US318472A
Authority: US
Inventors: Gosstrom Hugo
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-02-12
Filing date: 1940-02-12
Publication date: 1942-04-21
Anticipated expiration: 1959-04-21

Description

April 21 1942 H. GossTRoM 2,280,646

v DEVICE FOR TRUING UP sHAFTs Filed Feb. 12, 1940 Patented Apr. 21, 1942 Ni? STS DEVICE FOR TRUING UP SHAFTS Hugo Gosstrom, Dallas, rIlex.

Application February 12, 1940, Serial No. 318,472

4 Claims.

This invention relates to new and useful improvements in cutting tools.

One object of the invention is to provide an improved cutting tool for accurately turning or truing up shafts, the device being particularly adapted for use on crankshaits of internal combustion engines and being arranged so that removal of the shaft from the engine is not necessary in order to perform the cutting operation.

An important object ci the invention is to provide an improved cutting tool ior turning crankshafts to remove the unevenly worn surfaces of the crankshaft and to true up the crankshaft bearings, said tool having a plurality of guide elements and a cutting member disposed radially within a housing, together with improved means for adjusting the elements and member, whereby the tool may be readily adjusted for use on shafts of various diameters.

Another object of the invention is to provide an improved cutting tool, of the character described, wherein the cutter proper has its cutting point in direct radial alinement with the center of the shaft being turned, whereby chattering of the tool during the cutting operation is prevented and also whereby a more eilicient cutting action is produced.

A further object of the invention is to provide an improved cutting tool having its guide elements and cutting member mounted for radial adjustment with respect to the shaft being worked upon; said adjustment being accomplished by means of threaded adjusting screws, whereby a ne and accurate adjustment may be made and also whereby the elements and members may be zz locked in adjusted positions.

Still another object of the invention is to provice an improved tool, of the character described, which is constructed oi a minimum number of parts and which is simple and economical in manufacture.

A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.

The invention will be more readily understood.

al U

Figure 3 is an enlarged, transverse, vertical, sectional view, taken on the line 3 3 of Figure l,

Figure 4 is an enlarged sectional View oi the hinge for the split housing and taken on the line #l-fi of Figure 1,

Figure 5 is a transverse sectional View, taken on the line 5--5 of Figure 2,

Figure 6 is an isometric View of the cutter element, and

Figure 7 is an isometric view of one of the guide elements.

In the drawing, the letter A designates a split housing which is formed of two sections Ill and il. The section lo is of a greater semi-circular extent than the section il and said sections are hinged together by means of a link l2. The link is disposed within a recess i3 formed in the sections i@ and il and suitable hinge pins it fasten the links within said recess. Obviouslys the sections iil and il may be moved outwardly with relation to each other, whereby they may be readily engaged around a shaft. The outer ends of the sections il and ii are formed with flanges iii which are adapted to abut each other when the housing is closed, as shown in Figure 1. A suitable fastening bolt it and nut il serve to secure the abutting anges i5 together and thereby fasten the housing in its closed position around the shaft.

Each section of the housing A is constructed of a main body portion i8 and a plate i9 which is secured to one side of said body portion by means of rivets 2i), or other fastening means, as is clearly shown in Figure 3. The body portion is formed with a plurality of openings Zi which extend inwardly from the periphery of said body, said openings being arranged to receive a rod, or other element, whereby a manual rotation may be irrparted to the device. elements G are mounted in the sections Iii and H and are disposed radially therein. In addition to the guide elements G, a radially extending cutter element; C is also mounted in the housing. Since the section lil of the housing is larger in semi-circular extent than the section ll, four guide elements G and the cutting element C are mounted in this larger section, while the remaining guide elements, which are four in number, are mounted in the section li. The guide elements, as well as the cutter element C, are mounted in the same manner within the housing and it is believed that a description of one will sumcey For mounting each element radially within the A plurality of guide k housing A, the body I8 of each section is formed with a plurality of openings or bores 22 which extend inwardly from the inner periphery of the body, the number of said openings or bores corresponding to the number of elements to be mounted in the housing. Each bore is angular, being shown as substantially square, in crosssection and one side of said bore is formed by the inner face of the plate I9 which is secured to the body portion I8 of each section, as is clearly shown in Figure 2. The `extreme outer end of each bore 22 is provided with an annular recess or groove 23 and that portion of the bore beyond the recess or groove is circular, as indicated at 24.

