US2511443A - Sine bar attachment - Google Patents

Description

June 13, 1950 MCDOWELL 2,511,443

SINE BAR ATTACHMENT Filed April 11, 1946 Patented June 13, 1950 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to precision instruments, and more particularly to an instrument for setting tapers to a high degree of accuracy on various machines.

The object of the invention is to provide an instrument of the type indicated of rigid construction but capable of easy assembly and adjustment with parts capable of use for various purposes when disassembled.

The invention consists in the novel construction, arrangement and combinations of parts hereinafter more particularly described and claimed.

One sheet of drawings accompanies this specification as part thereof in which like reference characters indicate like parts throughout.

In the drawing:

Fig. 1 is a side elevation of the improved instrument.

Fig. 2 is a plan view.

Fig. 3 is an end elevation.

The present instrument belongs to that general type in which straight edges are assembled with standard sine blocks by means of which the angularity of the straight edges is accurately determined.

In accordance with the present invention, a mandrel part I is provided herein illustrated as cylindrical in shape having axially disposed center bores 2-2 at either end and one planar true face 3 extending in the illustrated embodiment from one end through the major length of the mandrel. Adjacent the other end a transverse arcuate bearing 6 is formed, the axis of the arc of said bearing extending parallel with the surface of the true face 3 and perpendicular with respect to the long axis of the mandrel I. The mandrel may, of course, :be square, octagon, or any desired cross-section.

A sine bar 8 is provided having a planar true face and also formed at each end with cut away seats for roller members 'l1'. The seats for these rollers, it will be noted, are formed at one end by the perpendicularly disposed faces 9 and at the other end by the perpendicularly disposed faces Hl and the rollers '|1' which are of cylindrical form are secured in fixed relationship to the sine bar 8 as by screws 9.

The sine bar 8 is further provided with a medial transverse bore adapted to rotatively seat the reduced end portions l9|9 of two stud members iii-4B which reduced portions l9l9 are formed respectively with complementary threaded stud and socket 20 by means of which the stud members 18-18 are secured together and rotatively mounted with respect to the sine bar 8. Each of the stud members it is provided with a transverse bore through which is rotatively mounted an adjustment screw I! which screws I! are held in rotative relationship with the studs [8 by an annular groove formed on the member I! and a transverse pin 26 extending through the stud l8.

A sleeve member 4 having an orifice conforming in shape with the mandrel l is slidably mounted on said mandrel and provided with a set screw H by means of which said sleeve can be held in adjusted position on the mandrel. Diametrically disposed orifices are provided one on either side of the sleeve 4 in which orifices I5 are rotatively mounted studs l2|2 which studs are held in position by means of an annular groove and cross pin 16. The outer ends of the studs l2 are provided with knobs l3 having threaded orifices complementary to the threaded stems M of the screws 11.

The sine block is further provided intermediate its ends with a transverse bore adapted to receive a stud 2! upon the outer end of which is positioned a transverse frame 22 carrying a level 23.

In assembling the instrument the sine bar 8 having rigidly associated therewith the transverse cylindrical bearing members 1-1, is placed on the mandrel with the bearing roller I seated in the transverse bearing seat 6. The screws M are then threaded through the studs l3 and the sleeve 4 adjusted lengthwise of the mandrel l, to provide the most convenient bearing for the sine bar in connection with the particular angle to which the instrument is being adjusted. Thereafter, sine blocks S indicated for that particular angle, are placed on the true face 3 of the mandrel directly under the roller bearing 1 and the screws I1 tightened down to rigidly associate the sine bar 8 with the mandrel I. In this position the true faces 3 and 5 will conform with the angle of the sine blocks S. The instrument can then be placed in a lathe or other machine tool with the centers of the machine engaging the center bearings 2-2 of the mandrel.

When disassembled, the sine bar 8 is available for use in various ways in setting up work on a bench.

Having thus fully described my invention, I claim:

Taper setting instrument comprising a mandrel having axially aligned centering holes in its ends and a true planar face extending parallel with its axis, said mandrel further formed with 3 a transversely disposed roller bearing adjacent one end, a sine bar formed with a longitudinally extending true face, with oppositely disposed roller seats adjacent each end, roller elements fixedly seated one in each roller seat on the sine bar and means longitudinally adjustable on the mandrel for securing the sine bar in angularly adjusted relation to the axis of the mandrel with one roller seated in the roller bearing of the mandrel and the other roller contacting a standard sine block seated on the true face of the mandrel, said means comprisin a carriage embracing and slidable longitudinally on the mandrel, means for securing the carriage in adjusted position on the mandrel, studs swiveled on the carriage to turn on an axis perpendicular to that of 4 face, the studs on the mandrel carriage having through threaded passages, and threaded adjustment bolts swiveled in the swivel studs of the sine bar and threaded through the threaded pas- 5 sages of the swivel studs of the carriage.

axis perpendicular to the long axis of its true LAWRENCE MCDOWELL.

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

UNITED STATES PATENTS Number Name Date 1,683,509 Wescott Sept. 4, 1928 uesses Boos June 24, 1930 1,931,730 Klay Oct. 24, I933 2,39 i, -1 2 1 Silvermaster Apr. 9, 1946 2,446,562 'Irobojevich Aug. 10. 1948

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