US645463A - Mechanical movement. - Google Patents

Description

No. 645,463. Patented Mar. I3, I900.

J. K. E. DIFFENDERFFEB.

MECHANICAL MOVEMENT.

(Application filed Aug. 31, 1899.)

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("0 Model.)

No. 645,463. Patented Mar. l3, I900. J. K. E. DIFFENDERFFER.

IVIEIEHANIGAL MOVEMENT.-

(Application filed Aug. 31, 1899.)

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(No Model.)

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NITED STATES JOHN K. E. DIFFENDERFFER, OF BALTIMORE, MARYLAND.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent l q o. 645,463, dated March 13, 1900.

Application filed August 31 1399. Serial No. 729,020. (No model.)

To all whom it may concern:

Be it known that I, JOHN K.E. DIFFENDERF- FER, of the city of Baltimore, in the State of Maryland, have invented certain Improvements in Mechanical Movements, of which the following is a specification.

This invention relates to certain improvements in that class of mechanical movements in which the rotation of one shaft is communicated to another at a right angle thereto through the medium of screw-gearing, as will hereinafter fully appear.

In the further description of the said invention which follows reference is made to the accompanying drawings, forming a part hereof, and in which- Figure 1 is a partly-sectional View of the improved mechanical movement with the driven shaft shown in a horizontal position and in full. Fig. 2 is a partly-sectional view of the mechanical movement looking from the upper end of the driven shaft. Fig. 3 is an exterior view of parts of Fig. 2. Fig. 4 is an exterior view of Fig. 2, illustrating a modifioation in the arrangement of certain parts of the apparatus, as hereinafter described.

Referring now to Figs. 1, 2, and 3 of the drawings, A is the driven shaft, having secured thereto an ordinary worm-Wheel B.

C and D are worms in gear with the wormwheel B. The said worms are placed diametrically opposite to each other, and their shafts a and b are provided with spur gear-Wheels E and F, the teeth of which are in mesh, so that the rotation of one worm will effect the rotation of the other, but in the reverse di rection. The worm-shaft ct is the driver, and motion is communicated thereto through the agency of the universal joint or coupling G; but the present invention does not extend beyond the driving-shaft a.

H is a casing of any appropriate construction, which incloses the gearing described, and it is provided with the lug 0, adapted to be fastened to any stationary object to prevent the worms revolving about the wormwheel instead of effecting the rotation of the latter.

The worm-shafts are provided with hollowfaced collars cl, and the openings in the body portion of the casing H, through which the worm-shafts extend, with corresponding collars e, and between the collars of the shafts and those in the casing are placed balls f to form ball-bearings for the shafts.

To prevent all the work being done by one of the worms and to equalize the strain and friction on both worms, the holes h in the casing, through which the driven shaft passes, are elongated. (See Fig. 2, in which the said elongated holes are shown in dotted lines.) With this construction and arrangement the driven shaft slides slightly in its bearings and automatically adj usts-itself, so that the threads of the two worms bear with'a common strain against the teeth of the WO1II1-'- wheel.

In Fig. 4 the driven shaft A passes through bearing-boxes I, only one of which is shown, the other being underneath the casing, which are attached to the casing by means of bolts The holes j in the bearing-boxes through which the bolts '5 pass are elongated to admit of the adjustment of the Worms with reference to the worm-wheel,as before described.

From the foregoing description it will be understood that the worm-wheel being driven from opposite sides is held in a central position independently of the bearings of the shaft, and in consequence friction in the bearings is much reduced.

I claim as my invention- 1. In combination with two worms carrying gear-wheels which are in mesh with each other'so that the worms will rotate in opposite directions, a shaft having thereon a wormwheel the teeth of which are in mesh with the threads of the worms,the said worm-wheel ,a worm-wheel the teeth of which are in mesh with the threads of the worms, a driven shaft which is tight in the said worm-Wheel, and bearings for the said shaft which are elongated so that the said shaft and worm-wheel will have some self-adjustment and thereby wheel shaft passes to admit of the self-adjustment of the worms with reference to the said worm-wheel in order that the threads of the said worms may bear equally against the teeth of the Worm -Wheel, substantially as specified. V

JOHN K. EFDIFFENDERFFER.

Witnesses:

WM. T. HOWARD, HARRY E. FEE.

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