Each guide element G includes a head 24a, which is substantially semi-circular in crosssection, whereby the head presents a rounded surface to the shaft (not shown) which extends through the device. The head 24a is provided with an elongate shank 25 which is preferably made integral with, and which is angular, being shown substantially square in cross-section. The square shank 25 is adapted to have a sliding fit within the square bore 22 (Figure 2), whereby the guide head 24 may be moved inwardly and outwardly in a radial path, with respect to the center of the shaft extending through the housing A. The shank 25 is formed with an axial bore 26 which is internally screw-threaded and which is arranged to receive a threaded pin 21 or screw. The threaded pin or adjusting screw 21 is preferably formed integral with a flanged collar 28, which collar is disposed within the circular portion of the bore 24 and annular groove or recess 23, as is clearly shown in Figure 2. The collar 28 is provided with a bolt head 29, which head is disposed beyond the outer periphery of the housing A.

Manifestly, with this arrangement, the ange of the collar 28 is confined within the groove 23 and said collar may undergo rotation,' but is not capable of an axial movement within the bore of the housing. The guide head 24a and shank 25 are held against movement within the bore 22 by means of said shank being square and in engagement within the square bore. Therefore, when the adjusting nut 29 is rotated, a rotation is imparted to the adjusting screw 21, with the result that the shank and head 24a are moved radially with respect to the center of the shaft which extends through the device A. By making the screw threads on the adjusting screw 21 and within the bore 26 of the shank relatively fine, it is possible to obtain a very fine adjustment of the guide head 24a. Also, the screw threads serve as a locking means for holding the head in various adjusted positions.

The cutter element C is mounted within one of the bores 22 in exactly the same manner as the guide element G, heretofore described. This cutter element includes a square shank 30 which is formed with an enlarged head 3| at its outer end. The shank has a threaded opening or bore 32 therein for receiving one of the adjusting screws 21 in the manner hereinbefore set forth. The enlarged head 3l at the outer end of the shank 30 is formed with a longitudinal groove or recess 33, which is adapted to receive the cutter blade 34. As is clearly shown in Figure 6, the cutter blade has its lower end inclined to provide a sharp point or cutting edge 35. Manifestly, since the cutting element is mounted in the same way as the guide elements, it is capable of a radial adjustment and movement relative to the center of the shaft which extends through the housing A.

It is pointed out that the various guide elements G are disposed within the housing A in such a manner that the center of each guide element is aligned with the center of the shaft around which the housing is engaged. Such alignment is effected by locating the bores 22 in a manner within the housing so that the center line of each bore intersects the center of the housing and the center of the shaft, as indicated by the lines L in Figure 1. However, the center line of the bore 22 within which the shank 30 of the cutter element C is mounted, is offset a few degrees, whereby its center line does not intersect the center of the shaft. The offsetting of this bore is such as to locate the vertical face of the cutter blade 34 in direct radial alignment with the center of the shaft, whereby the cutting point or edge 35 of said blade is aligned with said center. In this manner, it will be evident that upon rotation of the housing A, the cutting edge 35 is at all times aligned with the center of the shaft during the cutting operation. This is an important feature of the invention for it provides for a smoother and more even cutting and also eliminates chatter during the cutting operation. It is noted that the bore 22 within which the cutter element is mounted could be aligned with the center of the housing and shaft, and the cutter blade offset relative to the head 3| and shank 36 to dispose the cutting edge in radial alignment with the center of the housing and shaft.

