US1296607A - Dynamic balancing-machine. - Google Patents

Description

N. W. AKIMOFF.

DYNAMIC BALANCING MACHINE. APPLICATION FILED MAR. 31, 1916. RENEWED JULY 6, I918.

1,296,607. Patented Mar. 11, 1919.

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wane/000a v gnvamtoz mm 01w zJ/mmy UNITED STATES PATENT OFFICE.

- NICHOLAS W. AKIMOFF, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 DYNAMIC BALANCING MACHINE COMPANY, OF PHILADELPHIA,

PENNSYLVANIA.

DYNAMIC BALANCING-MACHINE.

Patented Mar. 11, 1919.

Application filed March 31, 1916, Serial No. 87,926. Itenewed July 6, 1918. Serial No. 243,699.

1 0 all 'iuhom it may concern Be it known that I, NICHOLAS \V. AKI- MOFF, a subject of the Czar of Russia, and a resident of the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Dynamic Balancing-Machines, of which the following is a full, clear, and exact disclosure.

The object of the invention is to provide a simple apparatus automatically operative to positively indicate the absence of dynamic balance in a rotatable body of any sort, but with particular adaptability to such objects as fly-wheels, pulleys, etc., having relatively less axial extent than diametrical measurement.

Another object is to provide a device of this character whereby elements of the same forming a mechanical couple are so shifted, while the said device is in motion, as to move an axis of the momental ellipsoid of inertia of a body being tested into coincidence with the axis of rotation of the said body.

Still another object is to provide a con struction, wherein the disturbing couple of a dynamically unbalanced body is neutralized by a set of mechanically adjustable elements forming a second couple, while the system comprising said body and said elements is in rotation. v

And a still further object is to provide means for directly indicating the relative position and numerical value or equivalent of the disturbing couple within said unbalanced body.

(This invention and application comprise a further step in the development ofdynamic balancmg apparatus considered also in copending applications, Serial Nos. 32,296, 36,573 and 59,659.)

Further details as to the preferred construction and operation of the invention are fully brought out in the following descrip- 1 tion in conjunction with the accompanying drawing inwhich one embodiment of the invention is shown in elevation with parts thereof in section.

Referring to the drawing, a base 1 is shown upon which is mounted a table 2, pivotally supported by one or more members 3, each resting upon a point or knifeedge 4 and adapted tov oscillate in a vertical.

plane, the saidtable being further supported by one or more resilient members 5 having predetermined natural periods of vibration under given loads.

Centrally the table 2 is provided with a recess 6 preferably lined with a bearing 7 and in alinement with which is a centrally apertured bushing 8, supported by and'at the point of convergence of a suitable num- 1 and is operative-to revolve in conformity therewith by virtue of a suitably secured key 16.; The peripheral portion of the hub 17 of said last-named disk is provided with a continuous groove 18 into which slidably extends one or more pins 19 from the yoke portion of a lever 20, pivotally supported at 21 upon on integral extension 22 of the brackets 9, and at its opposite end provided with a handle for the purpose of manually operating the said lever and in turn the disk 15, the extent of the movement of said lever and disk being indicated upon the graduated segment 23, or other suitable means.

Fixed to the other side of the disk 12 and adjacent to the periphery thereof is a suitable weight 25, while diametrically opposite therefrom and at an equal distance from the center of rotation is a second weight 26 secured upon the upper side of the disk 15. This pair of weights creates a mechanical couple, and as the lever 20 is actuated during the rapid rotation of the device the ellipsoid of inertia of the mechanism is shifted with respect to the axis of rotation as the weight 26 is moved vertically,.thereby altering its angular relation with respect to the weight 25. y I

The body to be balanced, such for instanc as the pulley 30, is secured centrally upon the disk 12, preferably by means of a bolt or the like 31, an intermediate rest or bearing 32 being interposed when necessary between said body and said disk. Said body and supporting mechanism are then set into rotation by the electric or other motor 35, or similar driving mechanism through the upon the said body creating a disturbing mechanical couple, is neutralized by raising or lowering the lever, thus shifting the lower disk and weight secured thereto, which with the weight upon the upper disk creates a Second couple. Now, if the diametrical line passing through the controlling elements of said second couple is at the beguiningin a plane angularly parallel with the said disturbing couple,-the effect of the latter'will be neutralized and the numerical value of the same indicated upon the graduated segment, after which additions to, or subtractlons from, selected portions of the unbalanced body can be readily made to perfectly balance the same dynamically. If, however, the

desired result is not fully attained by the adjustment-described, the mechanism is stopped and thebody being testedis shifted axially upon its supporting disk as much or as many times as may be found necessary, until the cause of the unbalanced condition of the body as evidenced by the vibrations of the device is fully neutralized.

4 Having thus described my invention, what. I claim and desire to protect by Letters Patent of the United States is 1. A dynamic balancing machine, comprising a pair of dlsksrotatable upon a common axis, one being axially movable with respect to the other, means to revolve said disks synchronously, and equal weights secured to the respective disks and creatinga couple adaptw ed to neutralize the disturbing couple in a body rotatably supported by said machine.

2. A dynamic balancing machine, comprising apair of disks rotatable upon a common axis and one movable axially with respect to theother, means to revolve said disks synchronously, and equal weights secured to Y diametrically opposite positions upon said disks, and creating a couple adapted to neutralize the disturbing couple'in a body rotatably supported by said machine.

3. A dynamic balancing machine, compris- I ing a shaft, a disk carried by said shaftand adapted to support a body to be tested, a second disk longitudinally adjustable upon said shaft but revoluble therewith, and equal weightssecured to said disks to create a mechanical couple adapted to neutralize the disturbing co pl of said body.

4. A dynamic balancing machine, comprising a shaft, ad-isk carried by said shaft and adapted to support a body to be tested,

-a second disk longitudinally adjustable upon said shaft but revoluble therewith, equal weights secured to the diametrically opposite sides of said disks to create a mechanical couple adapted to neutralize the disturbing couple of said body, and means to adjust the respective positions of said weights while'the system comprising said disks. and said body are rotating.

5. A dynamic balancing machine, comprising a support for a body to be tested, a pair of equal weights revoluble about a common axis, said axis lying in the same plane with the axis of said support, means connecting said weights and said support and operative to revolve them synchronously, the plane of.

movement-of one of said weights being fixed,

and means to move the plane of movement of the other of said weights into and out of coincidence with the said first plane.

6. A dynamic balancing machine, comprising a sup-port for a body to be tested, a pair of equal weights revoluble about a common axis, said axis lying in the same plane with the axis of rotation of said support, means connecting said weights and said support and operative to revolve them synchronously, the plane of movment of one of said weights being fixed, and means to shift the plane of movement of the other of said weights into and out ofcoincidence with the said first plane, while the system formed by the weights and body is rotating.

7. A dynamic balancing machine, comprising a sup-port for a body to be tested, a pair of disks revoluble upon coincident axes and axially movable with respect to each other, each disk being provided with a weight diametrically disposed with respect to the weight of the other, and means connecting said: disks and operative to revolve them synchronously with said support.

8. A dynamic balancing machine, comprising a support for a body to be tested, a pair of disks revoluble upon coincident axes and

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