From the above, it will be obvious that a simple and efficient cutting tool is provided. The guide elements G are adjusted so as to contact the outer surface of the shaft which is being worked upon and said elements serve to center and hold the shaft in position. The cutter element C, being disposed as above explained, cuts or turns the outer surface of said shaft to true up said shaft. The device is hand operated and may be applied to the shaft without removing the same from the particular engine or machine with which it is associated. Obviously, the unevenly worn surfaces of the shaft or those portions of said shaft which have been scored may be made smooth. The particular arrangement, whereby the various elements may be adjusted provides a very simple and effective way for effecting such adjustments. Each guide element, as well as the cutting element, may be individually adjusted to a very fine point and due to the threaded adjusting screws, each element is locked in its adjusted position.

The foregoing description of the invention is explanatory thereof and various changes in the size, shape and materials, as well as in the details of the illustrated construction, may be made, within the scope of the appended claims, without departing from the spirit of the invention.

What I claim and desire to secure by Letters Patent is:

1. A cutting tool including, a housing formed of arcuate sections hinged together and having a central opening when the sections are swung together, the housing having a plurality of radially disposed bores which have their centers aligned with the center of the housing, a guide member mounted in each bore and having its inner end extending inwardly beyond the inner periphery of the housing, said housing also having a bore which is offset from the center of the housing, a cutter element mounted in said lastnamed bore, the oiset of said bore locating the cutting edge of the cutter in radial alignment with the center of the housing, means for moving the guide members and cutting element with their respective bores to adjust the same radially, and means for locking the members and elements in their various adjusted positions.

2. A cutting tool including, a housing formed of arcuate sections hinged together and having a central opening when the sections are swung together, the housing having a plurality of radially disposed bores, each bore having its major portion angular in cross-section with its remaining portion cylindrical, said bore also having an annular groove in its wall disposed between the angular and cylindrical portions, a cutter element mounted in one of the bores and guide elements mounted in each of the remaining bores, each guide and the cutter element having an an ular shank slidable in its respective bore, an adjusting screw extending axially through each bore and having threaded engagement with the shank of the element therein, and a flanged collar on the adjusting screw co-acting with the annular groove and the cylindrical portion oi the bore to permit a rotation of the screw while preventing an axial movement thereof, whereby each screw may be rotated to impart movement to its respective element.

3. A cutting tool including, a housing formed o arcuate sections hinged together and having a central opening when the sections are swung together, the housing having a plurality of radially disposed bores, each bore having its major portion angular in cross-section with its remaining portion cylindrical, said bore also having an annular groove in its wall disposed between the angular and cylindrical portions, a cutter element mounted in one oi` the bores and guide elements mounted in each of the remaining bores, each guide and the cutter element having an angular shank slidable in its respective bore, an adjusting screw extending axially through each il?. d)

bore and having threaded engagement with the shank of the element therein, and a flanged collar on the adjusting screw co-acting with the annular groove and the cylindrical portion of the bore to permit a rotation of the screw while preventing an axial movement thereof, whereby each screw may be rotated to impart movement to its respective element, the bores within which the guide elements are mounted having their centers aligned radially with the center of the housing and the bore within which the cutter element is mounted having its center offset from radial alignment with the center of the housing, whereby the cutting edge of said cutting element is aligned with the center of the housing.

4. A cutting tool including, a housing formed of arcuate sections hinged together and having a central opening when the sections are swung together, the housing having a plurality of radially disposed bores, each 'bore having its major portion angular in cross-section with its remaining portion cylindrical, a cutter element, having an elongate cutting blade which extends transversely thereacross mounted in one of the bores and guide elements mounted in each of the remaining bores, each guide and the cutter element having an angular shank slidable in its respective bore, and rotatable means within the cylindrical portion of each bore conned against longitudinal movement therein and engaging the shank of the element for imparting movement to the bore, whereby radial adjustment of the elements may be effected, the bores within which the guide elements are mounted having their centers aligned radially with the center of the housing and the bore within which the cutter element is mounted having its center offset from radial alignment with the center of the housing, whereby the cutting edge of said cutting element is aligned with the center of the housing.

HUGO GOSSTROM.